In-situ 31P MAS NMR probing of the active centers in Ti silicalite molecular sieve

被引：3
作者：
Zhuang, Jianqin [1 ,2 ]
Han, Xiuwen [2 ]
Bao, Xinhe [2 ]
机构：
[1] CUNY Coll Staten Isl, Dept Chem, Staten Isl, NY 10314 USA
[2] Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
来源：
CATALYSIS COMMUNICATIONS | 2015年 / 62卷
基金：
中国国家自然科学基金;
关键词：
TS-1; zeolite; Trimethylphosphine; Active center; P-31 MAS NMR; TS-1; ZEOLITE; ACIDITY; CATALYSTS; TITANIUM;
D O I：
10.1016/j.catcom.2015.01.014
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：
The investigation of the active centers in titanium zeolite was conducted by a probe reaction, the oxidation of trimethylphosphine. The different sites of TS-1 zeolite can be clearly distinguished through P-31 solid-state MAS NMR spectra of adsorbed trimethylphosphine. The results showed that only the trimethylphosphine bound to the coordinate-unsaturated framework Ti sites and the distorted tetrahedral Ti sites ofTS-1 zeolite could be easily oxidized by urea hydrogen peroxide. Diffuse Reflectance UV-Vis and Si-29 MAS NMR spectra further confirmed that the titanium peroxide species (TiOOH), which is formed through the solid-solid interaction between urea-H2O2 and TS-1 zeolite, could be catalytic active centers during the oxidation of trimethylphosphine. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：75 / 78
页数：4
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