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Na2O Promotion on CO2 Hydrogenation on the χ-Fe5C2(2 0 0) Surface

Understanding the origin of the high activity of Na2O promotion on the χ-Fe5C2(2 0 0) surface during CO2 hydrogenation is imperative. In this work, we revealed how Na2O promoted the catalytic performance of χ-Fe5C2 during CO2 hydrogenation. Detailed analyses confirmed that Na2O addition facilitated the adsorption of CO2 and promoted the desorption of product (C2H4). Electronic structure calculations suggested that the electron donating ability of Na could enhance the dissociation of CO2, which is essential for producing hydrocarbons from CO2.