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Efect of H2O on NO Reduction over NSR Catalyst 12CaO-7Al2O3/10%K
Ai-mei Gao,Hua-jing Wang,Jing Tu,Quan-xin Li*
Author NameAffiliation
Ai-mei Gao Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China 
Hua-jing Wang Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China 
Jing Tu Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China 
Quan-xin Li* Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China 
Abstract:
A novel NOx storage/reduction catalyst 12CaO-7Al2O3/10%K, defined as C12A7/K, was prepared, which possesses good NOx storage/reduction ability with a high sulfur-tolerance. The effect of H2O on the NO reduction features over the C12A7/K catalyst was investigated. The NO conversion and the N2 selectivity were measured as a function of temperature and H2O concentration. In the presence of 1.2% H2O, both the NO conversion and the N2 selectivity significantly decrease at lower temperature region (<500 ±C). At temperatures over 500 ±C, however, the NO reduction is only slightly influenced by H2O. The species of NO3?/NO2? are confirmed as main storage components in the C12A7/K catalyst, which are further reduced into N2 by H2 under the reduction conditions.
Key words:  NO reduction, Water, N2 selectivity
FundProject:supported by the "Hundred TalentProgram 2002" by the Chinese Academy of Sciencesand the "Ph.D Innovation Program 2005" by the National Synchrotron Radiation Laboratory of ministry ofeducation.
NSR催化剂12CaO-7Al2O3/10%K中水对NO还原性能的影响
高爱梅 ,王华静 ,屠兢 ,李全新
摘要:
主要讨论在不同反应温度和不同水蒸汽浓度下,新型的NOx储 存-还原催化剂12CaO-7Al2O3/10%K (简称C12A7/K)中水的存在 对NO还原性能的影响. 研究结果表明,当存在1.2%水蒸汽,并低 于500 ℃时,NO转化率和N2的选择性均降低,水蒸汽的存在对催化 剂低温区的活性起到较明显的抑制作用;而温度高于500 ℃时,此 抑制作用则基本消失,说明此时C12A7/K催化剂的水热稳定性较好. FT-IR结果证明储存NOx后的C12A7/K样品中形成了NO3/NO2 的 反应中间物种,用H2还原
关键词:  NO还原,H2O,N2选择性
DOI:10.1360/cjcp2006.19(6).555.4
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