SnO2—Al2O3复合氧化物催化剂的一氧化氮选择催化还原性能

采用双股并流共沉淀方法制备的锡铝复合氧化物，对有氧条件C3H6选择还原NO反应有较高的催化活性和较宽的反应温度区间。具有最佳配比（Sn:Al(摩尔比）＝1：1.94）的锡铝复合氧化物样品，在反应温度350℃时可使NO转化率达71％，XRD、H2－TPR及NH3－TPD的研究结果表明，锡与铝难以形成氧化物固溶体， 而SnO2是以微晶形态分散于无定形的Al2O3上，Al2O3的中等强度酸性与SnO2微晶适度的氧化还原性能相结合，使锡铝复合氧化物具有较高的催化活性。

Selective Catalytic Reduction of NO with C3H6 over SnO2-Al2O3 Binary Metal Oxide Catalysts

SnO2-Al2O3 binary metal oxide prepared by co-current co-precipitation (CCP) method shows good performance for the selective reduction of NO by C3H6 in a broad temperature window. For the sample with Sn∶Al (mol/mol)=1∶1.97 at 350 ℃, 71% conversion of 1.186×10-3 NO to N2 was attained in the presence of 9.48×10-4 C3H6 and 2.23% O2 in He, at a space velocity of 15 000 h-1. Using XRD, H2-TPR and NH3-TPD analysis, we found that the SnO2/Al2O3 binary oxide seems to be SnO2 micro-crystal dispersed on the amorphous γ-Al2O3, and the synergic effect of acidity of Al2O3 and oxidizability of SnO2 led to the improvement of the catalyst activity.