Ultrafast synthesis of nanosized Ti-Beta as an efficient oxidation catalyst via a structural reconstruction method

被引：30
作者：
Wang, Bowen [1 ]
Xu, Hao [1 ]
Zhu, Zhiguo [1 ]
Guan, Yejun [1 ]
Wu, Peng [1 ]
机构：
[1] East China Normal Univ, Shanghai Key Lab Green Chem & Chem Proc, Sch Chem & Mol Engn, North Zhongshan Rd 3663, Shanghai 200062, Peoples R China
来源：
CATALYSIS SCIENCE & TECHNOLOGY | 2019年 / 9卷 / 08期
关键词：
HYDROGEN-PEROXIDE; SELECTIVE OXIDATION; HYDROTHERMAL SYNTHESIS; MWW STRUCTURE; ZEOLITE-BETA; EPOXIDATION; TITANOSILICATE; TITANIUM; TS-1; OLEFINS;
D O I：
10.1039/c9cy00071b
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：
As a representative selective oxidation titanosilicate catalyst, a Ti-Beta zeolite is less used in comparison with TS-1, Ti-MWW and Ti-MOR, mostly due to its high hydrophilicity originating from a BEA* intergrowth framework. A novel recrystallization method was proposed in the present study to prepare highly hydrophobic Ti-Beta with nanosized crystals (90 nm), high Ti content (Si/Ti = 20) and intercrystal mesoporosity. The fluoride-assisted recrystallization was realized quickly by dissolving extensively a dealuminated Beta zeolite in a mixture of a tetraethylammonium aqueous solution and Ti precursor, producing highly crystalline Ti-Beta in an extremely short time of 1 h. The obtained Ti-Beta zeolite exhibited superior catalytic activity in the liquid-phase epoxidation reactions of bulky alkenes like cyclohexene with hydrogen peroxide or tert-butyl hydroperoxide as an oxidant, compared to those Ti-Beta catalysts prepared by conventional hydrothermal or secondary synthesis routes.
引用
收藏
页码：1857 / 1866
页数：10
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