Post-synthesis, characterization and catalytic properties of fluorine-planted MWW-type titanosilicate

被引：58
|
作者：
Fang, Xiangqing [1 ]
Wang, Qiang [2 ]
Zheng, Anmin [2 ]
Liu, Yueming [1 ]
Lin, Longfei [1 ]
Wu, Haihong [1 ]
Deng, Feng [2 ]
He, Mingyuan [1 ]
Wu, Peng [1 ]
机构：
[1] E China Normal Univ, Dept Chem, Shanghai Key Lab Green Chem & Chem Proc, Shanghai 200062, Peoples R China
[2] Chinese Acad Sci, Wuhan Inst Phys & Math, State Key Lab Magnet Resonance & Atom & Mol Phys, Wuhan Ctr Magnet Resonance, Wuhan 430071, Peoples R China
来源：
PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2013年 / 15卷 / 14期
基金：
中国国家自然科学基金;
关键词：
HYDROGEN-PEROXIDE; HYDROTHERMAL SYNTHESIS; SELECTIVE PRODUCTION; ALKENE EPOXIDATION; HIGHLY EFFICIENT; ALLYL CHLORIDE; ACTIVE-SITES; TI-MWW; TITANIUM; OXIDATION;
D O I：
10.1039/c3cp44700f
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
F-Ti-MWW was post-synthesized by implanting fluorine species into a Ti-MWW framework through an acid treatment process in the presence of ammonium fluoride. The effects of NH4F addition amount, acid treatment temperature and precursor Ti content were investigated on the incorporation of F species, the zeolite structure and the coordination sites of Ti. Fluorine-implanting improved the surface hydrophobicity of the zeolite and altered the electropositivity nearby the tetrahedral Ti sites through forming the SiO3/2F and SiO4/2F- units. The negative effect of SiO4/2F- units in F-Ti-MWW was eliminated selectively by convenient anion-exchange with various alkali chlorides. F-Ti-MWW containing the SiO3/2F units possessed better catalytic activity and reusability, and a longer catalyst lifetime than conventional Ti-MWW.
引用
收藏
页码：4930 / 4938
页数：9
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