| 富氧条件下在Ag/Al2O3催化剂上C3H6选择性还原NO |
| 摘要点击 1030 全文点击 1276 投稿时间：1999-07-22 |
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| 中文关键词 Ag/Al2O3 催化剂 氮氧化物还原 CO 溶胶-凝胶法 |
| 英文关键词 silver/alumina,catalyst,nitric oxide reduction,carbon monoxide,sol gel. |
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| 中文摘要 |
| 比较富氧条件下，Ｃ3Ｈ6 在溶胶－凝胶和浸渍２种方法制备的Ａｇ／Ａｌ2Ｏ3 催化剂上还原ＮＯ的活性和热稳定性． 结果表明，从活性角度考虑，采用溶胶－凝胶法制备Ａｇ／Ａｌ2Ｏ3 催化剂时，最佳Ａｇ 负载量（ｗｔ）为４％ ～６％ ，其最大活性与浸渍法制备的２％ Ａｇ／Ａｌ2Ｏ3 催化剂相同，而溶胶－凝胶法制备的催化剂有更宽的活性温度范围． 随着焙烧温度提高，溶胶－凝胶法制备的Ａｇ／Ａｌ2Ｏ3 催化剂的比表面和活性下降比浸渍法慢．此外，还考察了气氛中含有ＣＯ对Ａｇ／Ａｌ2Ｏ3 催化剂活性的影响，结果表明活性降低，其原因可能是活性高的氧化态Ａｇ 被ＣＯ部分还原为活性低的还原态Ａｇ． |
| 英文摘要 |
| The catalytic activity and thermal stability of the Ag/Al2O3 catalysts prepared respectively by the sol gel and soak methods were compared when these catalysts were used in the selective reduction reaction of NO using C 3H 6 as reductant in the presence of excess oxygen.The results showed that the Ag/Al2O3 catalysts prepared by the sol gel method,as far as the activity is concerned,had an optimal metal loading(wt) of about 4%～6% Ag,whose largest activity was the same as that of the 2% Ag/Al2O3 catalyst prepared by the soak method.However,the catalysts prepared by the sol gel method had a broader activity range.As the calcination temperature rose,the specific surface area and activity of Ag/Al2O3 catalyst prepared by the sol gel method decreased more slowly than those of the Ag/Al2O3 catalyst prepared by the soak method.In addition,the study also indicated that the activity of the Ag/Al2O3 catalyst reduced in the presence of CO,which was attributed to reduction of the oxidized Ag with CO. |
