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 SmMn2O5 catalyst
after acid etching was used as the support, and the manganese mullite
composite catalyst was prepared by loading Ag and CeO2 nanoparticles
on its surface. By means of SEM, TEM, XRD, N2-BET, XPS,
EPR, H2-TPR, O2-TPD, NH3-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 CeO2-SmMn2O5-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 CeO2 nanoparticles was optimized. Highly dispersed
Ag and CeO2 nanoparticles have a highly synergistic effect
with the support SmMn2O5, and the reactive oxygen
species provided by CeO2 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 SmMn2O5 has been developed.