Au/CeO_2/Y和Au-MFe_2O_4催化剂用于有氧条件下CH_4还原NO_x的研究  

Au/CeO_2/Y and Au-MFe_2O_4 Catalysts for the Selective Catalytic Reduction of NO_x with CH_4 under O_2 Atmosphere

作　　者：徐秀峰[1] 唐艳玲[1] 索掌怀[1] 齐世学[1] 安立敦[1] 

机构地区：[1]烟台大学应用催化研究所,山东烟台264005

出　　处：《分子催化》2004年第3期194-197,共4页Journal of Molecular Catalysis(China)

基　　金：中国科学院山西煤化所煤转化国家重点实验室基金资助项目(2002-2003);山东省科技攻关计划项目(2001-2004).

摘　　要：以CeO2/Y分子筛和MFe2O4(M=Ni,Co,Zn)为载体,制备了Au/CeO2/Y和Au-MFe2O4负载型金催化剂.用CH4做还原剂,考察了它们在有氧条件下催化还原NOx的活性.结果表明:在Au-Y中引入助剂Ce,使得Au/CeO2/Y的催化活性高于Au/Y;Au-CoFe2O4的催化活性高于Au-Fe2O3,反应温度为300℃时,NOx在Au-CoFe2O4上的转化率达到39.7%.Nitrogen oxides (NO_x) contribute largely to a variety of environmental problems, such as the formation of acid rain and photochemical smog. Therefore, the selective catalytic reduction (SCR) of NO_x has become one of the urgent environmental issues. In the present research, Au/CeO_2/Y and Au-MFe_2O_4 (M=Co, Ni or Zn) catalysts were prepared and their catalytic activity was measured in the SCR of NO_x with CH_4 as the reducing agent under oxygen atmosphere. The results show that the catalytic activity of Au/CeO_2/Y is higher than that of Au/Y due to the introduction of Ce into the prepared catalysts, and Au-MFe_2O_4 has a better catalytic performance than Au-Fe_2O_3, e.g. NO_x conversion over Au-CoFe_2O_4 is 39.7% at the reaction temperature of 300 ℃. On the basis of its deNO_x performance, Au-MFe_2O_4 could be considered as a promising catalyst for the reduction of NO_x emitted from some industrial sources.

关 键 词：氮氧化物 催化还原 Au/CeO2/Y Au-MFe2O4 deNOχ活性 

分 类 号：O643.32[理学—物理化学]