| BaFeO_(3-x)与Cu-ZSM-5耦合催化剂的NO_x储存还原性能 |
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| 作者单位： | 1. Tianjin Key Laboratory of Applied Catalysis Science & Technology, School of Chemical Engineering & Technology, Tianjin University, Tianjin 300072, P. R. China;
2. The Collaborative Innovation Center of Chemistry and Chemical Engineering of Tianjin, Tianjin 300072, P. R. China |
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| 基金项目： | The project was supported by the National Natural Science Foundation of China (U1162103, U1232118), Program for New Century Excellent Talents in University of China (NCET-10-0615), Scientific Research Foundation for the Returned Overseas Chinese Scholars, Ministry of Education of China (2011-1568). |
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| 摘 要： | 为替代传统的贵金属基NOx储存还原(NSR)催化剂,本文设计并制备了不含贵金属的BaFeO3-x+CuZSM-5耦合催化剂,用于催化消除稀燃发动机尾气中的NOx.在稀燃阶段,NO在BaFeO3-x催化剂上发生了氧化和储存反应;在富燃阶段,从BaFeO3-x催化剂中脱附出来未能消除的NOx被置于其后的Cu-ZSM-5催化剂进一步催化消除.实验结果表明,BaFeO3-x+Cu-ZSM-5耦合催化剂的工作温度窗口被拓宽到250-400°C,同时NOx消除性能得到了显著提高:NOx转化率最高可达98%,N2选择性接近100%.
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| 关 键 词： | 稀燃 耦合催化剂 氮氧化物 储存 还原 |
| 收稿时间： | 2014-04-11 |
NOx Storage Reduction Performance of Coupled BaFeO3-x+Cu-ZSM-5 Catalyst |
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| Authors: | Lü Jiao-Long LI Feng-Li LI Xin-Gang |
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| Institution: | 1. Tianjin Key Laboratory of Applied Catalysis Science & Technology, School of Chemical Engineering & Technology, Tianjin University, Tianjin 300072, P. R. China;
2. The Collaborative Innovation Center of Chemistry and Chemical Engineering of Tianjin, Tianjin 300072, P. R. China |
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| Abstract: | A BaFeO3-x+Cu-ZSM-5 coupled catalyst was designed and synthesized to eliminate the NOx emitted from lean-burn exhausts, providing an alternative to the traditional noble-metal-based NOx storage reduction (NSR) catalysts. During the lean-burn period, the NO oxidation and storage processes mainly occurred over the BaFeO3-x catalyst. During the fuel-rich period, the released NOx from the BaFeO3-x catalyst was further reduced over the Cu-ZSM-5 catalyst. Our results show that, compared with the BaFeO3-x and Cu-ZSM-5 catalyst alone, the operating temperature window of the coupled BaFeO3-x+Cu-ZSM-5 catalyst is extended from 250 to 400 ℃, and its NOx elimination performance is significantly improved. The maximum NOx conversion of the coupled catalyst was 98%, while the N2 selectivity was close to 100%. |
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| Keywords: | Lean-burn Coupled catalyst NOx Storage Reduction |
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