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The suspended bed hydrotreating is considered as an advanced technology for high-efficiency conversion of inferior oil and waste oil with its unique advantages. Since the technology is not yet mature, some research efforts have been devoted to solving the coking problems, developing high activity and high dispersion catalysts. Among them, oil-soluble catalysts exhibit excellent catalytic activity due to their high dispersibility and low coking characteristics. Moreover, it is not necessary for these catalysts to be separated from the oil, avoiding secondary pollutants. However, the cost of catalyst is too high to realize large-scale application. Therefore, developing high-efficiency catalysts with low-cost has become the focus of research. In this paper, the current status of oil-soluble catalysts in recent years was described, focusing on the preparation, catalytic performance and active sites of different oil-soluble catalysts. Finally, the prospects for the challenges and research directions were proposed to shed light on future development of oil-soluble catalysts. [ABSTRACT FROM AUTHOR]

Hydrogen energy is a kind of secondary energy with abundant sources, green and wide application, which can realize the interconversion of chemical energy and electric energy. It is an important path for achieving deeply clean decarbonization in many fields. In addition, hydrogen will become an indispensable carrier for energy transformation and development. Electrochemically splitting water into hydrogen by renewable energy has attracted much attention due to its high efficiency, easy operation and no secondary pollution. However, the overall efficiency of hydrogen production by water electrolysis is severely restricted by the high overpotential of anodic oxygen evolution reaction (OER) and the sluggish reaction kinetics. Therefore, it is expected to use thermodynamically more oxidizable chemicals as anode additives to assist water splitting to produce hydrogen, such as electrocatalytic alcohol oxidation, which can not only significantly reduce the overpotential of hydrogen production from water splitting, but also synthesize green products with high added-value. Therefore, this paper reviews the research progress of hydrogen production from water splitting assisted by electrocatalytic alcohol oxidations in recent years, and focuses on the reaction mechanism, electrocatalytic performance, and the product selectivity of alcohol oxidations by transition metall catalysts, as well as their structure-activity relationship. Finally, the challenges and development of alcohol oxidations assisted hydrogen production from water splitting are prospected to shed light on rational design of high-efficient electrocatalysts for hydrogen production from water splitting assisted by electrocatalytic alcohol oxidations. [ABSTRACT FROM AUTHOR]

Volatile organic compounds (VOCs) can cause great harm to environment and human health. At present, the annual emission of VOCs in China has reached the same level as that of NOx and SO2 and already been classified as one of the major atmospheric pollutants. Among various VOCs elimination methods, catalytic combustion is regarded as a highly efficient and green VOCs elimination method because it can transform VOCs mo-leculars into H2O and CO2. Additionally, VOCs catalytic combustion is very fitful for the continous removal of the VOCs with low concentration in a closed space. The structure of active sites of VOCs catalytic combustion catalysts can be dramatically decided by their preparetion methods, and thus the different preparation methods can directly affect the catalytic performance of these catalysts. The preparation methods, such as impregnation method, sol-gel method, co-precipitation method, deposition-precipition, grafting method, hydrothermal synthesis method and microemulsion method, are most commonly used to prepare VOCs catalytic combustion catalysts. In the current paper, the difference among the preparation methods for VOCs catalytic combustion catalysts was focused on, in order to present the applicability of these preparation methods to the adjustment of the active sites structure and their effect on the catalytic performance of VOCs catalytic combustion catalysts. This work would provide a prospect, which was valuable for achieving highly efficient VOCs catalytic combustion catalysts, of the relationship between the different preparation methods and different catalyst structures along with different catalytic performance. [ABSTRACT FROM AUTHOR]