CO_2气氛下纳米铬铈复合氧化物乙苯脱氢行为的研究  

Dehydrogenation of Ethylbenzene over Cr-Ce-O Mixed Oxides in the Presence of CO_2

作　　者：叶兴南[1] 华伟明[1] 乐英红[1] 缪长喜[2] 高滋[1] 

机构地区：[1]复旦大学化学系分子催化与功能材料实验室 [2]上海石油化工研究院,上海201208

出　　处：《复旦学报（自然科学版）》2003年第6期975-978,983,共5页Journal of Fudan University：Natural Science

基　　金：973"国家重点基础发展规划资助项目(G2000077507);上海石油化工研究院资助项目

摘　　要：利用共沉淀法制备了纳米级的铬铈复合氧化物,研究了这些催化剂在CO2气氛下对乙苯的氧化脱氢.结果发现,复合氧化物的催化活性明显高于单纯的氧化物,这可能与复合氧化物中含有较多量的Cr6+以及Ce4+容易还原为Ce3+有关.与纯N2气氛相比,CO2对乙苯反应具有明显的促进作用.A series of nanosized Cr-Ce-O mixed oxides have been prepared by coprecipitation. The oxidative dehydrogenation of ethylbenzene over these catalysts in the presence of CO_(2) has been investigated. It is found that the mixed oxides show obviously higher activity than pure oxides. This is probably caused by the higher amount of Cr^(6+) present in the mixed oxides than in Cr_(2)O_(3) as well as the easier reduction of Ce^(4+) present in the mixed oxides than in CeO_(2), as shown in TPR results. Compared to the case in the absence of CO_(2 )(N_(2) atmosphere), carbon dioxide promotes the dehydrogenation of ethylbenzene.

关 键 词：CR2O3 CEO2 CO2 乙苯 氧化脱氢 纳米铬铈复合氧化物 氧化铬 二氧化碳 苯乙烯 

分 类 号：O625.12[理学—有机化学] O643.38[理学—化学]