Pd-ZrO_2/Al_2O_3催化剂对丙烯选择性催化还原NO的催化活性研究  

Selective Catalytic Reduction of NO with Propylene over Pd-ZrO_2/Al_2O_3 Catalysts

作　　者：王玉东[1,2] 张豪杰[2] 何丹农[1,2] 

机构地区：[1]上海交通大学,材料科学与工程学院,上海200240 [2]纳米技术及应用国家工程研究中心,上海200241

出　　处：《无机材料学报》2011年第3期311-316,共6页Journal of Inorganic Materials

基　　金：国家科技支撑计划(2007BAJ03B00)~~

摘　　要：采用浸渍法制备了具有高比表面积的氧化铝负载的Pd-ZrO2复合物催化剂(Pd-ZrO2/Al2O3),利用BET、XRD、TEM等手段研究了该复合物催化剂的物理特性,并重点研究了该复合物催化剂对以C3H6为还原剂选择性催化还原(SCR)NO的催化反应活性,分别讨论了反应温度、组分、焙烧温度、原料气组分、空速等因素对该催化反应的影响.结果发现,少量的Pd纳米粒子均匀分散于载体氧化铝上,添加适量ZrO2后,所制备的低负载量的Pd(1wt%)-ZrO2(2wt%)/Al2O3复合物催化剂具有较高的NO选择性催化还原反应活性,在240～250℃可使NO的转化率达到50%～70%.其活性提高的机制在于适量ZrO2的添加增强了反应物中NO和C3H6在催化剂表面的吸附,同时与Pd催化剂形成一种协同催化作用.An alumina supported Pd-ZrO2 catalyst with high surface area was synthesized by impregnation method and characterized by BET,XRD and TEM techniques.The catalytic activity of the catalyst on selective catalytic reduction（SCR） of NO with C3H6 as reducer was studied,and the influence of the reaction temperature,catalyst component,calcination temperature,reactant ratio and space velocity on the catalytic activity were investigated,respectively.The results indicated that the Pd nano-particles dispersed evenly on the Al2O3 support,and adding with appropriate amount of ZrO2,the obtained compound catalyst 1wt%Pd-2wt%ZrO2/Al2O3 showed high catalytic activity on NO selective catalytic reduction reaction,and the NO conversion could reach 50wt% 70wt% in the temperature range of 240 250℃.The improvement of NO conversion is ascribed to the ZrO2 loaded on the catalysts,which can promote the adsorption of NO and C3H6 on the catalyst surface,a synergetic catalytic effect between Pd and ZrO2.

关 键 词：选择催化还原 丙烯 NO转化率 二氧化锆 

分 类 号：X511[环境科学与工程—环境工程]