金属氧化物对CO还原NO反应的催化作用  

The Catalytic Performance of Several Metallic Oxides and Complex Metallic Oxides on Reaction of CO Reducing NO

作　　者：徐春保[1] 吴胜利[1] 苍大强[1] 寿秋爽 李敏[1] 邓勇 

机构地区：[1]北京科技大学冶金学院

出　　处：《环境科学》1999年第1期20-32,共13页Environmental Science

基　　金：国家教委留学人员回国基金

摘　　要：采用固定床流动反应器，研究ＣｕＯ、Ｃｒ２Ｏ３、ＭｎＯ２、Ｆｅ２Ｏ３、Ｎｉ２Ｏ３等单元金属氧化物及它们形成的复合氧化物对ＣＯ还原ＮＯ反应的催化活性．结果表明，在５００℃８００ｍｌ／ｍ３ＮＯ－０．２％ＣＯ－２．０％ＣＯ２－Ｎ２气氛中ＣＯ还原ＮＯ的能力很小，稳定还原率（ＳＲＲ）仅为１．５０％．所有单元金属氧化物及复合氧化物对ＣＯ还原ＮＯ反应均表现出一定的催化活性，Ｆｅ２Ｏ３、Ｎｉ２Ｏ３、Ｆｅ－Ｎｉ－Ｏｘ、Ｎｉ－Ｃｕ－Ｏｘ、Ｎｉ－Ｃｕ－Ｍｎ－Ｏｘ等对该反应表现出较高的催化活性，ＳＲＲ值分别为１００．００％，９６．１０％，１００．００％，１００．００％和１００．００％．初步探讨了金属氧化物对ＣＯ还原ＮＯ反应的催化机理符合Ｒｅｄｏｘ机理．The catalytic activities of CuO,Cr 2O 3,MnO 2,Fe 2O 3 and Ni 2O 3 and the complex metallic oxides formed by the single oxides on reduction of NO by CO,were studied in a packed bed reactor.The results showed that in the atmosphere of 800ml/m 3 NO 0 2% CO 2 0% CO 2 N 2 with the preheating temperature of 500℃ it was difficult to reduce NO by CO,with the stable reduction ratio (SRR) of NO only 1 5%.All metallic oxides and complex metallic oxides used in the present experiments gave certain catalytic effect on reduction of NO by CO.Fe 2O 3,Ni 2O 3,Fe Ni O x ,Ni Cu O x and Ni Cu Mn O x showed high ctalytic activities on reduction of NO by CO,with SRR 100 00%,96 10%,100 00%,100 00% and 100 00% respectively.At the same time,the mechanism of catalytic reaction of CO reducing NO on the surface of metallic oxide was also discussed to comply with Redox mechanism.

关 键 词：金属氧化物 催化 一氧化碳 一氧化氮 废气处理 

分 类 号：X701[环境科学与工程—环境工程]