Recently, the research team of Sun Jian and Ge Qingjie, the research group of carbon resources small molecule and hydrogen energy utilization innovation institute of Dalian Institute of Chemical Physics, Chinese Academy of Sciences, in CO 2New progress has been made in the study of catalytic hydrogenation to synthesize isoparaffins. The relevant results were published in the form of research papers at ACS Catalysis published by the American Chemical Society.
With CO 2Catalytic conversion of carbon dioxide, and H2 produced from renewable energy electrolyzed water into high value-added hydrocarbon compounds, not only CO 2Emission reduction can also solve the problem of excessive dependence on fossil fuels and storage of renewable energy. It has important strategic significance. Accurate regulation of C-O bond activation and C-C bond coupling is CO 2A very challenging problem in hydroconversion is the realization of CO 2The key to efficient conversion and utilization. The team has achieved CO in recent years by designing multiple active catalysts. 2Direct conversion of hydrogenation to produce gasoline fraction hydrocarbons (Nature Communications), linear a-olefins (Communications Chemistry) and low-carbon olefins (Catalysis Science & Technology).
In this work, Wei Jian, Yao Ruwei, etc. passed Na-Fe 3O4Coupling with HMCM-22 molecular sieve to form a multi-functional catalyst, realizing the synergistic catalysis of three series reactions of reverse water vapor shift, C-C coupling and isomerization, and successfully utilizing CO 2And H 2One-step, high yield synthesis of isoparaffins. When CO 2When the single pass conversion rate is controlled at about 26%, the CO selectivity is only 17%, and the hydrocarbon C 4+The hydrocarbon selectivity is up to 82%, and the isoparaffin ratio is as high as 74%, and the space-time yield is up to 105 mgiso gcat. -1h-1Studies have shown that the unique pore structure and Brnsted acid properties of MCM-22 molecular sieves promote the olefin intermediate to the isomerization reaction while inhibiting the aromatization reaction. In addition, the study also studies the formation of isoparaffins. The reasons for the inactivation of molecular sieves, the nature of carbon deposition and the method of molecular sieve regeneration have been discussed. 2The design and application of hydrogenation to obtain high carbon hydrocarbon catalysts provide new ideas.
The above research work was funded by the National Natural Science Foundation of China, the Strategic Pilot Science and Technology Project of the Chinese Academy of Sciences, and the Chinese Academy of Sciences Youth Promotion Association.
