| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 46033 | Applied Catalysis B: Environmental | 2013 | 8 Pages |
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 °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 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.
Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► LaMnO3 and LaB0.2Mn0.8O3 (B = Co, Ni, Fe) were prepared by co-precipitation method. ► The B-site substitution increased the amounts of Mn4+ on the surface. ► No by-products were formed but only CO2, H2O and HCl. ► LaNi0.2Mn0.8O3 presented the best catalytic activity for vinyl chloride abatement. ► Reducibility, surface adsorbed oxygen and O2 mobility were the main parameters.
