镍基气凝胶催化CH_4-CO_2重整制取合成气反应的研究 Ⅰ.制备方法对NiO-CeO_2-Al_2O_3催化剂物化性质的影响  

STUDY OF NICKEL-BASED AEROGEL CATALYZING CO_2 REFORMING OF CH_4 TO SYNTHESIS GAS Ⅰ. STRUCTURAL PROPERTIES OF NiO-CeO_2-Al_2O_3 SYSTEM PREPARATED BY DIFFERENT METHODS

作　　者：陈吉祥[1] 王日杰[1,2] 李玉敏[1] 张继炎[1,2] 

机构地区：[1]天津大学化工学院催化科学与工程系 [2]一碳化学与化工国家重点实验室,天津300072

出　　处：《燃料化学学报》2001年第6期514-518,共5页Journal of Fuel Chemistry and Technology

基　　金：国家教委博士点专项基金 ( 970 0 5 617);一碳化工国家重点实验室基金 (KF980 0 9)~~

摘　　要：采用浸渍法、溶胶 凝胶过程与普通干燥、超临界干燥过程相结合的方法制备了具有不同结构特点的NiO CeO2 Al2 O3催化剂 ,分别为浸渍型催化剂 (iNCA)、干凝胶催化剂 (xNCA)和气凝胶催化剂 (aNCA) ,利用BET、TEM、XRD、TPR、NH3 TPD、H2 TPD等方法对各催化剂样品的物化性质进行了考察。研究结果表明 ,经 82 3K焙烧后 ,镍含量为 9%的各催化剂样品中镍物种均分散良好 ;与iNCA相比 ,以溶胶 凝胶法为基础制备的xNCA和aNCA中镍物种与载体的相互作用强并且存在状态均一 ;三种催化剂中 ,气凝胶样品具有比表面积高、堆密度低、表面酸中心数多及表面镍分散度高的特点。Using the technologies of impregnation,sol gel and the combination of sol gel and supercritical drying, the catalyst samples comprised of NiO, CeO 2, and Al 2O 3 have been prepared, and in sequence they are impregnation sample(iNCA),xerogel sample(xNCA),aerogel sample(aNCA) Every sample has been characterized by means of BET,TEM,XRD,TPR,NH 3 TPD and H 2 TPD When the catalyst samples are calcined in 823?K, nickel species disperses very well, but have more uniform and stronger interaction with support in xerogel sample and aerogel sample than that of in impregnation sample Compared with impregnation sample and xerogel sample, the aerogel sample has higher specific surface area,lower bulk density,more and stronger acidic centers,higher degree of dispersion of nickel species and better thermal stability

关 键 词：溶胶-凝胶法 超临界干燥 CH4 CO2 甲烷 NIO CEO2 Al2O3 催化剂 氧化镍 氧化铈 二氧化碳 合成气 氧化铝 

分 类 号：TE665.3[石油与天然气工程—油气加工工程] O643.36[理学—物理化学]