首页>
外国专利>
Catalyst and Catalyst Structure for Reduction of Nitrogen Oxides, and Method for Catalytic Reduction of Nitrogen Oxides
Catalyst and Catalyst Structure for Reduction of Nitrogen Oxides, and Method for Catalytic Reduction of Nitrogen Oxides
展开▼
机译:用于还原氮氧化物的催化剂和催化剂结构,以及用于催化还原氮氧化物的方法
展开▼
页面导航
摘要
著录项
相似文献
摘要
The invention provides a catalyst and a catalyst structure for catalytic reduction of nitrogen oxides contained in exhaust gas wherein fuel is supplied and subjected to combustion under periodic rich/lean conditions and the resulting exhaust gases are brought into contact therewith, which catalyst comprises:an outer catalyst layer comprising an outer catalyst component A which comprises at least one selected from a solid acid, and a solid acid supporting oxides and/or ions of at least one element selected from vanadium, tungsten, molybdenum, copper, iron, cobalt, nickel and manganese, andan inner catalyst layer comprising an inner catalyst component which comprises at least one noble metal catalyst component B selected from platinum, rhodium, palladium and an oxide thereof and a catalyst component C comprising ceria or praseodymium oxide or a mixture of oxides and/or a composite oxide of at least two elements selected from cerium, zirconium, praseodymium, neodymium, terbium, samarium, gadolinium and lanthanum. The invention further provides a method for catalytic reduction of nitrogen oxides by contacting the nitrogen oxides with the catalyst.展开▼