Catalytic hydrogenation of CO2 to light olefins by using K-doped FeCx catalysts derived from the Fe-chitosan complex

K-doped FeCx catalysts derived from the carbothermal reduction of the Fe-chitosan complex were investigated and tested in the hydrogenation of CO2 to light olefins (C2-6 Catalyst characterization, including bulk composition, porosity, crystallinity, Fe coordination, morphology, surface property, and basicity, was conducted. The physicochemical properties of tested catalysts were correlated with their performances. The mechanistic study discovered that bidentate carbonates, monodentate carbonate, bicarbonate, and formate species were intermediates involved in C2-6= synthesis. The yield of C2-6= was found to be dependent on the composition of the carbide phases of K-doped FeCx catalysts. The most active catalyst, i.e., FeK@CS-(0.5)-py, showed the most promising space-time yield of C-2-6(-) (13.7 mu mol(C2-6=)/g(Fe)/s). (c) 2022 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Automated summary

K-doped FeCx catalysts derived from the carbothermal reduction of the Fe-chitosan complex were investigated for the hydrogenation of CO2 to light olefins. Catalyst characterization and performance evaluation revealed a correlation between the physicochemical properties of the catalysts and their catalytic activities. Mechanistic studies identified various carbonate and formate species as intermediates involved in C2-6= synthesis. The most active catalyst, FeK@CS-(0.5)-py, exhibited the highest space-time yield of C-2-6(-) (13.7 mu mol(C2-6=)/g(Fe)/s).