Transition metal doped cryptomelane-type manganese oxide catalysts for ozone decomposition

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	Transition metal doped cryptomelane-type manganese oxide catalysts for ozone decomposition
	He, Hong; Ma, Jinzhu; Wang, Caixia
刊名	APPLIED CATALYSIS B-ENVIRONMENTAL
	2017-02-01
卷号	201 期号:0 页码:503-510
关键词	Octahedral Molecular Sieve (Oms) Manganese Dioxide Cryptomelane Transition Metal-doped Mno2 Ozone Decomposition
英文摘要	Transition metal (Cerium, Cobalt, and Iron) doped cryptomelane-type manganese oxide (M-OMS-2) catalysts have been successfully synthesized and characterized. The different metal-ion-doped K-OMS-2 catalysts showed distinct differences in their ozone decomposition activity. Cerium-doped OMS-2 materials showed ozone conversion of 90% under RH = 90% and space velocity of 600,000 h(-1). X-ray diffraction (XRD), thermogravimetric analysis (TGA), and X-ray photoelectron spectroscopy (XPS) data suggested that the as-synthesized M-OMS-2 materials were all crystalline with no segregated metal oxide impurities. ICP-OES and XAFS results confirmed that CO3+ and Fe3+ replace Mn3+ in the cryptomelane structure and Ce4+ mainly replaces the K+ in the tunnel and partially replaces the Mn4+ in the framework of the cryptomelane structure. Because of the differences in the substitution sites and the ionic radius of dopants, the morphologies of the catalysts were different. The Mn3+ content and number of surface defects play a key role during the decomposition of ozone. Ce-OMS-2 is a promising catalyst for purifying waste gases containing ozone under high-humidity conditions. (C) 2016 Elsevier B.V. All rights reserved.
内容类型	期刊论文
源URL	[http://ir.rcees.ac.cn/handle/311016/39215]
专题	生态环境研究中心_大气污染控制中心
推荐引用方式 GB/T 7714	He, Hong,Ma, Jinzhu,Wang, Caixia. Transition metal doped cryptomelane-type manganese oxide catalysts for ozone decomposition[J]. APPLIED CATALYSIS B-ENVIRONMENTAL,2017,201(0):503-510.
APA	He, Hong,Ma, Jinzhu,&Wang, Caixia.(2017).Transition metal doped cryptomelane-type manganese oxide catalysts for ozone decomposition.APPLIED CATALYSIS B-ENVIRONMENTAL,201(0),503-510.
MLA	He, Hong,et al."Transition metal doped cryptomelane-type manganese oxide catalysts for ozone decomposition".APPLIED CATALYSIS B-ENVIRONMENTAL 201.0(2017):503-510.