摘要
用漫反射傅里叶红外光谱法研究了Ｎｉ－Ｒｕ－稀土／ＺｒＯ２多组分催化体系作用下的二氧化碳甲烷化反应机理．结果表明，碳酸根、甲酸根和一氧化碳是催化剂表面可以检出的吸附物种，其中表面的含氧酸根类物种是催化反应的主要中间物．二氧化碳通过与载体表面羟基的作用转化为含氧酸根类物种吸附于催化剂表面，并进一步氢解为甲烷．反应中生成的少量一氧化碳可能来源于表面含氧酸根氢解为甲烷的副反应．含不同稀土的多组分催化剂作用下的二氧化碳甲烷化过程有相同的反应机理．
The mechanism for the methanation of carbon dioxide over Ni Ru rare earth catalysts supported on zirconia is studied by means of diffuse reflectance Fourier transform infrared spectroscopy. The results show that the adsorbed carbonate, formate and carbon monoxide are the surface species which can be detected. The surface carbonate and formate are the main reaction intermediates formed through the reaction of carbon dioxide with surface hydroxyl group on catalyst support and are further hydrogenated to methane. No other surface species are detected. A small amount of carbon monoxide is formed probably in the secondary reaction of the hydrogenation of surface carbonate and formate. The mechanism of the methanation reaction over different three component catalysts is the same.
出处
《催化学报》
SCIE
CAS
CSCD
北大核心
1997年第3期189-193,共5页
基金
广东省自然科学基金
关键词
二氧化碳
甲烷化
稀土
二氧化锆
担载型
催化剂
Carbon dioxide, Methanation, Rare earth, Zirconia, Supported catalyst, Reaction mechanism
