Ce对Cu基氧氯化催化剂稳定性的影响  

Influence of Cerium on the Stability of Copper-Based Oxychlorination Catalyst

作　　者：陈智涛[1] 韩明汉[1] 王德峥[1] 魏飞[1] 

机构地区：[1]清华大学化工系绿色反应工程与工艺北京市重点实验室,北京100084

出　　处：《催化学报》2008年第10期951-953,共3页

基　　金：国家重点基础研究发展计划(973计划;2009CB219901);国家自然科学重点基金(20436050)

摘　　要：通过ICP-AES和XRD等表征手段,考察了稀土金属Ce化合物对Cu基氧氯化催化剂活性及稳定性的影响.研究表明,Ce在反应初期转变成的CeO2具有储存和传递氧的功能,从而提高催化剂的活性.在400℃反应300h后,催化剂的活性显著下降,其原因是由于86%的Ce与载体发生作用,生成难溶的物质,失去助催化的作用.同时,随着反应的进行,CeO2晶相晶粒长大也造成催化剂活性下降.The influence of the presence of cerium in the copper-based catalyst for HC1 oxychlorination was investigated by ICP-AES and XRD characterization. Cerium chloride was transformed to cerium oxide at the beginning of the reaction, which supplied oxygen for the reaction. The catalyst was deactivated during a 300 h duration test. This was because 86 % of the cerium had reacted with the carrier to form an inert phase. CeO2 crystallites also grew during the reaction, which also led to the deactivation of the copper-based catalyst.

关 键 词：氧氯化 铈 铜基催化剂 载氧 失活 

分 类 号：O643.36[理学—物理化学]