| 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. |
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| NSR催化剂12CaO-7Al2O3/10%K中水对NO还原性能的影响 |
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高爱梅 , 王华静 , 屠兢 , 李全新
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中国科学技术大学化学物理系，合肥230026
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| 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: |
