Research On The Reaction Of NO+CO Over Cu/SiO₂ Catalyst

NO_x is one of the major pollutants in the atmosphere, and the abatement of NO_x has been a hotspot of study all over the word. Catalytic reduction of NO with CO is considered to be one of the most important reaction for NO_x control. But most of employed DeNO_x catalysts-noble metals catalysts are now facing the crisis of resource scareity, therefor, in recent years, studies with transition metals have attracted much attention.The literature reported more about the catalysts using SiO₂ as carrier which were prepared by the impregnation method and the chemisorption-hydrolysis mehod. Moreover, as the pure catalysts which were loading mono-metal have some defeacts, they also have been modified by some methods to imporve catalytic activities.On the basis of laboratory's early work, we pepared a series of catalysts and tested in the catalytic removal reaction of NO and CO simultaneously. The effort of the pretreatment atmosphere, preparation method, GHSV, the calcined temperature and the rare earth as promoter on the catalytic of Cu/SiO₂ were investigated and some useful conclusions shows as follows:1. Preparation methods and pretreatment atmosphere have great effect on the catalytic activities. In this paper, we founded that Cu/SiO₂ prepared by chemisorption-hydrolysis mehod and pretreated with H₂ have better activity through the catalysts pretreated with H₂﹑ He﹑ NO/He﹑ CO/He and NO+CO/He.2. The calcined temperature to the carrier has great effect on the catalytic activities. In this paper, we founded that the catalysts which were calcined by 500℃to the carriers have high activities.3. Addition of rare earth as promoter greatly improved the activity of Cu/SiO₂ in NO+CO reaction. In this paper, we founded that Nd is the best one in this reaction and the promoter is structure promoter.