Catalytic oxidation of vinyl chloride emission over LaMnO3 and LaB0.2Mn0.8O3 (B = Co, Ni, Fe) catalysts

Authors:  Chuanhui Zhang, Chao Wang, Wangcheng Zhan, Yanglong Guo, Yun Guo, Guanzhong Lu, Alexandre Baylet, Anne Giroir-Fendler

Abstract:
The LaMnO₃ and LaB_0.2Mn_0.8O₃ (B = Co, Ni, Fe) perovskite-type oxides were prepared by the conventional co-precipitation method and studied as catalysts for the oxidation of vinyl chloride emission in the temperature range of 50–350 ^◦C. Their physicochemical properties were characterized by ICP-AES, N₂ adsorption, XRD, H₂-TPR, O₂-TPD and XPS. Catalytic performances were evaluated for the oxidation of 1000 ppm of VC in air at a GHSV of 15,000 h⁻¹. The substituted LaB_0.2Mn_0.8O₃ samples showed higher catalytic activity than pure LaMnO₃. Characterization results revealed that the catalytic activity of the perovskite oxides was greatly related to the low-temperature reducibility of the B site and the amount of adsorbed oxygen species and vacancies on the surface. The surface adsorbed oxygen species played a key role in the catalytic reaction and oxygen vacancies promoted the oxygen mobility. A reaction mechanism of vinyl chloride oxidation over LaMnO₃-based perovskite oxides was proposed.

Keywords:
CVOCs
Vinyl chloride
Catalytic oxidation
Perovskite
Reducibility
Adsorbed oxygen

Published in: Applied catalysis B: Environmental  (Volume 129, Pages 1-614, 17 January 2013)

Publisher: Elsevier  

ISSN Information: 0926-3373

Catalytic oxidation of vinyl chloride emission over LaMnO3 and LaB0.2Mn0.8O3 (B = Co, Ni, Fe) catalysts

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