制备方法对Ni/MgO/Al_2O_3在甲烷与二氧化碳重整反应中催化性能的影响  

Influence of Preparation Methods on Catalytic Performance of Ni/MgO/Al_2O_3 in CO_2 Reforming of CH_4

作　　者：索掌怀[1] 徐秀峰[1] 马华宪[2] 安立敦[1] 

机构地区：[1]烟台大学应用催化研究所,烟台264005 [2]山东工业大学化工系,济南250061

出　　处：《催化学报》2000年第5期411-414,共4页

基　　金：山东省教委科研基金!(J97C5 5 )

摘　　要：采用浸渍 还原法制备的Ni/MgO/Al2 O3 在CH4 与CO2 重整制合成气反应中显示出良好的催化性能和一定的抗积炭能力 ;在 10 2 3K下流动反应气氛中连续运转 10 0h ,未见活性下降 ,CH4 及CO2 转化率均为 90 %左右 ,CO收率高于 90 % .实验还发现 ,CH4 转化率随着原料气中CO2 浓度的增加而升高 ,当V(CO2 ) /V(CH4) =2时 ,CH4 转化率可达 10 0 % .通过BET比表面积测定及XRD ,TEM等分析手段 ,比较了浸渍 还原和浸渍 焙烧 还原两种制备方法对催化剂活性的影响 .结果表明 ,与浸渍 焙烧 还原法相比 ,浸渍 还原法制备的Ni催化剂在载体表面的分散更好 。MgO modified Al 2O 3 supported Ni catalysts have been prepared by novel impregnation reduction method and their catalytic performance in CO 2 reforming of CH 4 to syngas has been evaluated. The results indicate that the catalysts show high activity and high resistance to coke deposition. After reaction at 1?023 K for 100 h, the conversion of CH 4 and CO 2 was over 90% respectively with CO yield of about 90%. In addition, the CH 4 conversion increases with CO 2 amount in the feed gas, for example, CH 4 conversion of 100% is observed at 1?023 K under the condition of V (CO 2)/ V (CH 4)=2. BET surface area, XRD and TEM have been used to study the influence of preparation methods on the catalyst performance. The results reveal that the Ni/MgO/Al 2O 3 catalyst prepared by impregnation reduction method has larger surface area and smaller particle size in comparison with the catalyst prepared by impregnation calcination reduction method.

关 键 词：甲烷 二氧化碳 重整 NI催化剂 催化性能 合成气 

分 类 号：O643.3[理学—物理化学]