Liu Zhi-ming, Hao Ji-ming, Fu Li-xin, Li Jun-hua, Cui Xiang-yu
Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China.
Huan Jing Ke Xue. 2004 Jul;25(4):7-12.
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 NOx 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 H20 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.
在该研究中，通过三种不同方法（浸渍法、共沉淀法和一步溶胶-凝胶法）制备了一系列具有不同锡负载量的SnO₂/Al₂O₃催化剂，并研究了它们用丙烯选择性还原氮氧化物的催化活性。发现催化剂制备方法以及锡负载量对催化剂活性有显著影响。通过溶胶-凝胶法制备的催化剂对氮氧化物还原表现出最高活性，最佳锡负载量为5%。发现通过溶胶-凝胶法制备的5% SnO₂/Al₂O₃催化剂比通过其他方法制备的催化剂受H₂O存在的抑制作用更小。即使在H₂O和SO₂共存的情况下，它仍表现出最高活性。氧气和丙烯浓度的增加分别促进了氮氧化物的还原。
