Al_2O_3负载镍基催化剂上CO_2氢甲烷化研究  

Methanation of Carbon Dioxide by Hydrogenating over Ni Supported on Al_2O_3 Catalysts

作　　者：费金华[1] 侯昭胤[1] 齐共新[1] 郑小明[1] 

机构地区：[1]浙江大学催化研究所,杭州310028

出　　处：《高等学校化学学报》2002年第3期457-460,共4页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金 (批准号 :2 0 173 0 48);浙江省自然科学基金 (批准号 :ZD990 3 )资助

摘　　要：通过对 Ni/Al2 O3及添加 Ce O2 的 Ni/Al2 O3催化剂上 CO2 氢甲烷化反应的研究发现 ,在反应过程中 ,该体系的催化剂上并不产生 CO,添加 Ce O2 后能显著提高甲烷产率 .原位漫反射红外光谱研究发现 ,甲烷可通过表面 CO- 2 物种加氢或表面甲酸盐加氢两种途径产生 ,且第二种途径更有效 ;添加 Ce O2 可通过在较低温度时形成较多的表面甲酸盐来提高 CO2Methanation of carbon dioxide by hydrogenating over Ni/Al\-2O\-3 and Ni\|CeO\-2/Al\-2O\-3 catalysts was investigated by methods of reaction and \%in\|situ \%diffuse reflectance FTIR(\%in\|situ\% DRFTIR). The results showed that carbon monooxide was not the product over those catalysts whether CeO\-2 was added or not, but the yield of methane was increased with CeO\-2 addition. At 300 ℃, the yield of methane over \{Ni\|CeO\-2/\}Al\-2O\-3 catalysts was two times higher than that over Ni/Al\-2O\-3 catalysts. The DRFTIR results showed that methane came from two processes, which were hydrogenation of CO\+-\-2 species and formate species over the catalysts. The more effective species was formate on the surface of catalyst. The reason why the activity of Ni/Al\-2O\-3 catalyst was promoted by addition CeO\-2 was that a large amount of formate forms over Ni\|CeO\-2/Al\-2O\-3 catalyst.

关 键 词：NI/AL2O3 CEO2 催化剂 CO2 加氢 甲烷 二氧化碳 甲烷化 催化活性 氧化铈 三氧化二铝 负载 镍基催化剂 助剂 

分 类 号：O623.11[理学—有机化学] O643.361[理学—化学]