Cui Xiang-yu, Hao Ji-ming, Fu Li-xin, Li Jun-hua, Zhu Tian-le, Liu Zhi-ming
Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China.
Huan Jing Ke Xue. 2004 Jul;25(4):18-22.
The catalytic activities of alumina-supported Ag, Co and Cu for selective reduction of NO with propene as reductant in the presence of excess oxygen were investigated. The catalytic performances of single-component catalysts with different metal loadings and of samples prepared by various methods such as mechanical mixing, one-step impregnation, two-step impregnation, etc. were studied. The experimental results showed that the Ag exhibited the highest conversion of NO to N2 (approximately 89% with 2% loading, wt.) among single-component catalysts, the lower was Co, and the lowest was Cu. The sequence of the temperature for the maximum conversion was on the order of Cu < Co < Ag. For Ag catalysts, the activities between samples of identical loadings prepared by one-step and two-step impregnation were almost the same. The activities of mixed samples were not the simple sum of the single-component catalysts. The mixed Ag-Co sample possessed the highest activity (80% above). The activities of the combinatorial samples declined comparatively to some extent. The activities of one-step impregnation samples descended more markedly and the highest conversion was only over 30%.
研究了氧化铝负载的银、钴和铜在过量氧气存在下以丙烯为还原剂选择性还原NO的催化活性。研究了不同金属负载量的单组分催化剂以及通过机械混合、一步浸渍、两步浸渍等各种方法制备的样品的催化性能。实验结果表明，在单组分催化剂中，Ag对NO转化为N2的转化率最高（2%负载量，重量比时约为89%），Co次之，Cu最低。最大转化率对应的温度顺序为Cu < Co < Ag。对于Ag催化剂，通过一步浸渍和两步浸渍制备的相同负载量样品之间的活性几乎相同。混合样品的活性不是单组分催化剂活性的简单加和。Ag-Co混合样品具有最高的活性（高于80%）。组合样品的活性有一定程度的下降。一步浸渍样品的活性下降更为明显，最高转化率仅超过30%。
