17 results on '"Tongyang Song"'
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2. Sorbitol-derived carbon overlayers encapsulated Cu nanoparticles on SiO2: Stable and efficient for the continuous hydrogenation of ethylene carbonate
- Author
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Tongyang Song, Yuanyuan Qi, Chen Zhao, Peng Wu, and Xiaohong Li
- Subjects
Nanoparticles ,nanotechnology fabrication ,nanomaterials ,Science - Abstract
Summary: An ultrastable and efficient Cu@C/SiO2 nanocatalyst was fabricated for the hydrogenation of ethylene carbonate, in which Cu nanoparticles are encapsulated by sorbitol-derived graphitized carbon overlayers. During the calcination of Cu-sorbitol/SiO2 precursors under N2 atmosphere, sorbitol decomposed to CO and CO2. The in situ generated CO not only reduced Cu2+ to Cu0/Cu+, but also formed graphitized carbon overlayers on the Cu surface via the disproportionation of CO. The Cu@C/SiO2 catalyst exhibited superior catalytic performance (91% MeOH yield and 43.6 h−1 TOF) at a H2/EC molar ratio of 20. Of particular note, the Cu@C/SiO2 catalyst showed remarkable long-term stability during 736 h time-on-stream test without any deactivation. The graphitized carbon overlayers on the surface of Cu nanoparticles not only functioned synergistically with the surface Cu0/Cu+ sites to promote the EC hydrogenation but also suppressed the sintering of Cu nanoparticles. Furthermore, the interaction of Cu nanoparticles and graphitized carbon overlayers stabilized the surface Cu+/(Cu0+Cu+) ratio.
- Published
- 2022
- Full Text
- View/download PDF
3. The Roles of Precursor-Induced Metal–Support Interaction on the Selective Hydrogenation of Crotonaldehyde over Ir/TiO2 Catalysts
- Author
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Aiping Jia, Hantao Peng, Yunshang Zhang, Tongyang Song, Yanwen Ye, Mengfei Luo, Jiqing Lu, and Weixin Huang
- Subjects
crotonaldehyde ,hydrogenation ,Ir/TiO2 ,iridium precursor ,reaction mechanism ,Chemical technology ,TP1-1185 ,Chemistry ,QD1-999 - Abstract
Various supported Ir/TiO2 catalysts were prepared using different Ir precursors (i.e., H2IrCl6, (NH4)2IrCl6 and Ir(acac)3) and tested for vapor phase selective hydrogenation of crotonaldehyde. The choice of Ir precursor significantly altered the Ir-TiOx interaction in the catalyst, which thus had essential influences on the geometric and electronic properties of the Ir species, reducibility, and surface acidity, and, consequently, their reaction behaviors. The Ir/TiO2-N catalyst using (NH4)2IrCl6 as the precursor gave the highest initial reaction rates and turnover frequencies of crotyl alcohol formation. Such high performance was ascribed to the high Ir dispersion and high surface concentration of Ir0 species, as well as a higher surface acidity, in the Ir/TiO2-N catalyst compared to its counterparts, indicating the synergistic roles of the Ir-TiOx interface in the reaction, as the interfacial sites were responsible for the adsorption/activation of H2 and the C=O bond in the crotonaldehyde molecule.
- Published
- 2021
- Full Text
- View/download PDF
4. Efficient hydrogenation of cyclohexyl acetate to cyclohexanol with Cu-Zr catalysts.
- Author
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Kai Cui, Yuanyuan Qi, Tongyang Song, Peng Wu, and Xiaohong Li
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HYDROGENATION ,CATALYSTS ,ETHANOL ,ACETATES ,OXYGEN - Abstract
The hydrogenation of acetic acid-derived cyclohexyl acetate (CHA) is becoming a safe, efficient and promising route for the production of cyclohexanol (CHOL), an important chemical to produce e-caprolactam. In this work, Cu-Zr catalysts were prepared via different methods for the hydrogenation of CHA. The results showed that a Cu
3 Zr7 -SG catalyst prepared by the sol-gel (SG) method was superior to Cu3 Zr7 -CP and Cu3 Zr7 -IM catalysts prepared by the coprecipitation (CP) and impregnation (IM) method, respectively. The Cu3 Zr7 -SG catalyst showed 97.4% CHA conversion and 95.5% selectivity to CHOL along with 96.3% selectivity to ethanol at 250 1C under 3 MPa of H2 . Moreover, the Cu3 Zr7 -SG catalyst showed a mass specific activity of up to 29.8 gCHA gCu-1 h-1 , higher than other Cu-based catalysts under similar conditions. Based on detailed characterization studies, it was found that the larger weak acid sites, more weak and moderate basic sites, higher Cu+/(Cu0 + Cu+ ) and oxygen vacancies on the surface of the Cu3 Zr7 -SG catalyst were beneficial for the hydrogenation of CHA. [ABSTRACT FROM AUTHOR]- Published
- 2024
- Full Text
- View/download PDF
5. Synthesis of bio-derived 1,4-butanediol by succinic acid esterification and hydrogenation over CuFeAl catalysts
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Kefan Li, Jiaming Yang, Tongyang Song, Zhirong Zhu, Chen Zhao, Peng Wu, and Xiaohong Li
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Environmental Chemistry ,Pollution - Abstract
Synthesis of bio-derived 1,4-butanediol with a 91.2% yield was realized by succinic acid esterification with methanol over phosphotungstic acid, and then one-pot hydrogenation over a Cu1Fe1Al0.5 catalyst in a segmented temperature-controlled manner.
- Published
- 2023
6. Sn regulates the electronic structure and metal particles of Pd to improve the hydrogenation performance of 4-nitrophenol
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Lele Yan, Yuyao Wang, Lina Zhu, Junjie Chen, Yuyang Xu, Zijian Wang, Tongyang Song, Bo Zhao, Xianlang Chen, and Rongrong Li
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Materials Chemistry ,General Chemistry ,Catalysis - Abstract
The synergistic effect between Sn and Pd enhances the activity and stability of the PdSn4/C catalyst.
- Published
- 2023
7. The effects of TiO2 crystal-plane-dependent Ir-TiO interactions on the selective hydrogenation of crotonaldehyde over Ir/TiO2 catalysts
- Author
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Meng-Fei Luo, Yi-Ming Hu, Ji-Qing Lu, Wan-Bin Zheng, Ai-Ping Jia, Yunshang Zhang, Weixin Huang, and Tongyang Song
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Anatase ,Materials science ,02 engineering and technology ,General Medicine ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Photochemistry ,01 natural sciences ,0104 chemical sciences ,Catalysis ,Crystal ,chemistry.chemical_compound ,Adsorption ,Nanocrystal ,chemistry ,Molecule ,Crotonaldehyde ,0210 nano-technology ,Crystal plane - Abstract
Three supported Ir/TiO2 catalysts, containing anatase TiO2 nanocrystals with predominantly exposed {101}, {100}, and {001} planes, were subjected to various pre-treatments (H2 reduction at different temperatures and O2 re-oxidation) and then tested in the vapor phase selective hydrogenation of crotonaldehyde. The pre-treatments significantly altered the Ir-TiOx interactions, including the morphologies and electronic properties of the Ir species and their surface acidity. These interactions were also closely related to the crystal planes of TiO2, which further supported the observed reaction behaviors of the various Ir/TiO2 catalysts. The best performance was obtained using the Ir/TiO2-{101} catalyst pre-reduced at 300 °C, owing to its higher Ir0 surface concentration and moderate surface acidity compared to the other catalysts. Moreover, these findings indicated the synergistic role of the Ir-TiOx interface in the reaction, as the interfacial sites were responsible for the adsorption/activation of H2 and the C=O bond in the crotonaldehyde molecule. However, pre-reduction at 400 °C resulted in partial encapsulation of the Ir particles by TiOx via strong metal-support interactions, which is unfavorable for the catalytic reaction owing to the loss of Ir-TiOx interfacial sites.
- Published
- 2021
8. Continuous hydrogenation of CO2-derived ethylene carbonate to methanol and ethylene glycol at Cu-MoOx interface with a low H2/ester ratio
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Yuanyuan Qi, Ai-Ping Jia, Ji-Qing Lu, Peng Wu, Na Ta, Xiaohong Li, and Tongyang Song
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010405 organic chemistry ,Activation energy ,010402 general chemistry ,01 natural sciences ,Catalysis ,0104 chemical sciences ,chemistry.chemical_compound ,Adsorption ,chemistry ,Yield (chemistry) ,Methanol ,Physical and Theoretical Chemistry ,Selectivity ,Ethylene glycol ,Ethylene carbonate ,Nuclear chemistry - Abstract
The Cu-based catalysts have been widely employed in the hydrogenation of CO2-derived ethylene carbonate (EC) to methanol (MeOH) and ethylene glycol (EG), but still suffered from some problems such as excess hydrogen/ester ratio, unsatisfactory MeOH selectivity and catalyst stability & deactivation. Herein, a MoOx-promoted Cu/SiO2 catalyst, which was prepared via a one-pot modified hydrothermal method and derived from copper phyllosilicate precursors, exhibited superior catalytic performance (89% MeOH yield and 99% EG yield) and good stability (>150 h) at a H2/EC ratio (20). Remarkably, the turnover frequency (TOF) and space time yield of MeOH (STYMeOH) reached up to 17.5 h−1 and 0.207 g⋅gcat−1⋅h−1, respectively, which are among the highest values in the literature data. The characterization results and kinetic studies revealed that modification of Cu species by MoOx obviously changed the electronic properties of Cu species, reduced the activation energy and enhanced the Cu+/(Cu0 + Cu+) ratios. Such modification may lead to possible formation of Cu-O-Mo bond between Cu species and MoOx species located on the periphery of Cu-MoOx interface, which might strengthen the adsorption and activation of EC, stabilize the Cu nanoparticles, and thus improve the selectivity to MeOH and catalyst stability. In addition, MoOx decoration had obvious effect on the strength and quantity of the surface acid sites.
- Published
- 2021
9. Efficient Synthesis of Cyclohexanol and Ethanol via the Hydrogenation of Acetic Acid‐Derived Cyclohexyl Acetate with the Cu x Al 1 Mn 2−x Catalysts
- Author
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Yuanyuan Qi, Zhirong Zhu, Peng Wu, Tongyang Song, Xiaohong Li, and Wei Chen
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Inorganic Chemistry ,chemistry.chemical_compound ,Acetic acid ,Ethanol ,chemistry ,Organic Chemistry ,Cyclohexanol ,Organic chemistry ,Physical and Theoretical Chemistry ,Catalysis - Published
- 2021
10. Crystal-plane effects of anatase TiO2 on the selective hydrogenation of crotonaldehyde over Ir/TiO2 catalysts
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Cen Tang, Meng-Fei Luo, Ji-Qing Lu, Ai-Ping Jia, Wan-Bin Zheng, Zhenhua Zhang, Yi-Ming Hu, Yunshang Zhang, Tongyang Song, and Weixin Huang
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Anatase ,010405 organic chemistry ,Decarbonylation ,010402 general chemistry ,01 natural sciences ,Catalysis ,0104 chemical sciences ,Reaction rate ,chemistry.chemical_compound ,Adsorption ,chemistry ,Vacancy defect ,Physical chemistry ,Crotyl alcohol ,Physical and Theoretical Chemistry ,Crotonaldehyde - Abstract
Supported Ir/TiO2 catalysts with the anatase TiO2 nanocrystals exposing {1 0 1}, {1 0 0} and {0 0 1} planes were tested for selective hydrogenation of crotonaldehyde. The Ir/TiO2-{1 0 1} catalyst dominantly exposing {1 0 1} plane gave a initial reaction rate of 166.1 μmol gIr-1 s−1 at 80 °C and a turnover frequency of crotyl alcohol formation of 0.022 s−1, which is 5 and 7 times respectively higher than those obtained on the Ir/TiO2-{0 0 1} catalyst dominantly exposing {0 0 1} plane even though they have similar Ir particle sizes (ca. 1.3 nm). The reaction behaviors were related to the surface oxygen vacancy, which served as surface acid sites and provide adsorption sites for C O bond in the CRAL molecule. Therefore, the higher concentration of oxygen vacancy in the Ir/TiO2-{1 0 1} accounted for the improved performance compared to the Ir/TiO2-{0 0 1}. However, strong adsorption of crotonaldehyde and/or products on the catalyst surface, as well as the CO poisoning via decarbonylation of crotonaldehyde, were the main reasons for the catalyst deactivation.
- Published
- 2021
11. Synthesis of cyclohexanol and ethanol via the hydrogenation of cyclohexyl acetate with Cu2Znx/Al2O3 catalysts
- Author
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Xiaohong Li, Yuanyuan Qi, Peng Wu, Tongyang Song, Zhirong Zhu, and Kefan Li
- Subjects
Acetic acid ,chemistry.chemical_compound ,Ethanol ,chemistry ,Yield (chemistry) ,Batch reactor ,Cyclohexanol ,Cyclohexene ,Selectivity ,Catalysis ,Nuclear chemistry - Abstract
Cyclohexanol (CHOL), as a value-added chemical, has attracted much attention due to its huge application market. The hydrogenation of cyclohexyl acetate (CHA), derived from the esterification of acetic acid and cyclohexene, not only provides a novel route to yield CHOL and ethanol (EtOH), but also rationally utilizes excess acetic acid. In this work, a series of Zn-promoted Cu/Al2O3 catalysts were prepared via a deposition–precipitation method for the liquid-phase hydrogenation of CHA to yield CHOL and EtOH. As a result, the addition of Zn species with an optimal amount greatly improved the activity and selectivity to CHOL and EtOH. A Cu2Zn1.25/Al2O3 catalyst, which contained 16.2 wt% Cu and 9.6 wt% Zn, exhibited superior catalytic performance with 93.9% conversion of CHA and 97.2% selectivity to EtOH along with 97.1% selectivity to CHOL in a batch reactor. The Cu2Zn1.25/Al2O3 catalyst also showed excellent stability and there was no deactivation after five runs. Based on detailed characterization, it was revealed that the addition of Zn species increased the dispersion of Cu particles, adjusted the strength and amount of acid sites, and changed the electronic properties of Cu species and thus the ratio of Cu+/(Cu0 + Cu+).
- Published
- 2021
12. Size Effect of Spinel Co0.5fe0.5al2o4 Supported Pt Catalysts for the Selective Hydrogenation of Cinnamaldehyde
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Mengnan Li, Huiyue Xin, Tongyang Song, Chen Zhao, Peng Wu, and Xiaohong Li
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History ,Polymers and Plastics ,Business and International Management ,Industrial and Manufacturing Engineering - Published
- 2022
13. Efficient synthesis of methanol and ethylene glycol via the hydrogenation of CO2-derived ethylene carbonate on Cu/SiO2 catalysts with balanced Cu+–Cu0 sites
- Author
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Yuanyuan Qi, Wei Chen, Ji-Qing Lu, Peng Wu, Tongyang Song, and Xiaohong Li
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chemistry.chemical_compound ,Chemistry ,Yield (chemistry) ,Lewis acids and bases ,Methanol ,Selectivity ,Ethylene glycol ,Catalysis ,Ethylene carbonate ,Hydrothermal circulation ,Nuclear chemistry - Abstract
Achieving high catalytic performance with Cu-based catalysts is crucial for the hydrogenation of CO2-derived ethylene carbonate (EC) to simultaneously yield methanol (MeOH) and ethylene glycol (EG). Although Cu-based catalysts are widely studied for the target reaction, there are still some issues to be clarified. In this study, we prepared a 29.1 wt% Cu/SiO2-MHT catalyst by a modified hydrothermal method and successfully applied it to the hydrogenation of EC. In comparison with its three analogues having similar Cu loading and comparable Cu particle size but prepared by different methods, we found that the catalytic performance of the Cu/SiO2 catalysts, including the activity and the selectivity to MeOH, could be tuned by adjusting the Cu+/(Cu0 + Cu+) ratio via different preparation methods. As a result, the Cu/SiO2-MHT catalyst furnished 89% MeOH yield and 37.6 h−1 turnover frequency. To our best knowledge, these values are one of the highest among all heterogeneous Cu catalysts up to now. The results reveal that a cooperative effect exists between Cu0 and Cu+. When the Cu0 species are sufficient to activate H2, a more favorable formation of MeOH can be achieved with more Cu+ species and greater Cu+ surface areas. Furthermore, a greater amount of Lewis acid on the Cu/SiO2-MHT catalyst is also beneficial for MeOH formation.
- Published
- 2020
14. An efficient Cu-based catalyst for the hydrogenation of ethylene carbonate to ethylene glycol and methanol
- Author
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Wei Chen, Jingxia Tian, Peng Wu, Tongyang Song, and Xiaohong Li
- Subjects
010405 organic chemistry ,Sorption ,010402 general chemistry ,01 natural sciences ,Catalysis ,0104 chemical sciences ,chemistry.chemical_compound ,Ammonia ,chemistry ,Yield (chemistry) ,Methanol ,Selectivity ,Ethylene glycol ,Ethylene carbonate ,Nuclear chemistry - Abstract
Indirect CO2 conversion to ethylene glycol (EG) and methanol (ME) via CO2-derived ethylene carbonate (EC) as the intermediate is an attractive and promising approach. Cu-Based catalysts have been regarded as effective catalysts for the hydrogenation of EC to yield ME and EG. In this work, we prepared Cu/SiO2 catalysts through different methods for the hydrogenation of EC to yield ME and EG. The results show that Cu/SiO2-AE catalysts prepared by an ammonia evaporation (AE) method are superior to Cu/SiO2-DP catalysts prepared by a deposition–precipitation (DP) method. After modification using glucose with an optimal amount, the Cu8G1/SiO2-AE catalysts showed enhanced catalytic performance, furnishing 86% selectivity to ME and 99% selectivity to EG at almost full conversion of EC, with a TOF value for ME formation reaching about 39 h−1. A series of techniques such as N2 sorption, ICP-AES, FT-IR, H2-TPR, H2-TPD, TEM, and XPS were adopted to characterize the physicochemical properties of relevant catalysts. It was found that the Cu/SiO2-AE catalyst had a smaller Cu particle size. After modification with glucose, the Cu8G1/SiO2-AE catalyst had the smallest Cu particle size, the highest hydrogen adsorption ability, and the strongest interaction of Cu with SiO2 so that the highest Cu+/(Cu0 + Cu+) molar ratio was detected. In addition, upon investigation of catalyst stability and reusability, it was found that glucose modification for the Cu/SiO2-AE catalyst can also alleviate the deactivation distinctly.
- Published
- 2019
15. Optimal design of Bessel acoustic lens suitable for optical-resolution photoacoustic microscope with large depth of field
- Author
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Tongyang Song, Lingfang Song, Xianlin Song, Wenhao Xu, Jianshuang Wei, and Zouhua Chen
- Subjects
Materials science ,Microscope ,business.industry ,Physics::Medical Physics ,Physics::Optics ,Conical surface ,Laser ,law.invention ,Optics ,law ,Ultrasonic sensor ,Depth of field ,Prism ,Penetration depth ,business ,Zemax - Abstract
Photoacoustic tomography is a new medical imaging technology with the advantages of high resolution, high contrast and high penetration depth. There are three common photoacoustic imaging methods in practical applications: photoacoustic microscopic imaging (PAM), photoacoustic computed tomography (PACT), photoacoustic tomography (PAE). As an important branch of photoacoustic imaging, photoacoustic microscopy combines high contrast of optical imaging with high resolution of ultrasonic imaging. In photoacoustic microscopy, acousto-optic coupling prism is a very important component, which is usually composed of irregular prism and spherical concave acoustic lens at the bottom. Its function is to carry out optical transmission and ultrasonic detection. The ultrasonic depth of field of spherical concave acoustic lens is limited. In order to overcome this defect, researchers propose to use conical concave acoustic lens to produce Bessel sound beam to realize large depth of field ultrasonic detection. But the conical concave acoustic lens affects laser focusing and imaging. In order to solve this problem, we propose an optimization method to eliminate the influence of conical concave acoustic lens on beam transmission. A calibration mirror is added to the acousto-optic coupling prism with conical concave acoustic lens at the bottom, and the deterioration of the cone concave acoustic lens to the beam transmission is eliminated by optimizing the surface shape and thickness of the calibration mirror by Zemax. The optimization effect is evaluated by analyzing the spot. The simulation results show that the optimization method can eliminate the influence of the conical concave acoustic lens on the beam transmission, make the focal point and the focal point keep the coaxial focus, and improve the detection efficiency of the photoacoustic signal. This work is of theoretical significance for the systematic study of large depth of field photoacoustic microscopy.
- Published
- 2021
16. The Roles of Precursor-Induced Metal–Support Interaction on the Selective Hydrogenation of Crotonaldehyde over Ir/TiO2 Catalysts
- Author
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Tongyang Song, Mengfei Luo, Aiping Jia, Weixin Huang, Hantao Peng, Yunshang Zhang, Jiqing Lu, and Yanwen Ye
- Subjects
inorganic chemicals ,Reaction mechanism ,Chemistry ,Chemical technology ,TP1-1185 ,Photochemistry ,Catalysis ,Metal ,Reaction rate ,chemistry.chemical_compound ,Adsorption ,crotonaldehyde ,visual_art ,visual_art.visual_art_medium ,Molecule ,Crotyl alcohol ,reaction mechanism ,hydrogenation ,Physical and Theoretical Chemistry ,Crotonaldehyde ,iridium precursor ,QD1-999 ,Ir/TiO2 - Abstract
Various supported Ir/TiO2 catalysts were prepared using different Ir precursors (i.e., H2IrCl6, (NH4)2IrCl6 and Ir(acac)3) and tested for vapor phase selective hydrogenation of crotonaldehyde. The choice of Ir precursor significantly altered the Ir-TiOx interaction in the catalyst, which thus had essential influences on the geometric and electronic properties of the Ir species, reducibility, and surface acidity, and, consequently, their reaction behaviors. The Ir/TiO2-N catalyst using (NH4)2IrCl6 as the precursor gave the highest initial reaction rates and turnover frequencies of crotyl alcohol formation. Such high performance was ascribed to the high Ir dispersion and high surface concentration of Ir0 species, as well as a higher surface acidity, in the Ir/TiO2-N catalyst compared to its counterparts, indicating the synergistic roles of the Ir-TiOx interface in the reaction, as the interfacial sites were responsible for the adsorption/activation of H2 and the C=O bond in the crotonaldehyde molecule.
- Published
- 2021
17. Performance of smoke elimination and confinement with modified hybrid ventilation for subway station
- Author
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Angui Li, Tongyang Song, Wei Zhang, Na Luo, Ran Gao, and Zhipei Hu
- Subjects
Smoke ,Mechanical ventilation ,Engineering ,Subway station ,Hybrid ventilation ,business.industry ,medicine.medical_treatment ,Full scale ,Environmental engineering ,Natural ventilation ,Building and Construction ,Geotechnical Engineering and Engineering Geology ,Fire Dynamics Simulator ,medicine ,business ,Scale model - Abstract
Smoke is the element of a fire that causes the greatest loss of life. The importance of eliminating smoke is underscored in the fire safety engineering of underground subway stations. In this study, an experiment and a numerical simulation were performed to determine the efficacy of different ventilation modes. The experiment was conducted on a 1:50 scale model of a subway station and a complementary Fire Dynamics Simulator (FDS) simulation was performed on a full scale station. The influences of natural ventilation, mechanical ventilation and hybrid ventilation were examined. The results indicated that natural ventilation was good for smoke elimination when the fire source was under the dome, and the gas temperature measured in the middle of the basement 1 decreased significantly as the size of the vent increased. Smoke was exhausted from the basement 1 and fresh air supplied into the basements 2 and 3, which had the best efficacy when managing the smoke diffusion. No matter that the fire source was under the dome or out of the atrium, the carbon monoxide (CO) concentration was the smallest when the modified hybrid ventilation system was in operation. At the same time, changes in the natural ventilation vent had an influence on smoke elimination and the efficacy of smoke elimination became better with the increasing of the dimension of the vent when the fire location was under the dome.
- Published
- 2014
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