制备条件对Pd催化剂上C_3H_6选择性还原NO性能的影响  

Effect of Preparation Methods on Pd Catalysts for Selective Catalytic Reduction on NO by Propene

作　　者：刘振林[1] 伏义路[1] 

机构地区：[1]中国科学技术大学化学物理系,安徽合肥230026

出　　处：《分子催化》2001年第2期81-85,共5页Journal of Molecular Catalysis(China)

基　　金：中国-福特研究和发展基金资助项目!( No.9712 3 0 1)

摘　　要：采用浸渍法和溶胶凝胶法 ,制备了 Pd/ Al2 O3和 Pd/ Al2 O3- Ce O2 样品 ,并测定了不同温度焙烧后催化剂的物相、比表面积及对丙烯选择性还原 NO的活性 .对于 Pd/ Al2 O3,随着焙烧温度的提高 ,其 NO的最大转化率逐渐下降 ,对应的反应温度在 2 90～ 310℃左右 ,而溶胶凝胶法制备的样品活性略高于浸渍法制备的样品 ;对于Pd/ Al2 O3- Ce O2 ,经 6 0 0℃焙烧后 ,其 NO的最大转化率为 2 2 % ,90 0℃焙烧的催化剂样品上 NO的最大转化率达到 40 %左右 ,对应的反应温度也逐渐下降 ,说明活性随焙烧温度的提高而明显提高 .溶胶凝胶法和浸渍法制备的样品结果很接近 .用浸渍法制备了若干不同 Pd负载量的 Pd/ Al2 O3样品 ,活性测定的结果表明 ,Pd含量在 0 .5 %左右的催化剂样品具有最高的活性 .Some Pd/Al 2O 3 and Pd/Al 2O 3\|CeO 2 catalysts were prepared by impregnation and sol\|gel methods. After calcined at different temperatures and reduced in H 2 stream at 500 ℃, the catalysts went through activity test for NO x selective catalytic reduction by propene. For Pd/Al 2O 3, the highest NO conversion drops with the increase of calcination temperature; and the samples prepared by sol\|gel method give better performance than those by impregnation method. For Pd/Al 2O 3\|CeO 2 calcined at 600 ℃, the highest NO conversion is 22%, while it reaches 44% after calcination at 900 ℃. Samples prepared by impregnation method have similar results as those by sol\|gel method. Calcination greatly increases the activity of Pd/Al 2O 3\|CeO 2 catalysts. Some Pd/Al 2O 3 catalysts with different Pd loadings were also prepared by impregnation method, and the activity tests show that the sample with about 0.5% Pd loading has the highest activity.

关 键 词：焙烧温度 负载量 选择性还原 铯催化剂 丙烯 一氧化氮 制备条件 氧化铝负载 

分 类 号：TQ426.81[化学工程] O613.61[理学—无机化学]