载体制备工艺对Pt/CA催化剂甲醇氧化催化性能的影响  

Effect of Support Preparation on Catalytic Property of Pt/CA for Methanol Electrooxidation

作　　者：原鲜霞[1] 杜娟[1] 夏小芸[1] 巢亚军[1] 马紫峰[1] 

机构地区：[1]上海交通大学化学工程系,上海200240

出　　处：《高校化学工程学报》2008年第1期38-43,共6页Journal of Chemical Engineering of Chinese Universities

基　　金：国家973项目(2007CB209705);国家自然科学基金项目(20776085;20471037;20476055);上海市科委项目(06SN07115;065211020)

摘　　要：比较研究了炭气凝胶(CA)的制备工艺条件对其表面微观结构及以其为载体的催化剂Pt/CA甲醇氧化催化活性的影响。结果表明,常压干燥制得的CA表面以微孔为主,而超临界CO2干燥制得的CA表面主要以中孔为主,而且比表面积、表面孔容和平均孔径更大;超临界CO2干燥比常压干燥更适合制备高活性甲醇氧化Pt/CA催化剂的载体材料;CA制备过程中催化剂Na2CO3的用量(常用R/C表示,其中R代表制备CA的原料间苯二酚,C代表制备CA的催化剂Na2CO3)为200至1000的范围内,R/C的增大会引起超临界CO2干燥制得CA的表面平均孔径随之增加,R/C为300时制得的CA具有最大的BET比表面积和表面孔容,以其为载体制得的催化剂具有最好的甲醇氧化催化性能。Effects of preparation process on the microstructure of carbon aerogel （CA） and catalytic property of CA supported Pt catalyst for methanol electrooxidation were comparatively studied. The results show that the ambient pressure drying leads to CA with micropores, while the CA prepared with supercritical CO2 extraction （SCE） is mainly macroporous and has larger specific surface area, pore volume and average pore size. Therefore the SCE is more appropriate than ambient pressure drying for the preparation of support material for methanol electrooxidation catalyst with high activity. When the used amount of catalyst Na2CO3 for the preparation of CA is expressed as molar ratio of resorcinol to Na2CO3 and noted as R/C, increase of R/C in the range of 200 to 1000 will lead to increase of the average pore size on the surface of CA prepared with SCE, and it was found that the R/C of 300 is most suitable for preparing support material of methanol electrooxidation catalyst with the best catalytic performance.

关 键 词：炭气凝胶 制备工艺条件 微观结构 Pt/CA催化剂 甲醇氧化 

分 类 号：TM911.4[电气工程—电力电子与电力传动] O648.17[理学—物理化学]