Abstract
Oxygen mobility contributes to HCHO oxidation at room temperature. In this work, oxygen mobilities of the Pt/CeO2 catalysts were controlled by changing ceria shapes to nanorods (CeO2-R), nanocubes (CeO2-C) and nanoparticles (CeO2-P) for HCHO elimination. The smallest ceria crystallite size, the strongest metal-support interaction and the most oxygen vacancy in the Pt/CeO2-R catalyst than those in the Pt/CeO2-C and Pt/CeO2-P catalysts resulted in the greatest redox of surface lattice oxygen and the most oxygen molecules activation at oxygen vacancy sites. These contributed to the most active mobile oxygen and therefore the highest HCHO oxidation performance. In-situ diffused reflectance infrared Fourier-transform spectra (DRIFT) indicated the fastest decomposition of formate at Pt-CeO2 interface on the Pt/CeO2-R catalyst because of its highest oxygen mobility. This work illustrated importance of oxygen mobility for efficient HCHO oxidation.
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