Catalytic Oxidation of Acetone on SmMn₂O₅: Effect of Acid Etching and Loading Treatment

Inthis study, high-efficiency CeO2-SMO-H andAg-SMO-H catalysts for acetone degradation were prepared by the combinationof acid etching and load treatment. The synergistic effect of CeO2 and Ag with acid-etched SMO support, reactive oxygen speciesprovided by Ce4+ and Ce3+ cycling, and electrontransfer brought by Ag all contribute to the excellent activity ofthe catalyst. The key of catalytic oxidation technology is to developa stablecatalyst with high activity. It is still a serious challenge to achievehigh conversion efficiency of acetone with an integral catalyst atlow temperature. In this study, the SmMn2O5 catalystafter acid etching was used as the support, and the manganese mullitecomposite catalyst was prepared by loading Ag and CeO2 nanoparticleson its surface. By means of SEM, TEM, XRD, N-2-BET, XPS,EPR, H-2-TPR, O-2-TPD, NH3-TPD, DRIFT,and other characterization methods, the related factors and mechanismanalysis of acetone degradation activity of the composite catalystwere discussed. Among them, the CeO2-SmMn2O5-H catalyst has the best catalytic activity at 123 and 185 degrees C for T (50) and T (100), respectively, and shows excellent water and thermalresistance and stability. In essence, the surface and lattice defectsof highly exposed Mn sites were formed by acid etching, and the dispersibilityof Ag and CeO2 nanoparticles was optimized. Highly dispersedAg and CeO2 nanoparticles have a highly synergistic effectwith the support SmMn2O5, and the reactive oxygenspecies provided by CeO2 and the electron transfer broughtby Ag further promote the decomposition of acetone on the carrierSMO-H. In the field of catalytic degradation of acetone, a new catalystmodification method of high-quality active noble metals and transitionmetal oxides supported by acid-etched SmMn2O5 has been developed.