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题名: Promotional effect of Nb additive on the activity and hydrothermal stability for the selective catalytic reduction of NOx with NH3 over CeZrOx catalyst
作者: Ding, Shipeng; Liu, Fudong; Shi, Xiaoyan; He, Hong
刊名: APPLIED CATALYSIS B-ENVIRONMENTAL
出版日期: 2016-01
卷号: 180, 期号:0, 页码:766-774
关键词: Selective catalytic reduction ; Nitrogen oxides ; Diesel engine exhaust ; Hydrothermal stability ; CeNbZrOx mixed oxide
DOI: 10.1016/j.apcatb.2015.06.055
部门归属: 大气污染控制中心
英文摘要: The promotional mechanism of Nb addition on the activity and hydrothermal stability of CeZr2Ox catalyst for the selective catalytic reduction of NOx with NH3 (NH3-SCR) was investigated by various methods including N-2-physisorption, XRD, H-2-TPR and in situ DRIFTS. The Nb-promoted CeZr2Ox catalyst showed remarkable NH3-SCR activity together with excellent N-2 selectivity, SO2/H2O resistance and outstanding hydrothermal stability. The characterization results showed that the introduction of Nb to CeZr2Ox not only resulted in the high surface area and strong redox ability, but also promoted the adsorption and activation of NH3 and enhanced the reactivity of adsorbed nitrate together with NH3 species. All the above features were favorable for the superior NH3-SCR performance. In addition, the CeNb3.0Zr2Ox catalysts hydrothermally aged below 800 degrees C still possessed high redox ability and abundant acid sites, all of which were responsible for the excellent hydrothermal durability. The novel CeNb3.0Zr2Ox catalyst was a promising candidate for the removal of NOx from diesel engine. (C) 2015 Elsevier B.V. All rights reserved.
收录类别: SCI
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内容类型: 期刊论文
URI标识: http://ir.rcees.ac.cn/handle/311016/35763
Appears in Collections:大气污染控制中心_期刊论文

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