FeZSM－5沸石上乙苯的吸附态及氧化脱氢  

ADSORPTION STATE AND CATALYSIS MECHANISM FOR OXYDEHYDROGENATION OF ETHYLBENZENE ON FeZSM 5 ZEOLITE

作　　者：张春雷[1] 吴志芸[1] 阚秋斌[1] 

机构地区：[1]吉林大学化学系

出　　处：《催化学报》1996年第1期34-39,共6页

基　　金：国家自然科学基金

摘　　要：ＦｅＺＳＭ－５吸附乙苯前后的ＩＲ、ＸＰＳ、ＥＳＲ及Ｍｏｓｓｂａｕｅｒ谱表明，乙苯分子的侧链和苯环与ＦｅＺＳＭ－５的活性位（以Ｆｅ为中心的结构单元）同时发生配位络合作用，减弱了乙苯分子侧链的α和β位Ｃ－Ｈ键，使其活化，在氧存在下易发生氧化脱氢反应生成苯乙烯．Ｆｅ（Ⅲ）是乙苯氧化脱氢的活性中心，尤其是骨架不饱和配位的Ｆｅ（Ⅲ）对活化乙苯分子起到了关键作用，碱金属平衡阳离子起到了助催化剂的作用．The IR, XPS, ESR and Mssbauer spectra of FeZSM 5 before and after ethylbenzene adsorption were studied. The results showed that coordination catalysis took place between the side chain and benzene ring of ethylbenzene and the active sites on FeZSM 5. The α and β sites C-H bond of ethylbenzene was weakened and activated. The ethylbenzene will be oxydehydrogenated in the presence of O 2. The iron(Ⅲ) is the active center for ethylbenzene oxydehydrogenation, especially, the framework iron(Ⅲ) with coordination unsaturation takes crucial action for ethylbenzene activation. The alkali cation has promoting effect on catalysis. The framework Fe(Ⅲ) has higher activity for ethylbenzene oxydehydrogenation than the nonframework Fe(Ⅲ).

关 键 词：乙苯 氧化脱氢 吸附态 分子筛 催化剂 

分 类 号：TQ424.25[化学工程] O625.11[理学—有机化学]