Catalytic Oxidation of Acetone on SmMn<sub>2</sub>O<sub>5</sub>: Effect of Acid Etching and Loading Treatment
Kai Zhang, Wenhuan Wang, Honglei Ding, Weiguo Pan, Junchi Ma, Yuetong Zhao, Jie Song, Ziyi Zhang
Abstract
The key of catalytic oxidation technology is to develop a stable catalyst with high activity. It is still a serious challenge to achieve high conversion efficiency of acetone with an integral catalyst at low temperature. In this study, the SmMn 2 O 5 catalyst after acid etching was used as the support, and the manganese mullite composite catalyst was prepared by loading Ag and CeO 2 nanoparticles on its surface. By means of SEM, TEM, XRD, N 2 -BET, XPS, EPR, H 2 -TPR, O 2 -TPD, NH 3 -TPD, DRIFT, and other characterization methods, the related factors and mechanism analysis of acetone degradation activity of the composite catalyst were discussed. Among them, the CeO 2 -SmMn 2 O 5 -H catalyst has the best catalytic activity at 123 and 185 °C for T 50 and T 100, respectively, and shows excellent water and thermal resistance and stability. In essence, the surface and lattice defects of highly exposed Mn sites were formed by acid etching, and the dispersibility of Ag and CeO 2 nanoparticles was optimized. Highly dispersed Ag and CeO 2 nanoparticles have a highly synergistic effect with the support SmMn 2 O 5, and the reactive oxygen species provided by CeO 2 and the electron transfer brought by Ag further promote the decomposition of acetone on the carrier SMO-H. In the field of catalytic degradation of acetone, a new catalyst modification method of high-quality active noble metals and transition metal oxides supported by acid-etched SmMn 2 O 5 has been developed.