摘要
采用原位红外、程序升温脱附、脉冲表面反应技术研究了ＣｅＯ２还原表面在中温变换反应条件下表面物种的生成及脱附，并根据研究结果归纳出水煤气变换反应机理．
he adsorption and the behavior of catalytic water gas shift reaction onthe surface of CeOx(1. 5≤x≤2. 0) were studied by means of in situ FT-IR,temperature-programmed desorption (TPD) and pulsed surface reaction (PSR) techniques. It is found that the hydroxyl groups on the surface react with CO to produce formate species at moderate temperature. The formatespedes is then oxidized by lattice oxygen ion and the' unidentate formatespecies is formed. The FT-IR and TPD results demonstrate that the inorganic carboxylate, the bidentate carbonate and the bridged carbonate can beformed on the surface at lower temperature. These carbonates can convertinto unidentate carbonate at higher temperature. Bridged carbonate is stable. The results of FT-IR, TPD and PSR show that H2 formation on thesurface of partially reduced CeO2 proceeds via. the reaction of CO with the surface hydroxyls which first produces formate species and then the formate species decompose to form H2 and CO2. The rate of aforesaid reaction agrees with the decomposition rate of the formate species.
出处
《催化学报》
SCIE
CAS
CSCD
北大核心
1996年第2期123-127,共5页
基金
国家自然科学基金
催化基础国家重点实验室基金
