A Pd-In/SiO2 catalyst was prepared by the wet impregnation method and used for CO2 reduction at atmospheric pressure. The catalyst was shown to have 100% selectivity toward CO with no detectable CH4 formation. In order to understand the high CO selectivity of Pd-In/SiO2, a detailed catalyst characterization in combination with the DFT study was conducted and compared with that over the Pd/SiO2 catalyst. The XRD and TEM analyses indicate the formation of the PdIn bimetallic nanoparticles on Pd-In/SiO2 after H2 reduction. The unique catalytic property of Pd-In/SiO2 was attributed to the formation of the bimetallic particles. Characterizations including H2 chemisorption and DRIFT and DFT modeling show that the formation of PdIn bimetallic nanoparticles reduces the activity toward H2 dissociative adsorption, weakens CO binding on the surface and increases the barrier of CO hydrogenation, suppressing the further hydrogenation beyond CO.
Bibliographical noteFunding Information:
This work was supported by the National Natural Science Foundation of China (# 91334206 ).
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- Bimetallic nanoparticles
- CO reduction
- Reverse water gas shift