摘要
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。
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 H 2-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.
作者
陈崇来
张文霞
裘建平
贾爱平
罗孟飞
CHEN Chonglai;ZHANG Wenxia;QIU Jianping;JIA Aiping;LUO Mengfei(College of Pharmaceutics and Materials Engineering,Jinhua Polytechnic,Jinhua,Zhejiang 321017,China;College of Chemistry and Life Sciences,Zhejiang Normal University,Jinhua,Zhejiang 321004,China)
出处
《应用化学》
CAS
CSCD
北大核心
2020年第11期1293-1300,共8页
Chinese Journal of Applied Chemistry
关键词
臭氧
氧化锰八面体分子筛
堇青石蜂窝陶瓷
整体式催化剂
ozone
manganese oxide octahedral molecular sieve
cordierite honeycomb ceramics
monolithic catalysts
