引用本文:
【打印本页】   【HTML】   【下载PDF全文】   View/Add Comment  【EndNote】   【RefMan】   【BibTex】
←前一篇|后一篇→ 过刊浏览    高级检索
本文已被:浏览 1676次   下载 785 本文二维码信息
码上扫一扫!
分享到: 微信 更多
Efect of H2O on NO Reduction over NSR Catalyst 12CaO-7Al2O3/10%K
Ai-mei Gao, Hua-jing Wang, Jing Tu, 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
中国科学技术大学化学物理系,合肥230026
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
分类号: