Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 129, Issue -, Pages 509-516Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2012.09.056
Keywords
CVOCs; Vinyl chloride; Catalytic oxidation; Perovskite; Reducibility; Adsorbed oxygen
Funding
- National Basic Research Program of China [2010CB732300]
- National High Technology Research and Development Program of China [2011AA03A406]
- 111 Project [B08021]
- China Scholarship Council
- Institut de recherches sur la catalyse et l'environnement de Lyon (IRCELYON)
- Universite Claude Bernard Lyon 1 (UCBL1)
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The LaMnO3 and LaB0.2Mn0.8O3 (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 degrees C. Their physicochemical properties were characterized by ICP-AES, N-2 adsorption, XRD, H-2-TPR, O-2-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 LaB0.2Mn0.8O3 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. (C) 2012 Elsevier B.V. All rights reserved.
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