Effect of different supports on activity of Mn-Ce binary oxides catalysts for toluene combustion

The effects of support materials on catalytic performance were investigated in catalytic removal of toluene. And the Mn-Ce binary oxides as active components were supported on ZrO2, SiO2, gamma-Al2O3 and TiO2 support materials. Many techniques, including X-ray diffraction (XRD), Brunauer-Emmett-Teller method (BET), X-ray photoelectron spectroscopy (XPS), temperature-programmed reduction (TPR) and NH3-temperature-programmed desorption (NH3-TPD), were used to characterize physicochemical properties. Among the different catalysts, the MnCe/ZrO2 catalyst with the lowest specific surface area (39.7 m(2)/g) shows the best catalytic activity. In terms of toluene conversion, the activity order is as follows: MnCe/ZrO2 > MnCe/TiO2 asymptotic to MnCe/SiO2 > MnCe/Al2O3. The better performance of MnCe/ZrO2 should be attributed to the low-temperature reducibility, and abundant surface species (Mn4+ and lattice oxygen). And XPS and TPR results reveal that more surface abundant Mn and Ce elements generate good interaction in MnCe/ZrO2. The weak interaction between metal oxide and support also boosts the dispersion and complete reduction of MnCe oxides at low temperature. In addition, the in-situ DRIFTS results clarify that the carbonate species are main intermediates in MnCe/ZrO2 sample during surface reaction process. (C) 2021 Chinese Society of Rare Earths. Published by Elsevier B.V. All rights reserved.

Automated summary

The effects of different support materials on the catalytic performance of toluene removal were investigated. The Mn-Ce binary oxides supported on ZrO2 showed the best catalytic activity, attributed to low-temperature reducibility and abundant surface species. XPS and TPR results revealed good interaction between Mn and Ce elements in MnCe/ZrO2, and weak interaction between metal oxide and support promoted the dispersion and reduction of MnCe oxides at low temperature.