NDLI: Plasma-Catalytic Oxidation of Toluene on Mn$_{x}$O$_{y}$ at Atmospheric Pressure and Room Temperature

Content Provider	Springer Nature Link
Author	Lu, Meijuan Huang, Rong Wang, Peitao Chen, Limin Wu, Junliang Fu, Mingli Wen, William Huang, Bichun Ye, Daiqi
Copyright Year	2014
Abstract	Mn$_{x}$O$_{y}$/SBA-15 catalysts were prepared via the impregnation method and utilized for toluene removal in dielectric barrier discharge plasma at atmospheric pressure and room temperature. The catalysts were characterized by X-ray diffraction, N$_{2}$ adsorption–desorption, Raman spectroscopy, X-ray photoelectron spectroscopy, H$_{2}$ temperature-programmed reduction, and O$_{2}$ temperature-programmed desorption methods. The characterization results indicated that manganese loading did not influence the 2D-hexagonal mesoporous structure of SBA-15. The catalyst had various oxidation states of manganese (Mn$^{2+}$, Mn$^{3+}$, and Mn$^{4+}$), with Mn$^{3+}$ being the dominant oxidation state. Toluene removal was investigated in the environment of pure N$_{2}$ and 80 % N$_{2}$ + 20 % O$_{2}$ plasma, showing that the toluene removal efficiency and CO$_{2}$ selectivity were noticeably increased by Mn$_{x}$O$_{y}$/SBA-15, especially in the presence of 5 % Mn/SBA-15. This activity was closely related to the high dispersion of 5 % Mn on SBA-15 and the lowest reduction temperature exhibited by this catalyst. Mn loading increased the yield of CO$_{2}$ in the N$_{2}$ plasma and promoted the deep oxidation of toluene. During toluene oxidation, oxygen exchange might follow a pathway, wherein bulk oxygen was released from the Mn$_{x}$O$_{y}$/SBA-15 surface; gas-phase O$_{2}$ subsequently filled up the vacancies created on the oxide. Each of the manganese oxidation states played an important role; Mn$_{2}$O$_{3}$ was considered as a bridge for oxygen exchange between the gas phase and the catalyst, and Mn$_{3}$O$_{4}$ mediated transfer of oxygen between the catalyst and toluene.
Starting Page	1141
Ending Page	1156
Page Count	16
File Format	PDF
ISSN	02724324
Journal	Plasma Chemistry and Plasma Processing
Volume Number	34
Issue Number	5
e-ISSN	15728986
Language	English
Publisher	Springer US
Publisher Date	2014-05-09
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Dielectric barrier discharge (DBD) Mn$_{x}$O$_{y}$/SBA-15 Toluene removal Oxygen exchange Inorganic Chemistry Mechanics Characterization and Evaluation of Materials Mechanical Engineering
Content Type	Text
Resource Type	Article
Subject	Chemistry Surfaces, Coatings and Films Condensed Matter Physics Chemical Engineering

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