期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 264, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2019.118464
关键词
Mn-based catalyst; Oxygen vacancy defect; Involved intermediates; VOCs oxidation; In situ DRIFTS
资金
- National Natural Science Foundation of China [51878292, 51808227, 51678245]
- National Key R D Plan [2017YFCO211503]
- China Postdoctoral Science Foundation [2018M643090]
- Science and Technology Program of Guangdong [201804020026, 2017B090901049]
- Guangdong Natural Science Foundation [2016A030311003]
To elucidate the role of oxygen vacancy defects, various Mn-based oxides with oxygen vacancy defects are employed to the toluene oxidation, which are synthesized by adjusting solvent and double-complexation routes. The MnOx-ET catalyst shows the highest catalytic activity (T-90 = 225 degrees C) for toluene oxidation. Compared with other Mn-based oxides, the as-prepared MnOx-ET catalyst has more surficial oxygen vacancies and good oxygen storage capacity (OSC), which is the reason on its remarkable activity for toluene oxidation. In addition, in situ DRIFTS study reveals that both lattice oxygen and adsorbed oxygen species can participate in the activation-oxidation process of toluene, which results in two reaction routes for the toluene oxidation. The rich oxygen-vacancy concentration of catalysts accelerates the key steps for the activation and generation of oxidized products. Quasi-in situ XPS results further confirm that enrich adsorbed-oxygen species as active oxygen and increasing Mn4+ concentration enhance the superior activity for toluene oxidation.
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