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首页> 外文期刊>Catalysis science & technology >Ultrafast synthesis of nanosized Ti-Beta as an efficient oxidation catalyst via a structural reconstruction method
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Ultrafast synthesis of nanosized Ti-Beta as an efficient oxidation catalyst via a structural reconstruction method

机译：超快的合成纳米Ti-Beta作为通过结构高效氧化催化剂重建方法

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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.
机译：代表选择性氧化titanosilicate催化剂,Ti-Beta沸石更少的使用与TS-1相比,Ti-MWW和Ti-MOR,主要是由于其较高的亲水性来自BEA *共生框架。提出了新的再结晶方法本研究准备高度疏水Ti-Beta纳米晶体(90海里),高内容(Si / Ti = 20),晶间中孔隙。再结晶很快就实现了广泛溶解脱铝β沸石在一个四乙铵的混合物水溶液和钛前体,生产高度结晶Ti-Beta极短时间1 h。获得Ti-Beta沸石表现出优异的催化活性笨重的液相环氧化反应烯烃与环己烯与过氧化氢或叔丁基氢过氧化物作为氧化剂,相比Ti-Beta催化剂由传统的热液或二次合成路线。

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