Promotion of oxygen vacancies and metal-support interaction over 3DOM Au/CeO2 catalyst for CO oxidation

Abstract

CO oxidation is the primary approach for eliminating CO from incomplete combustion, and the catalytic performance is dependent on the structure of catalysts. Herein, to explore the structure promotion in the CO oxidation reaction, polymethyl methacrylate was synthesized as the hard template to fabricate the three-dimensional ordered microporous (3DOM) Au/CeO2 and compared the catalytic performance with the Au/CeO2 rod catalyst. The 3DOM Au/CeO2 catalyst could realize complete CO oxidation at 90 °C while 110 °C for Au/CeO2 rod catalyst. The 3DOM Au/CeO2 catalyst also showed outstanding stability for 60 h reaction. The achieved high performance could be attributed to the pore structures and the better metal-support interaction that facilitates abundant oxygen vacancies. Additionally, the Au distribution and oxygen vacancies promoted by the macropores structures were discovered using a series of characterizations. This work highlights the promotion of oxygen vacancies and metal-support interaction by 3DOM structure in CO oxidation reaction.