Pd-Cu/凹凸棒石黏土催化剂催化CO氧化性能  

Catalytic performance of Pd-Cu/attapulgite clay catalyst for CO oxidation

作　　者：王永钊[1] 张卓[1] 李凤梅[1] 赵永祥[1] 

机构地区：[1]山西大学化学化工学院,精细化学品教育部工程研究中心,山西太原030006

出　　处：《工业催化》2011年第11期75-79,共5页Industrial Catalysis

基　　金：山西省青年科技研究基金(2010021008-3)资助项目

摘　　要：以凹凸棒石黏土(APT)作载体,采用浸渍法制备双金属催化剂Pd-Cu/APT、单金属催化剂Pd/APT和Cu/APT,在连续流动微反装置上考察催化剂的CO催化氧化活性,采用N_2物理吸附/脱附、X射线粉末衍射和程序升温还原/脱附等手段对催化剂进行表征。结果表明,Pd-Cu/APT催化剂中Cu主要以CuCl形式存在,Pd高度分散与Cu之间产生了明显的相互作用,使Cu物种的还原温度大幅降低;经水蒸汽预处理增强了Pd-Cu/APT催化剂表面酸性,促进了催化活性的提高。在CO体积分数为0.5%、水蒸汽体积分数3.3%、空速6 000h^(-1)和常温反应条件下,CO转化率可达90%以上。Using attapulgite clay（APT） as the support,the bimetallic Pd-Cu/APT catalyst, monometallic Pd/APT and Cu/APT catalysts were prepared by wet impregnation method. The catalytic activities of the catalysts for CO oxidation were investigated in a fixed-bed continuous flow reactor and characterized by Nz physisorption, XRD, I-I2-TPR and NH3-TPD. The result of XRD showed that Cu species in Pd-Cu/APT catalyst existed mainly in the form of CuC1 phase. There existed obvious interaction between Cu species and highly dispersed Pd species in Pd-Cu/APT catalyst. The TPR results indicated that the reduction tem- perature of Cu species were reduced due to the stronger interaction between Pd and Cu. NH3-TPD charac- terization showed that surface acidity of the catalyst was enhanced after the pretreatment of water vapor. As a result, the catalyst exhibited excellent performance for CO oxidation. CO conversion of 90% on Pd-Cu/ APT catalyst was attained under the reaction condition of 0.5vo1% CO, GHSV 6 000 h -~ ,3.3vo1% water vapor and room temperature.

关 键 词：催化化学 凹凸棒石黏土 Pd—Cu/APT催化剂 CO催化氧化 

分 类 号：O643.36[理学—物理化学] TQ426.6[理学—化学]