Ce-Beta分子筛的制备及其催化性能(英文)  被引量:3

Incorporation of cerium atoms into Al-free Beta zeolite framework for catalytic application

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作  者:唐波[1] 戴卫理[1] 孙晓明[1,2] 武光军[1] 李兰冬[1] 关乃佳[1] Michael Hunger 

机构地区:[1]南开大学化学学院、先进能源材料化学教育部重点实验室、天津化学化工协同创新中心,天津300071 [2]斯图加特大学、化学工程研究所,德国斯图加特70550

出  处:《催化学报》2015年第6期801-805,共5页

基  金:supported by the National Natural Science Foundation of China(21373119);the Ministry of Education of China(IRT13022,IRT13R30);111 Project(B12015);Deutsche Forschungsgemeinschaft~~

摘  要:采用简单、易重现的两步后合成法成功制备了Ce-Beta分子筛.制备过程中,H-Beta分子筛首先经过脱铝处理得到Si-Beta分子筛,然后再以异丙醇铈为前驱体,通过干法浸渍的途径向Si-Beta分子筛引入Ce(IV).利用XRD,FT-IR,UV-Vis和1H MAS NMR等对其结构进行了表征,结果表明,Ce(IV)物种以四配位的形式成功引入Beta分子筛的骨架,Ce原子进入分子筛骨架的机理通过DRIFT光谱得以证实.通过环氧化合物水合制备1,2-二醇反应对所制的Ce-Beta催化剂进行了催化性能评价.Ce(IV)-containing zeolite Beta was successfully prepared by a reproducible and scalable two-step post-synthesis strategy. This consists of creating vacant T sites that are associated with silanol groups by the dealumination of the H-Beta zeolite and a subsequent dry impregnation of the re-sultant Si-Beta zeolite with cerium (IV) isopropoxide. XRD, FT-IR, UV-Vis and 1H MAS NMR con-firmed that Ce(IV) was successfully incorporated into the Beta zeolite framework by the post-synthesis procedures and that they exist as isolated atoms with tetrahedral coordination. The mechanism of Ce incorporation into the framework of Beta zeolite was confirmed by DRIFT spec-troscopy. The ring-opening hydration of epoxides to their corresponding 1,2-diols was selected as a model reaction for an evaluation of the catalytic performance of the as-synthesized Ce-Beta zeolite.

关 键 词:Ce-Beta分子筛 后合成 脱铝 开环水合 环氧 

分 类 号:O643.36[理学—物理化学]

 

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