超细镍基催化剂上CH_4-CO_2重整反应的性能Ⅰ.制备方法对催化剂结构和还原性能的影响  

CH_4 Reforming with CO_2 over Superfine Ni-Based Catalysts Ⅰ. Effects of Preparation Methods on Structure and TPR of Catalysts

作　　者：许峥[1] 张鎏[2] 张继炎[2] 张军社[2] 

机构地区：[1]清华大学化工系,北京100084 [2]天津大学化工学院,天津300072

出　　处：《催化学报》2000年第3期234-238,共5页

基　　金：国家博士点基金资助项目!( 970 0 5 618)

摘　　要：通过BET ,XRD ,XPS ,IR和TPR等表征手段 ,考察了制备方法对CH4 CO2 重整用镍基催化剂物性结构和还原性能的影响 .与浸渍的超细载体二元NiO Al2 O3 及浸渍的普通载体三元NiO La2 O3 Al2 O3 催化剂相比 ,采用溶胶 凝胶法和超临界干燥技术制备的超细二元和三元气凝胶超细催化剂具有高表面积、高孔隙率及孔结构可控等特点 ,且组分之间的相互作用强 ,分布均匀 ,较低温度下即可形成NiAl2 O4 尖晶石结构 ,吸附能力强 ,还具有更丰富的表面缺陷和暴露原子数等纳米材料特性 .同时 ,该方法适宜于制备负载多组分金属催化剂 ,有利于发挥助剂的改善调节作用 ,满足CH4 CO2 重整反应对催化剂的要求 .The effects of preparation methods on structure and TPR profiles of Ni based catalysts for CH 4 reforming with CO 2 were investigated by means of BET, XRD, XPS, IR and TPR techniques. The superfine NiO Al 2O 3 and NiO La 2O 3 Al 2O 3 aerogel catalysts prepared by sol gel and supercritical drying (SCD) techniques possess very large surface area, low apparent density and well defined pore size distribution, compared with the ones prepared by conventional impregnation. The interaction between components in aerogel catalysts is strong enough and well distributed, leading to the formation of NiAl 2O 4 spinal at lower temperature. The stronger adsorptive power and much more surfacial defects and atoms were observed in aerogel catalysts, which can be attributed to the properties of nano particles. The binary aerogel catalyst is better than the one with superfine alumina as support, and the ternary aerogel catalyst is better than the binary one owing to the addition of La 2O 3. Therefore, the sol gel and SCD techniques are also favorable for preparation of multiple component Ni based catalysts suitable for CH 4 reforming with CO 2.

关 键 词：镍基催化剂 甲烷 二氧化碳 重整反应 合成气 

分 类 号：O643[理学—物理化学]