Issue 27, 2021, Issue in Progress

Facial controlled synthesis of Pt/MnO2 catalysts with high efficiency for VOCs combustion

Abstract

Two sets of experiments were initially implemented to explore the best impregnation method and the best morphology substrate. In the first case, Pt/MnO2-r-WI catalyst showed a better performance than that of Pt/MnO2-r-IW. The test results illustrated that Wetness Impregnation (WI) could enhance the dispersion of Pt, ratios of Mn4+/Mn3+, Oads/Olatt and Pt4+/Pt0 as compared to those of Incipient Wetness Impregnation (IW). In the other method, MnO2-s catalyst displayed a higher catalytic efficiency than that of MnO2-r because the nanosphere morphology had larger BET surface area and pore volume to attract Pt atoms and toluene molecules. Therefore, the Pt/MnO2-s-WI catalyst was obtained and showed the best activity with low-temperature redox capability and oxygen mobility. It could eliminate toluene (T90) at a low temperature of 205 °C and remain stable over 150 h. effects of calcination temperature, toluene concentration and gas hourly space velocity (GHSV) were also investigated herein. In situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) was also implemented to explore the reaction mechanism. It demonstrated that toluene was firstly adsorbed over Ptδ+ on the surface before being oxidized to CO2 and H2O. The whole procedure follows the Mars-van Krevelen mechanism. This work gives a comprehensive understanding of the heterogeneous catalysis mechanism.

Graphical abstract: Facial controlled synthesis of Pt/MnO2 catalysts with high efficiency for VOCs combustion

Article information

Article type
Paper
Submitted
17 Mar 2021
Accepted
20 Apr 2021
First published
04 May 2021
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2021,11, 16547-16556

Facial controlled synthesis of Pt/MnO2 catalysts with high efficiency for VOCs combustion

J. Hu, X. Gao, Q. Fan and X. Gao, RSC Adv., 2021, 11, 16547 DOI: 10.1039/D1RA02112E

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