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Ozone elimination over oxygen-deficient MnOx based catalysts: effect of different transition metal dopants
Chemical Engineering Science ( IF 4.7 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.ces.2020.116011
Lei Zhang , Sheng Wang , Changjun Ni , Mingzhe Wang , Shudong Wang

Abstract Ozone pollutant can be decomposed by catalysts at room temperature. In this study, pristine β-MnO2 and those doped with Co, Cu, and Ce were synthesized by a redox precipitation method. Their catalytic performance on ozone decomposition was further investigated at room temperature under both dry and humid (RH = 35%) gas conditions. Our results showed that Co and Cu doped MnO2 catalysts, especially the Co doped one, could enhance the room-temperature decomposition activity and improve the stability of catalyst. But Ce doped MnO2 catalyst exhibited lower ozone decomposition activity even than the pristine MnO2. To reveal their intrinsic promotion and inhibition mechanisms, those catalysts were characterized with XRD, N2 physisorption, TEM, SEM, XPS, Raman, H2-TPR, and O2-TPD. The introduction of dopants in MnO2 catalysts resulted in higher surface specific area and lower crystallinity than their pristine counterpart. Those dopants also helped tailor the number and type of the oxygen vacancies on the surface of catalysts. The appearance of isolated CeO2 in Ce doped MnO2, though have more oxygen vacancies, hindered the desorption of oxygen intermediates owing to their different nature of oxygen vacancies when compared to those Co or Cu doped catalysts.

中文翻译:

缺氧 MnOx 基催化剂的臭氧消除:不同过渡金属掺杂剂的影响

摘要 臭氧污染物在常温下可被催化剂分解。在这项研究中,原始的 β-MnO2 和那些掺杂了 Co、Cu 和 Ce 的物质是通过氧化还原沉淀法合成的。在室温和干燥和潮湿(RH = 35%)气体条件下进一步研究了它们对臭氧分解的催化性能。我们的结果表明,Co和Cu掺杂的MnO2催化剂,尤其是Co掺杂的催化剂,可以提高室温分解活性,提高催化剂的稳定性。但是,Ce 掺杂的 MnO2 催化剂表现出比原始 MnO2 更低的臭氧分解活性。为了揭示它们内在的促进和抑制机制,这些催化剂用 XRD、N2 物理吸附、TEM、SEM、XPS、拉曼、H2-TPR 和 O2-TPD 进行了表征。在 MnO2 催化剂中引入掺杂剂导致比原始催化剂更高的表面积和更低的结晶度。这些掺杂剂还有助于调整催化剂表面氧空位的数量和类型。与那些 Co 或 Cu 掺杂的催化剂相比,Ce 掺杂的 MnO2 中孤立的 CeO2 的出现,虽然具有更多的氧空位,但由于氧空位的不同性质,阻碍了氧中间体的解吸。
更新日期:2021-01-01
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