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The construction and optimization of microbial cell factories are crucial steps and key technologies in achieving green biomanufacturing. As concern has been aroused regarding the excessive carbon dioxide (CO 2 ) emissions and food security, a new and promising research field, microbial conversion of CO 2 into food compounds, has emerged. The research in this field not only holds significant implications for achieving the carbon peaking and carbon neutrality goals but also plays a role in maintaining food security. This paper provides a comprehensive review and outlook of the research on utilizing CO 2 and its derived low-carbon chemicals for the production of food compounds, focusing on the production of glucose, sugar derivatives, and single-cell proteins and the development of artificial CO 2 fixation pathways.

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Copyright of Coal Science & Technology (0253-2336) is the property of Coal Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Food & Machinery is the property of Food & Machinery Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Acta Materiae Compositae Sinica is the property of Acta Materiea Compositae Sinica Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

To eliminate the interference of calcium phosphate on the determination of calcium carbonate in reconstituted tobacco and to develop an accurate method for determining the mass percentage of calcium carbonate, CO2 was applied to react with calcium carbonate in reconstituted tobacco samples to form water-soluble calcium bicarbonate. Following the treatment, the variation of calcium ion concentration after CO2 treatment was determined by ion chromatography to analyze the mass percentage of calcium carbonate. The feasibility of the method was verified based on the repeatability, recovery, limit of detection (LOD), and limit of quantification (LOQ) . The results showed that: 1) Calcium carbonate could be separated from calcium phosphate by CO2 treatment, and the mass percentage of calcium carbonate in the reconstituted tobacco samples could be accurately determined using three different pretreatment methods. 2) This method showed better repeatability and recovery with a relative standard deviation(RSD, n=5) of 2.69% and recoveries in the range of 95%-102%. The LOD and LOQ were 0.12% and 0.39%, respectively. 3) The variation of the mass percentage of calcium carbonate in different reconstituted tobacco samples was large and varied from 2% to 4% in five reconstituted tobacco samples. In conclusion, this method was convenient, rapid, and suitable for accurate determination of the mass percentage of calcium carbonate in reconstituted tobacco and other complex calcium salt reconstituted tobacco systems. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Remote Sensing is the property of Editorial Office of Journal of Remote Sensing & Science Publishing Co. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of University Chemistry is the property of Peking University, College of Chemistry & Molecular Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of South China University of Technology (Natural Science Edition) is the property of South China University of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Bulletin of the Chinese Ceramic Society is the property of Bulletin of the Chinese Ceramic Society Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

At present, the death cases of simple asphyxiant gas acute poisoning are increasing sharply. Common asphyxiant gases in death cases include nitrogen, helium, carbon dioxide, methane, propane, laughing gas, etc. Simple asphyxiant gas has no affinity for biological matrices and escapes quickly, which puts forward new requirements for autopsy procedures, selection and collection of samples, laboratory analysis and identification. This paper reviews the research and development process of death cases caused by simple asphyxiant gas acute poisoning and put forwards the collection and analysis strategy of the samples in such cases. The most valuable biological samples in such cases should be lung tissues associated with the airways, followed by brain tissue and cardiac blood. Gaseous samples from the esophageal cavity, tracheal cavity, pulmonary bronchi, gastric and cardiac areas are also recommended as valuable samples. In the case of postmortem examination, the gas should be injected into gas sample bag directly. Biological materials such as tissue and blood should be directly sealed in head-space vials and analyzed by using the headspace gas chromatography-mass spectrometry.

In this paper, the effect of introducting different concentration CO2 into reaction gas on the internal stress of single crystal diamond grown by microwave plasma chemical vapor deposition (MPCVD) homogeneous epitaxy was studied, and its mechanism was analyzed. Results show that with the increase of CO2 concentration, the internal stress of single crystal diamond decreases gradually. This is because the added CO2 provides oxygen containing groups, which can effectively etch the non-diamond carbon in the diamond growth process, and reduce the content of impurities in the diamond, so as to avoid lattice distortion and reduce growth defects. This ultimately shows the reduction of the internal stress of single crystal diamond, which is in the form of compressive stress. Besides, the addition of CO2 in reaction gas can reduce the growth rate and deposition temperature of single crystal diamond, and single crystal diamond with less impurities and high crystallinity can be obtained at a suitable carbon hydrogen oxygen atomic ratio (5:112:4). [ABSTRACT FROM AUTHOR]

A high-precision human metabolic measurement system is designed. The system uses STM32F103 as the main control chip to acquire oxygen, carbon dioxide and flow signals to calculate four quantitative indicators: oxygen consumption( V ), carbon dioxide production( O 2 ), carbon dioxide production( V CO 2 ), and finally uses an upper computer to display the calculation results.In this paper, the signal acquisition circuit design was carried out for the oxygen sensor, carbon dioxide sensor and flow sensor, and the validity of the device was verified with the American machine MGCDiagnositcs using Bland-Altman analysis method, and the results showed that the four parameters of RQ ) and resting energy metabolism( REE ), and finally uses an upper computer to display the calculation results.In this paper, the signal acquisition circuit design was carried out for the oxygen sensor, carbon dioxide sensor and flow sensor, and the validity of the device was verified with the American machine MGCDiagnositcs using Bland-Altman analysis method, and the results showed that the four parameters of V O 2 , V CO 2 , RQ and REE of both devices fell in the agreement interval of more than 95%. The device thus provides accurate metabolic measurements and offers an effective tool for the field of general health and clinical nutrition support in China.

Copyright of Experimental Technology & Management is the property of Experimental Technology & Management Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Advances in New & Renewable Energy is the property of Editorial Office of Advances in New & Renewable Energy and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Natural Gas Industry is the property of Natural Gas Industry Journal Agency and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

With the rapid progress of seawater desalination technology, concentrated brine has not been effectively used due to the lack of mature development and treatment process. Direct emissions of concentrated brine are seriously harmful to the ecological environment. At the same time, massive emissions of carbon dioxide have exacerbated the greenhouse effect. Aiming at the resource utilization of concentrated brine and carbon dioxide, combined with the previous research basis of using calcium hydroxide as the precipitant to prepare magnesium hydroxide, this paper proposes a carbonization technical process to prepare magnesium bicarbonate using magnesium hydroxide as the precursor from low magnesium systems. The research focused on the carbonization process of magnesium hydroxide, investigating the influence of liquid-solid ratio, temperature, carbon dioxide gas velocity, stirring speed, and raw material difference on the carbonization process, and monitoring the change of calcium and magnesium ion concentration and pH value during the carbonization process. It was found that under room temperature and atmospheric pressure, the carbonization effect was the best when the liquid-solid ratio was 40, the carbon dioxide gas velocity was 400 mL/min, and the stirring speed was 300 r/min, the concentration of Mg2+ in the carbonization solution from magnesium hydroxide (AR) was 0.315 mol/L and there existed no Ca2+, the concentration of Mg2+ in the carbonization solution from self-made magnesium hydroxide was 0.203 mol/L, the concentration of Ca2+ was 3.2 x 10-4 mol/L, calcium impurities were basically separated. The particle size and dispersion of magnesium hydroxide had a significant impact on the carbonization effect, smaller particle size and better dispersion promoted the carbonization process. The shrinking core model of magnesium hydroxide was briefly discussed at the same time, the fits of the carbonization process at different slurry temperatures showed good linearity. [ABSTRACT FROM AUTHOR]

Objective: A trans-critical CO2 refrigeration system with ejector is proposed and its performance factors are studied. Methods: In this paper, energy and exergic system model combined with experiment method were used to study the impact of the change of major parameters on traditional and new refrigeration systems. Results: In a given working condition, exergy efficiency of the compressor increased by 11.08% when an injector replaced the throttle valve, while the power of the compressor decreased by 6.04% and the performance factor increased by 11.1%. The optimum gas cooler pressure was found to maximize the system performance. In addition, the exergic damage of the system components was optimized in this paper. Conclusion: The ejector of the new system has great potential for optimization, and the outlet temperature of the gas cooler has the greatest influence on the performance of the ejector.

The greenhouse effect caused by CO2 is a global problem and CO2 capture technologies can effectively reduce greenhouse gas emissions. Among various CO2 capture technologies, adsorption has been widely used due to its simple process, high efficiency and low regeneration energy consumption. In recent years, the synthesis and development of porous materials with certain pore structure and high adsorption performance has become a hot topic in CO2 adsorption research. Porous organic polymers (POPs) are an emerging porous material with good structure, large specific surface area, excellent physicochemical properties and good adsorption selectivity making them one of the more cutting-edge adsorbent materials in the field of CO2 adsorption and showing great potential in the field of CO2 adsorption. In this paper, the classification, structural characteristics and the latest progress in the field of CO2 adsorption of POPs are briefly introduced, including hypercrosslinked polymers, conjugated microporous polymers, covalent organic frameworks and porous aromatic frameworks. At the same time, the shortcomings and complex synthesis conditions of different types of POPs are analyzed. Finally, it is proposed that expanding its application scenarios and developing new synthesis paths are the prospects for future development. [ABSTRACT FROM AUTHOR]

Copyright of China Plastics / Zhongguo Suliao is the property of Journal Office of CHINA PLASTICS and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Atomic Energy Science & Technology is the property of Editorial Board of Atomic Energy Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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Copyright of Acta Materiae Compositae Sinica is the property of Acta Materiea Compositae Sinica Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The problem of global warming caused by the rapid growth of carbon emissions has attracted more and more attention in all countries, so it is of great importance to develop feasible CO2 capture materials. In this paper, kaolinite is used as raw material, to prepare mesoporous silica carrier (KNH) with the method of calcination-alkali activation-acid etching. Then the pentaethylenehexaamine ( PEHA) functionalized mesoporous silica ( KNH-PEHA) was synthesized via impregnation. The prepared samples were characterized by X-ray diffraction (XRD), Fourier transformation infrared spectroscopy ( FT-IR), scanning electron microscopy ( SEM), and N2 adsorption-desorption isotherms treated by BET ( Brunauer-Emmett-Teller) analysis. And the solid adsorbent is also used to study the adsorption property of carbon dioxide (CO2 ). The results indicate that the structure of PEHA-loaded KNH is not changed, but its carbon dioxide adsorption capacity is improved. When the adsorption temperature is 25 °C, the CO2 adsorption capacity of KNH is 147. 39 cm³/ g, and the CO2 adsorption capacity of KNH (KNH-P-30) with a mass percentage of PEHA of 30% reaches 389 cm³/ g, which is much higher than that without PEHA modified KNH adsorption. At the same time, it express the adsorption mechanism of the solid adsorbent for CO2, which provides a new idea for the application of kaolinite in the field of gas adsorption. [ABSTRACT FROM AUTHOR]

Ferromagnesian minerals can react with CO2 under natural conditions to form stable carbonate minerals, which is a safe, economical, and sustainable way of carbon capture and storage. This paper introduces the carbon fixation mechanism of ferromagnesian minerals and analyzes their carbon fixation capacity and potential based on the large reserves of ferromagnesian tailings from the Suoluogou Gold Mine in Sichuan, where the proportion of CaO, MgO, FeO and other components that can fixate CO2 is high. It is estimated that the current carbon storage capacity of the Suoluogou tailings is as high as 1. 64 million tons, and the average annual CO2 storage capacity in the future is estimated to be about 120 000 t based on the current production efficiency. At least 2. 46 million tons of CO2 can be stored for the future production of tailings. Referring to the ERW method, ferromagnesian minerals can be further separated from the Suoluogou tailings and sprayed on farmland for natural weathering and consumption of CO2, which will greatly reduce the cost of CO2 storage by promoting comprehensive utilization of tailings. [ABSTRACT FROM AUTHOR]

Copyright of China Surfactant Detergent & Cosmetics is the property of China Surfactant Detergent & Cosmetics Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Shipin Kexue/ Food Science is the property of Food Science Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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Copyright of China Brewing is the property of China Brewing Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

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【Objective】The paper aimed to study the effects of different dilution ratios of carbon dioxide trapping agent on CO2 concentration in ‘Murcott’ tangerine canopy and physiological characteristics of leaves, and to provide theoretical basis and data support for the application of carbon dioxide trapping agent in citrus production practice.【Method】In the study, six-year-old trifoliate orange rootstock ‘Murcott’ tangerine was used as test material, and the leaves were sprayed with 1∶100, 1∶150, 1∶200 dilution ratio carbon dioxide trapping agent, and the same amount of water was applied as the control. The change characteristics of CO2 concentration in citrus canopy were investigated, and the leaf morphological characters, chlorophyll content, photosynthetic characteristics and non-structural carbohydrate were measured. 【Result】Compared with CK, the CO2 concentration in the three dilution ratios of carbon dioxide trapping agent increased significantly（P<0.05）, and increased by 1.63%（treatment T1）, 1.94%（treatment T2） and 1.78%（treatment T3）, respectively. The Chla and Chl（a+b） contents in T2 and T3 treatments increased significantly compared with CK on 2 June（P<0.05）. The peak values of T1 treatment were leaf width, louver fresh weight, Pn daily mean, Tr daily mean, Fo, Fm, Fv/Fm and Fv/Fo, among which Pn daily mean, Fo, Fm, Fv/Fm and Fv/Fo showed significant differences compared with CK（P<0.05）;T3 treatment showed peak values in Gs daily mean, Ci daily mean, leaf length, length-width ratio, leaf area and leaf dry weight, only leaf length and leaf dry weight were significantly different from CK（P<0.05）. Soluble sugar content was decreased and starch content was increased in the three groups treated with carbon dioxide trapping agent. On May 13, Soluble sugar and starch contents of T3 treatment were significantly different from those of CK（P<0.05）. 【Conclusion】Carbon dioxide trapping agent could increase the concentration of CO2 in the canopy of ‘Murcott’ tangerine, producing a positive response to the physiological characteristics of leaves, increasing the accumulation of biomass and chlorophyll in leaves, effectively alleviated the ‘nap’ phenomenon of ‘Murcott’ tangerine, and changed the ratio of photosynthetic products. Different dilution ratio of carbon dioxide trapping agent had different response to physiological characteristics of ‘Murcott’ tangerine leaves. [ABSTRACT FROM AUTHOR]

Copyright of Mining & Metallurgy (10057854) is the property of Beijing Research Institute of Mining & Metallurgy Technology Group and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of China Plastics / Zhongguo Suliao is the property of Journal Office of CHINA PLASTICS and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

【Objective】The present paper aimed to understand the difference of drought resistance among hybrid soybean varieties, thus to select drought tolerant hybrid soybean varieties.【Method】3 hybrid soybean varieties were used as experimental materials and different concentrations of PEG-6000 solution (5%,10% and 20%) hydroponic model were used to simulate drought stress in soybean seedling stage. To identify the physiological response and drought resistance of 3 hybrid soybeans, chlorophyll content, photosynthetic physiological index, osmotic regulator content and antioxidant enzyme activity of leaves in seedling stage were measured after drought stress. 【Result】With the increasing concentration of PEG-6000 solution, there were significant differences in the related drought resistance indicators of the three hybrid soybeans and the growth of soybean seedlings was gradually significantly inhibited. The chlorophyll content of soybean seedlings was detected, and it was found that with the increase of PEG-6000 solution concentration, its content showed an upward trend, the most significant being dominant Hybrid soybean-A-5. In terms of photosynthetic physiological indexes of soybean seedlings, the variation trends of net photosynthetic rate (Pn), transpiration rate (Tr), intercellular carbon dioxide concentration (Ci) and stomatal conductance (Gs) of leaves of three hybrid soybean seedlings showed significant differences. The response of different soybean varieties to drought stress under different treatment conditions was analyzed. The results showed that soybean seedlings could respond to drought stress through osmoregulation and activating antioxidant defense system was analyzed.The content of each substance changed significantly with the increase of stress degree. There were also significant differences among different varieties. The order of drought resistance of 3 hybrid soybeans was obtained by comprehensive analysis of membership function value method, Hybrid soybean-A-5> Hybrid soybean No.6>Jindou 48.【Conclusion】 The photosynthesis inhibition, osmotic adjustment and antioxidant enzyme activities could respond to drought stress of 3 hybrid soybeans. The Hybrid soybean-A-5 can be used as a demonstration of drought resistant hybrid soybean to promotion and demonstration in Huanghuaihai Area. It also provides an important reference for drought resistant breeding of hybrid soybean in later stage. [ABSTRACT FROM AUTHOR]

Objective The oil - increasing effect of in-situ carbon dioxide foam was gradually weakened in multicycle profile control. It was urgent to analyze the decreasing law of the system. Methods The paper studied the law of in-situ carbon dioxide foam profile control with multiple rounds by using large scale visual plate physical model and numerical simulation model which combined with the characteristics of vertical heterogeneity in Bohai oil field reservoir. And an attempt was made to extend the reaction time of the system to increase its action distance. Results The research showed that water flooding could only sweep the high permeability layer in the lower part of the reservoir, but it could not sweep the low permeability layer in t he upper part. The in-situ carbon dioxide foam profile control system could entered the high permeability layer to form plugging and started the low permeability layer, which improved oil recovery more than 10 % in t he first cycle of profile control. But the system could not enter the deeper location with the profile control rounds increased. The enhanced oil recovery value constantly decreased, which was less than 1% by the fourth cycle of profile control. The remaining oil of the high permeability layer was mainly distributed in the two wings and the remaining oil of the low permeability layer was evenly distributed. Conclusions The effective distance of in-situ carbon dioxide foam system was short which was failed to work in deeper reservoir with the profile control rounds increased. T he effect of multicycle profile control was better by prolonging the reaction time to increase its effective distance, which increased the total enhanced oil recovery value by :3. 66%. [ABSTRACT FROM AUTHOR]

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Copyright of Tourism Tribune / Lvyou Xuekan is the property of Tourism Institute of Beijing Union University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Tourism Tribune / Lvyou Xuekan is the property of Tourism Institute of Beijing Union University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The problems of poor permeability and low replacement efficiency are faced during the mining of natural gas hydrates by CO2 replacement. In this paper, based on the molecular dynamics simulation method, NH2 which has strong penetrating ability to hydrate phase, is used as a promoter to simulate the replacement of hydrate by CO2, single component and CO2 NH2, mixed components, respectively. The results show that within the range of temperature and pressure set by simulation, NH2, plays a positive role in promoting the CO2 replacement hydrate process at 245 K and 255 K, and it will inhibit the replacement process when the temperature rises to 265 K, at the same temperature, the increase of pressure will improve the displacement efficiency, but it will not change the promotion/inhibition effect of NH2 on the replacement process. The results can provide new ideas for improving the replacement efficiency of CO2 replacement method. [ABSTRACT FROM AUTHOR]

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Burning fossil fuels is an effective way to obtain energy at present, but the emitted carbon dioxide has seriously affected the earth’s ecological environment. Meanwhile, CO2 itself is a low toxicity, nonflammable, abundant and cheap carbon resource. The resource utilization of CO2 through chemical methods not only provides some useful ideas for the fixation of CO2, but also obtains some high value-added products. Among them, the direct carboxylation of CO2 has attracted much attention because of its advantages in the step economy and the atom economy. The commonly used catalysts in such reactions include metal complexes, Lewis acids and bases, while most of the metal complexes face complex synthesis steps and high price. Aromatics and heterocyclic compounds are important products of coal chemical industry. Expanding the downstream utilization of coal-based chemicals is an important way to promote the transformation and upgrading of coal chemical industry. Aromatic acid is a kind of very important chemical products. At present, the production process of most aromatic acids involves multi-step reaction, with low atomic utilization and high cost. This paper reviews the research progress in the synthesis of aromatic acids catalyzed over Lewis acid or base, using coal-based aromatic compounds as substrates and cheap and easily available CO2 as carboxylation raw materials. Compared with the traditional synthesis method of aromatic acid, the CO2 carboxylation method is a green and economic synthesis method with short reaction process, low cost, high product selectivity and yield. Taking coal-based aromatic compounds as raw materials, the technology of preparing aromatic acids by carboxylation with CO2 has broad development prospects. Through comparison, the supported carbonate catalyst has good safety and stability, and can be regenerated, but the yield and selectivity of the target compound are low. In the subsequent development, the performance and safety of the catalyst need to be continuously improved for promoting the application of the reaction in a large-scale industrial production.

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Carbon dioxide capture, EOR-utilization and storage (CCUS-EOR) are the most practical and feasible large-scale carbon reduction technologies, and also the key technologies to greatly improve the recovery of low-permeability oil fields. This paper sorts out the main course of CCUS-EOR technological development abroad and its industrialization progress. The progress of CCUS-EOR technological research and field tests in China are summarized, the development status, problems and challenges of the entire industry chain of CO2 capture, transportation, oil displacement, and storage are analyzed. The results show a huge potential of the large-scale application of CCUS-EOR in China in terms of carbon emission reduction and oil production increase. At present, CCUS-EOR in China is in a critical stage of development, from field pilot tests to industrialization. Aiming at the feature of continental sedimentary oil and gas reservoirs in China, and giving full play to the advantages of the abundant reserves for CO2 flooding, huge underground storage space, surface infrastructure, and wide distribution of wellbore injection channels, by cooperating with carbon emission enterprises, critical technological research and demonstration project construction should be accelerated, including the capture of low-concentration CO2 at low-cost and on large-scale, supercritical CO2 long-distance transportation, greatly enhancing oil recovery and storage rate, and CO2 large-scale and safe storage. CCUS-EOR theoretical and technical standard system should be constructed for the whole industrial chain to support and promote the industrial scale application, leading the rapid and profitable development of CCUS-EOR emerging industrial chain with innovation.