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Sinter-resistant gold nanoparticles encapsulated by zeolite nanoshell for oxidation of cyclohexane

机译：烧结金纳米颗粒被沸石纳米孔包封以氧化环己烷

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摘要

A large surface-to-volume ratio is a prerequisite for highly effective heterogeneous catalysts. Making catalysts in the form of nanoparticles provides a good way to realize this aim. However, agglomeration of such nanoparticles during the preparation and catalytic reaction remains a formidable problem. In the present work we have synthesized gold nanoparticles-coated with different zeolites, ZSM-5 and MCM-22, by hydrothermal route. The method adopted is generic where gold nanoparticles were firstly encapsulated by silica utilizing Stober's process and further these silica coated gold nanoparticles are transformed into Au@MCM-22 and Au@ZSM-5 by modified hydrothermal route. The sinter resistant gold nanoparticle core encapsulated by zeolitic nanoshell showed enhanced conversion for the test reaction of oxidation of cyclohexane to KA-oil, which is an important intermediate in the production of nylon-6 and nylon-6,6. The nano-capsules act as bifunctional catalyst, with the nanoparticles prevented from agglomeration during synthesis or catalytic applications, and the zeolitic-shell enhanced conversion and reusability of the nano-catalyst.
机译：大的表面到体积比是高效的异质催化剂的先决条件。制备纳米颗粒形式的催化剂提供了实现这一目标的好方法。然而，在制备和催化反应期间这种纳米颗粒的凝聚仍然是一个突起的问题。在本工作中，我们通过水热途径合成了用不同的沸石，ZSM-5和MCM-22涂覆的金纳米颗粒。采用的方法是通用的，其中通过二氧化硅首先通过利用STOMICA的方法包封金纳米粒子，并通过改性的水热途径将这些二氧化硅涂覆的金纳米颗粒转化为Au @ MCM-22和Au @ ZSM-5。抗沸石纳米壳包封的烧结金纳米粒子核的含量增强了转化转化，用于氧化环己烷至Ka-油的试验反应，这是尼龙-6和尼龙-6,6的产生中的重要中间体。纳米胶囊作为双官能催化剂，其中纳米颗粒在合成或催化应用期间防止聚集，沸石壳增强了纳米催化剂的转化性和可重用性。

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