544796 Direct CO2 Hydrogenation into Liquid Fuels and Chemicals with High Selectivity

Wednesday, June 5, 2019: 2:57 PM
Texas Ballroom EF (Grand Hyatt San Antonio)
Peng Gao Sr., Hui Wang and Yuhan Sun, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai, China

As an economical, nontoxic, renewable and abundant carbon source, chemical utilization of CO2 to value-added products is very attractive because it can not only alleviate the global warming caused by increasing atmospheric CO2 concentration, but also offer a solution to replace dwindling fossil fuels. Thus, much attention has been paid to the CO2 conversion to various C1 feedstock. Due to the extreme inertness of CO2 and a high C–C coupling barrier, it is still a great challenge to synthesize C2+ products directly from CO2, such as olefins, gasoline and aromatics.

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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See more of this Session: CO/CO2 Activation Rapid Talks
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