Recently, Research Institute of Carbon Resources, Small Molecule and Hydrogen Energy Innovation and Special Zone, Dalian Institute of Chemical Physics, Chinese Academy of Sciences Sun Jianhe and Ge Qingjie Research Team at CO 2New progress has been made in catalytic conversion studies, and by designing a multi-additive co-existing iron-based catalyst, CO has been realized. 2High selectivity for hydrogenation of linear a-olefins.
The large consumption of fossil energy makes greenhouse gas CO 2Emissions have increased dramatically, causing increasingly severe environmental problems such as global warming. 2The conversion of raw materials into high value-added chemicals can not only reduce carbon emissions, but also reduce the dependence on traditional resources such as coal and petroleum. This is of great significance. However, the selective conversion of carbon dioxide is a worldwide problem. , Preparation of high selectivity, high stability of the catalyst is facing huge challenges.
In the early period of CO 2The research of hydrogenation direct conversion to fuel gasoline (Nature Communications) was first proposed by the team. 2A new route for the direct conversion of hydrogenation to high-value chemical linear alpha-olefins (LAOs). Linear alpha-olefins are a very important and highly value-added chemical feedstock that are widely used in advanced lubricants, polyolefins, etc. However, the production of this product depends on petroleum for a long time, and the market is in short supply. In the latest research work, the team designed iron catalysts coexisting with iron oxide and iron carbide, supplemented by various electronic additives coexisting in the corn cob ( K, Mg, Ca, etc.) and Structural Additives (Si) break through the technical bottleneck of carbon dioxide hydrogenation CO bond activation and CC bond coupling. Under mild reaction conditions, the choice of olefins and linear alpha-olefins is greatly enhanced. Sex, CO 2The single-pass conversion was 31%, the olefin selectivity was 72%, and the ratio of C4-C17 linear alpha olefins in olefins (C4+) exceeded 80%. The linearity was revealed through the optimization of the multiple active sites and the spatial arrangement of the auxiliaries. The key control mechanism for the formation of a-olefins, and the continuous operation of the catalyst is stable. This work uses CO 2The research on the preparation of high-value chemicals has provided new ideas, and has also opened up new ways for the use of intermittent renewable energy sources.
The related research results were published in the new issue of Nature Publishing Group, “Communications and Chemistry”. This research was supported by the National Natural Science Foundation of China and the Youth Innovation Promotion Association of the Chinese Academy of Sciences.
