NO的催化氧化

Catalytic Oxidation of NO

采用傅里叶变换红外光谱定量分析方法研究了γ Al2 O3,TiO2 和硅胶负载的金属氧化物和贵金属催化剂对NO催化氧化反应的活性 ,考察了反应温度、活性组分负载量、空速及预氧化还原处理等因素对催化剂活性的影响 ,并以NO的催化氧化机理为基础 ,对各种因素影响机理进行了分析 .实验结果表明 ,MnO ,Cr2 O3 和Co3O4 催化剂的活性较好 ;预处理条件对贵金属催化剂Pt/Al2 O3 的活性影响较大 ;

A new method is proposed to remove NO x and SO 2 simultaneously for flue gas cleanup. NO is first oxidized to NO x(x >1 5), and then is scrubbed together with SO 2 by aqueous ammonia and recovered as fertilizer. The key step is the selectively catalytic oxidation of NO in the gas phase. By using the quantitative analysis method of FT IR, the catalytic oxidation of NO was studied. The activity of various transition metal oxide and platinum catalysts is tested on the supports of γ Al 2O 3, TiO 2, and silica gel. According to the established reaction mechanism of NO oxidation for these catalysts, the influences of temperature, active constituent loading, space velocity and pretreatment conditions are discussed. It is found that the catalysts of MnO, Cr 2O 3, and Co 3O 4 supported on γ Al 2O 3are very active for the oxidation of NO with an optimum conversion of over 50% at about 300 ℃. The pretreatment conditions have significant influence on the activity of catalyst Pt/Al 2O 3. On the support of TiO 2, the catalysts of MnO and Cr 2O 3 are also highly active. In addition, the same metal oxide catalyst on different supports displays different activity.