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

页码：1857 / 1866

页数：10

共 39 条

[1]

Balkus KJ, 1996, STUD SURF SCI CATAL, V101, P1341

[2] Unseeded synthesis of Al-free Ti-beta zeolite in fluoride medium: A hydrophobic selective oxidation catalyst [J].