摘要
通过溶胶 凝胶方法制备了尖晶石结构的La2 NiO4/Al2 O3 催化剂 ,采用BET ,XRD和TG表征了催化剂的孔分布、比表面积、体相组成以及凝胶样品的热失重和热分解过程 .将催化剂应用于CH4/CO2 重整反应制合成气 ,考察了惰性气体和反应温度对转化率、选择性以及积碳的影响 .结果表明 ,在高空速 (GHSV =4 8× 10 4ml/ (g·h) )下 ,CH4和CO2 的转化率分别为5 1%和 6 0 % ,CO和H2 的选择性约为 98%和 92 % ,惰性气体He的引入明显地提高了CH4和CO2 的转化率 .
CO 2 reforming of CH 4 over Ni based catalysts has attracted worldwide attention from both industrial and environmental sectors. However, the stability of catalyst is one of the factors that inhibits the industrialization of CH 4/CO 2 reforming. La 2NiO 4/Al 2O 3 catalyst with spinel structure was prepared by sol gel method. The pore size distribution, specific surface area and composition in the bulk of the catalyst as well as the thermal weight loss and decomposing process of gel were characterized by means of BET, XRD and TG, respectively. The catalyst was applied to CH 4/CO 2 reforming to syngas, meanwhile, the influence of inert gas, reaction temperature and time on the reactant conversion, product selectivity and carbon deposition was investigated. The results indicated that under the conditions of GHSV=4 8×10 4 ml/(g·h) and θ =700 ℃, the conversion of CH 4 and CO 2 was 51% and 60%, the selectivity for CO and H 2 was 98% and 92%, respectively. The introduction of inert gas He could obviously enhance the conversion of CH 4 and CO 2; the results of characterization showed that the addition of La 2O 3 and the formation of La 2NiO 4 spinel structure were favorable for the CO 2 activation and the coke elimination.
出处
《催化学报》
SCIE
CAS
CSCD
北大核心
2004年第1期15-18,共4页
基金
香港特区政府基金资助项目 (HKBU 2 0 5 3 /98P)
关键词
氧化镧
氧化镍
氧化铝
负载型催化剂
甲烷
二氧化碳
重整
合成气
溶胶—凝胶法
lanthanum oxide,nickel oxide,aluminum oxide, supported catalyst, methane, carbon dioxide,reforming, syngas, sol gel method
