| 富氧条件下SnO2/Al2O3催化剂上丙烯选择性还原NOx的研究 |
| 摘要点击 2141 全文点击 2085 投稿时间：2003-09-23 修订日期：2003-11-26 |
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| 中文关键词 SnO2/Al2O3 浸渍法 共沉淀法 溶胶凝胶法 NOx的还原 |
| 英文关键词 SnO2/Al2O3 impregnation co-precipitation sol-gel method NOx reduction |
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| 中文摘要 |
| 考察了分别用浸渍法、共沉淀法和溶胶-凝胶法制备的SnO2/Al2O3催化剂上丙烯选择性还原NOx的催化活性,发现制备方法与Sn的负载量对其活性有重要影响.溶胶-凝胶法制备的SnO2/Al2O3催化剂活性最高,Sn的最佳负载量为5%.与浸渍法和共沉淀法制备的5%SnO2/Al2O3催化剂相比,溶胶-凝胶法制备的5%SnO2/Al2O3催化剂受水蒸汽的抑制作用较弱,并且在水和SO2共存的条件下活性最高.此外,反应气中丙烯及氧气浓度的增加有利于NOx转化率的提高.
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| 英文摘要 |
| In the study, a series of SnO2/Al2O3 catalysts with various Sn loading were prepared by three different methods (impregnation, co precipitation and single step sol gel) and their catalytic activities for the selective reduction of NOx with propene were investigated. It was found that the catalyst preparation method as well as the Sn loading exerted a significant influence on the catalyst activity. Catalysts prepared by sol gel method exhibited the highest activity toward NO x reduction and the optimal Sn loading is 5%. 5%SnO2/Al2O3 catalyst prepared by sol gel method was found to be less inhibited by the presence of H2O than those prepared by other methods. Even in the co presence of H2O and SO2, it still showed the highest activity. The increase of oxygen and propene concentration promotes the NOx reduction, respectively. |
