The rod-like CeO2 supported by the low-loading Au nanoparticles for the efficient catalytic oxidation of CO at room temperature

Abstract

Au–CeO2 composite with rod-like structure is successfully prepared by simple and mature one-step hydrothermal method. The results of meteorological chromatographic analysis show that the CO conversion rate of 0.7% Au–CeO2 is 50% at 47 °C, and the CO conversion rate of 1.0%Au–CeO2 is more than 70% at room temperature. Characterization results of test show the Au–CeO2 catalyst excellent catalytic activity due to good dispersibility of Au nanoparticles, specific surface area of the material, the enhanced ability of reducing catalyst and catalyst surface mutual synergy between different valence state of ions, which effectively promoted the generation of the oxygen vacancy and marked the surface of the catalyst increase reactive oxygen content. Finally, the catalytic mechanism of Au–CeO2 composites is summarized through the mutual verification between analysis of characterization analysis and performance test results. The main highlight of the research in this thesis is that the low proportion of gold modified ceria catalyst can be catalyzed at room temperature. It is hoped that this work will provide insights into the development of highly active catalysts.