| 李哲,刘振宇.以金属氧化物及钙钛矿结构化合物为活性组分的ZSM-5催化剂上NOx选择性还原研究[J].分子催化,2000,(5):354-358 |
| 以金属氧化物及钙钛矿结构化合物为活性组分的ZSM-5催化剂上NOx选择性还原研究 |
| Catalytic Reduction of NOx over Metaloxide- and Perovskite-ZSM-5 Catalysts in Presence of Water Vapour |
| 修订日期：2000-04-06 |
| DOI： |
| 中文关键词: 选择性催化还原 氮氧化物 ZSM－5催化剂 |
| 英文关键词:NO x reduction,Metal\|ZSM\|5,Peroviskite,Water vapour |
| 基金项目: |
| 李哲 刘振宇 |
| [1]太原理工大学化工学院,太原 [2]中国科学院山西煤炭化学研究所,太原 |
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| 中文摘要: |
| 研究了在水蒸汽存在条件下，以ＮＨ３为还原剂，金属／ＺＳＭ－５催化剂和负载于ＺＳＭ－５上的钙钛矿结构催化剂上的ＮＯｘ选择性催化还原（ＳＣＲ）性能。实验结果表明，当反应气中通入水蒸汽时，各样品的催化活性均下降，同时伴随着Ｎ２选择性的增加。而Ｃｕ－ＺＳＭ－５样品却表现出独特的性能，在所有测定样品中具有最高的ＮＯｘ转化率（在４５０℃时达到６９％），当有水蒸汽存在时，其活性没有下降，反而有所增加，４５０℃时 |
| 英文摘要: |
| Selective catalytic reduction of nitrogen oxides(NO x ) from diesel engine exhausts in presence of water vapour over metaloxide and perovskite\|ZSM\|5 catalysts using ammonia as a reductant have been studied. Zeolite ZSM\|5(Si/Al=20) is a poor catalyst for the reduction of NO x with ammonia in presence of O\-2 , but when loaded with metals like Cu, Fe, Cr and Ni, it behaves as active catalysts for NO x \|reduction. Cu/ZSM\|5 shows higher activity than other metal/ZSM\|5 catalysts, both with and without water vapour. It is observed that NO x \|conversion has dropped in presence of water vapour, while the selectivity to N\-2 increase. But Cu/ZSM\|5 is an exception, its activity does not drop, but slightly increases. Peroviskites, such as LaFeO\-3/ZSM\|5, LaCoO\-3/ZSM\|5 and LaNiO\-3/ZSM\|5, prepared by coprecipitation and coated on cordierite honeycomb, show high activity for NO x \|reduction and low N\-2O formation, indicating high selectivity to N\-2. Especially in presence of water vapour, the by\|product, N\-2O, is hardly formed. This is very advantageous of NO x selective catalytic reduction, for the by\|product, N\-2O can be formed over many effective catalysts. It is probable, that according to synergetic effect, the two catalysts, Cu/ZSM\|5 and LaFeO\-3/ZSM\|5, may be combined into one efficient catalyst, Cu\|LaFeO\-3/ZSM\|5, which may possess high activity, anti\|water property and high selectivity. |
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