(12a) Selective Hydrogenation of CO2 and CO over Potassium Promoted Co/ZSM-5
AIChE Annual Meeting
2021
2021 Annual Meeting
Catalysis and Reaction Engineering Division
CO2 Upgrading: Photo/Reduction, Hydrogenation, and Thermal Upgrading
Sunday, November 7, 2021 - 3:30pm to 3:48pm
The contrast in trends over the two classes of catalysts is further elucidated by in situ EXAFS (Figure 3), demonstrating that increased contact of K and Co in the IWI catalysts facilitates donation of electrons from electropositive potassium to the more electronegative cobalt. Interestingly, the IWI catalysts with a lower Si/Al ratio are reduced to a lesser extent, likely because the higher acid site density within H-ZSM-5 (Si/Al = 50) prevents complete reduction of the Co nanoparticles. Therefore, both the structure of the K-Co active phase and acidic properties of ZSM-5 are responsible for controlling the performance during CO2-FTS.
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[2] Liu, R., et al., Appl. Catal. B: Environ. 2021, 284, 119787.