CO2 hydrogenation using H2 produced with renewable energy sources is a promising research direction to produce methanol, hydrocarbons, synthetic natural gas (methane) and chemicals. In my group, the research work on the conversion of CO2 over solid catalysts was divided into three parts: (1) The conversion of CO2 into methane over Co/ZrO2, it was found that Co/ZrO2 catalyst exhibited high activity and stability through adjusting the metal-support interaction and the special metal-support interface, such as Co-Zr interface. The 10Co/ZrO2 catalyst showed high activity with CO2 conversion of 92.5 % and CH4 selectivity of 99.9 % without deactivation even after 300 h time on stream (TOS). However, the 10Co/Al2O3 catalyst gave a lower CO2 conversion of 77.8 % which decreased to 38.6 % after 300 h TOS. (2) The conversion of CO2 into olefins over Fe-based catalysts, FeZn-NC and FeZnK-NC were prepared and exhibited high activity with 29.3 % and 34.6 % CO2 conversion, respectively. More importantly, the selectivity to value-added hydrocarbons (i.e., C2-C4= and C5+), which are of great importance to chemical industry and energy, was prominent over these two catalysts, and higher than 54 C-mol%. it was also found that Fe5C2 played a key role in the CO2 conversion, different from the role in the CO conversion. Fe3O4 and χ-Fe5C2 containing catalysts displayed the best performance. However, metallic iron and/or θ-Fe3C containing catalysts exhibited relative inferior performance. (3) The conversion of CO2 into aromatics, it was found that CO2 can be converted into aromatics over ZnZrO2 system, the main products are BTX and trimetylbenzene.

Conversion of CO2 into value-added chemicals over solid catalysts

255th National Meeting (2018)

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