The continued growth of anthropogenic emissions of CO2 caused the climate change, and carbon capture and utilization (CCU) have been proposed as the possible technologies to mitigate climate change. Transformation of CO2 to valuable chemicals can not only mitigate CO2 emissions, but also reduce consumption of fossil resources. CO2 molecule is very stable and the C-C coupling is more difficult, therefore, few studies focused on the C2+ hydrogenation synthesis directly from CO2. Fe5C2 was used as active sites and mixed with potassium modified supports for CO2 hydrogenation to synthesis value-added hydrocarbons. Many supports were tested and the alkaline Al2O3 is the better choice. The potassium migrated into Fe5C2 during reaction so the methane selectivity over Fe5C2-K/Al2O3 is much lower than Fe5C2. The selectivity of C2+ is 69.2 % containing 35.8 % C2-C4= and 29.1 % C5+ with the 31.5 % CO2 conversion (H2/CO2=3). When the ratio of H2 and CO2 is switched to 4, CO2 conversion improved to 40.9 %, and the C2+ selectivity 73.5 %, containing 37.3 % C2-C4= and 31.1 % C5+. The mixture catalysts can be directly used without any reduction before reaction, reducing the consumption H2 and simplifying the operation.

Direct transformation of carbon dioxide to value-added hydrocarbons by physical mixtures of Fe5C2 and potassium modified Al2O3

255th National Meeting (2018)

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