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实验采用Ag2 O ,Ag3 0 Si70 合金和Ag离子交换的ZSM 5分子筛 ,研究了NO的直接催化分解和以CO ,NH3 等作为还原剂的选择还原反应 .结果表明 ,在合适的条件下 ,实验中采用的Ag基催化剂均具有一定的NO分解活性 .当反应温度低于 80 0K时 ,NO在AgZSM 5上的直接分解给出了近 2 0 %的N2 转化率 ;相似条件下 ,适量CO和NH3 的加入大大提高了反应的活性和催化剂寿命 .氧的存在促进了NO在催化剂表面的吸附 ,从而导致了选择还原温度的降低 .当气相中氧气大大过量 (O2 ∶H2 O =18∶1) ,反应温度为 6 0 0K时 ,NO在Ag ZSM 5催化剂上氨还原生成N2 的转化率仍能达到近 70 %
In the experiment, ZSM 5 zeolite exchanged with Ag 2 O, Ag 3 O Si 70 alloy and Ag ion was used to study the direct catalytic decomposition of NO and the selective reduction reaction with CO and NH 3 as reductants.The results showed that under the proper conditions, The Ag-based catalysts have some NO decomposition activity.When the reaction temperature is lower than 80 0K, the direct decomposition of NO on AgZSM 5 gives a nearly 20% conversion of N2; under similar conditions, the appropriate amount of CO and NH3 Greatly increases the activity of the reaction and the life of the catalyst.The presence of oxygen promotes the adsorption of NO on the surface of the catalyst and leads to the reduction of the selective reduction temperature.When the oxygen in the gas phase is greatly overdosed (O2: H2O = 18: 1) When the reaction temperature is 600 K, the conversion of NO to N2 on Ag ZSM 5 catalyst can still reach nearly 70%