堇青石蜂窝陶瓷负载锰氧化物催化分解臭氧性能

为了提高臭氧分解催化剂的实际应用能力,通过采用过渡金属锰氧化物为原料与铝胶混合涂覆到堇青石蜂窝陶瓷载体表面,制备了不同锰氧化物负载的整体式催化剂。 然后在常温常压下考察了整体式催化剂分解臭氧的性能。 通过X射线衍射(XRD)、扫描电子显微镜(SEM)、拉曼(Raman)光谱、X射线光电子能谱仪(XPS)、BET比表面积法和程序升温还原技术(H₂-TPR)对催化剂进行了表征。 研究结果表明,不同锰氧化物催化剂的活性按以下顺序排列:氧化锰八面体分子筛(OMS-2)＞MnO₂＞Mn₂O₃＞Mn₃O₄＞MnO。 相比其它锰氧化物,OMS-2负载的整体式催化剂对臭氧的反应活性最高,这可能归因于OMS-2具有较大的比表面积和较好的还原性能,从而有利于表面氧空位的生成和参与臭氧分解反应。 研究结果为提高堇青石蜂窝陶瓷负载型整体式催化剂应用于臭氧分解的性能提供了理论依据。

Catalytic Decomposition of Ozone by Manganese Oxide Supported on Cordierite Honeycomb Ceramics

A series of different manganese oxides was mixed with aluminum gel and coated to cordierite honeycomb ceramics to produce monolithic catalysts for improving the application ability of catalysts. The performances of these monolithic catalysts in the decomposition of ozone at ambient temperature and pressure were investigated. The structures of these catalysts were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), BET specific surface area method and H₂-programmed temperature reduction (H₂-TPR) techniques. The results show that the activities of different manganese oxide supported monolithic catalysts are arranged in the following order: OMS-2 (Manganese oxide octahedral molecular sieve)＞MnO₂＞Mn₂O₃＞Mn₃O₄＞MnO. Compared with other manganese oxides, OMS-2 supported cordierite honeycomb ceramics monolithic catalyst has the highest activity to decompose ozone, probably due to the fact that OMS-2 has a larger specific surface area and better reducibility, which are favorable for the oxygen vacancy formation on the surface and participation in the decomposition of ozone. The results of this paper provide a theoretical basis for improving the performance of cordierite honeycomb ceramic supported monolithic catalyst for ozone decomposition.