We have developed a bifunctional catalyst contained partially reducible metal oxides (In2O3) and HZSM-5, which exhibited excellent performance for the direct production of C5~C11 hydrocarbons from CO2 hydrogenation with high selectivity. The C5+ (hydrocarbons with five or more carbons) selectivity in hydrocarbons distribution reached up to 78.6% with only 1% for CH4 selectivity at a CO2 conversion of 13.1%. There was no obvious catalyst deactivation over 150 h, and much better performance for CO2 hydrogenation to C5+ hydrocarbons was observed using pellet catalyst with internal gas recycling. Such results thus suggest a promising potential for its industrial application.
With the above oxide/zeolite bifunctional catalyst for CO2 hydrogenation to hydrocarbons, the hydrocarbon distribution can be easily tuned through the shape selectivity of the zeolite. When SAPO-34 was chosen as the active phase for C−C coupling, the selectivity to lower olefins reached 80% in hydrocarbons with only 4% of CH4 at more than 35% CO2 conversion.
We also fabricated a highly efficient multifunctional catalyst composed of a spinel structural oxide with hierarchical nanocrystalline HZSM-5 zeolites for selective transformation of CO2 into aromatics. This catalyst displays high aromatic yield (>18%) with high CO2 conversion (~35%), and the total selectivity of CH4 and CO has been successfully suppressed to less 20%.
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