Total oxidation of propane in Ag-doped MnCeOx catalysts: The role of Ag species

The development of highly active catalysts for eliminating volatile organic compounds (VOCs) at low temper-ature is desirable but remains challenging. In this study, a series of Ag-loaded MnCeOx catalysts were fabricated. Catalysts with an Ag loading of 5 wt% exhibited the highest catalytic activity (T90 = 242 degrees C) and excellent stability in H2O, NO2, and CO atmosphere. Characterization results revealed that the introduction of Ag increased Mn4+ and Ce3+ concentrations and enhanced surface oxygen migration capability, which is conducive to the adsorption and dissociation of propane and O2. Combining in-situ diffuse reflectance infrared Fourier transform and discrete Fourier transform calculation revealed a novel propane oxidation pathway on MnCeOx and Ag/ MnCeOx. The addition of Ag species can convert propane into propylene in the initial stage and reduce the activation energy. This study supplied a novel insight into Ag-doped catalysts catalytic mechanism for VOCs oxidation reaction.

Automated summary

In this study, Ag-loaded MnCeOx catalysts were fabricated and their catalytic activity for VOCs at low temperature was investigated. The introduction of Ag enhanced the catalytic activity by increasing the concentrations of Mn4+ and Ce3+ and enhancing the surface oxygen migration capability. The catalytic mechanism was thoroughly studied and analyzed.