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Open AccessArticle

Plasma Oxidation of H2S over Non-stoichiometric LaxMnO3 Perovskite Catalysts in a Dielectric Barrier Discharge Reactor

1, 1,2,3,*, 2 and 3,*
Faculty of Maritime and Transportation, Ningbo University, Ningbo 315211, China
State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
Department of Electrical Engineering and Electronics, University of Liverpool, Liverpool L69 3GJ, UK
Authors to whom correspondence should be addressed.
Catalysts 2018, 8(8), 317;
Received: 12 July 2018 / Revised: 22 July 2018 / Accepted: 23 July 2018 / Published: 2 August 2018
(This article belongs to the Special Issue Plasma Catalysis)
PDF [1894 KB, uploaded 2 August 2018]


In this work, plasma-catalytic removal of H2S over LaxMnO3 (x = 0.90, 0.95, 1, 1.05 and 1.10) has been studied in a coaxial dielectric barrier discharge (DBD) reactor. The non-stoichiometric effect of the LaxMnO3 catalysts on the removal of H2S and sulfur balance in the plasma-catalytic process has been investigated as a function of specific energy density (SED). The integration of the plasma with the LaxMnO3 catalysts significantly enhanced the reaction performance compared to the process using plasma alone. The highest H2S removal of 96.4% and sulfur balance of 90.5% were achieved over the La0.90MnO3 catalyst, while the major products included SO2 and SO3. The missing sulfur could be ascribed to the sulfur deposited on the catalyst surfaces. The non-stoichiometric LaxMnO3 catalyst exhibited larger specific surface areas and smaller crystallite sizes compared to the LaMnO3 catalyst. The non-stoichiometric effect changed their redox properties as the decreased La/Mn ratio favored the transformation of Mn3+ to Mn4+, which contributed to the generation of oxygen vacancies on the catalyst surfaces. The XPS and H2-TPR results confirmed that the Mn-rich catalysts showed the higher relative concentration of surface adsorbed oxygen (Oads) and lower reduction temperature compared to LaMnO3 catalyst. The reaction performance of the plasma-catalytic oxidation of H2S is closely related to the relative concentration of Oads formed on the catalyst surfaces and the reducibility of the catalysts. View Full-Text
Keywords: plasmas-catalysis; non-thermal plasmas; perovskite catalysts; nonstoichiometry; H2S oxidation plasmas-catalysis; non-thermal plasmas; perovskite catalysts; nonstoichiometry; H2S oxidation

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Xuan, K.; Zhu, X.; Cai, Y.; Tu, X. Plasma Oxidation of H2S over Non-stoichiometric LaxMnO3 Perovskite Catalysts in a Dielectric Barrier Discharge Reactor. Catalysts 2018, 8, 317.

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