Chinese Academy of Sciences Dalian Institute of Chemical Physics Li Can team in CO 2Progress has been made in the catalytic hydrogenation of light olefins: The CO 2Highly selective conversion to light olefins.
Using clean energy system H 2And CO 2Hydrogenation directly into light olefins, the greenhouse gas CO 2One of the important ways of resource utilization is that low-carbon olefins (ethylene, propylene, butylene) are the most important and basic chemical raw materials for the synthesis of organic materials. However, the traditional synthesis methods are mainly naphtha cracking and coal preparation by methanol , All need to rely on fossil resources (oil and coal) .Therefore, the use of CO 2Into high value-added light olefins, both CO can be achieved 2Carbon resource utilization, but also can play CO 2Role, has important strategic significance.But due to CO 2Thermodynamically more inert molecules to achieve CO 2Of the activation and high selectivity of the transformation there is a big difficulty and challenge.In this study, Li Can team constructed ZnZrO solid solution oxide / Zn modified SAPO molecular sieve tandem catalyst.
The catalyst (ZnZrO / SAPO) in the near-industrial reaction conditions, the hydrocarbons in the low-carbon olefin selectivity of up to 80-90%, and has good stability and anti-sulfur poisoning performance in the series catalyst system In the area of construction, Li Can team found that on the ZnZrO solid solution oxide CO 2Hydrogenation can be highly selective synthesis of methanol (the results published in Science Advances, the paper link), on the basis of the ZnZrO solid solution oxide and SAPO catalyst in series CO 2Direct hydrogenation of light olefins prepared by infrared spectroscopy and isotope experiments show that CO 2And H 2In ZnZrO solid solution oxide is activated to generate CH xO intermediate species, the intermediate species migrated from the ZnZrO surface to the molecular sieve pores, and then completed the formation of carbon-carbon bonds.The synergistic mechanism between tandem catalysts and the key intermediate species CH xO surface migration to CO 2The thermodynamic and kinetic coupling of hydrogenation to the light olefins reaction was achieved. This study was also conducted for the CO 2Transformation to expand the new ideas, but also for the synthesis of light olefins opened up new avenues.
Relevant research results have been published in ACS Catalysis, and the project has been funded by the Chinese Academy of Sciences strategic pilot science and technology project, the National Natural Science Foundation of China, methanol conversion of Dalian Institute of Materia Medica and basic research of coal substitute oil new technology and postdoctoral fund.
