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首页> 外文期刊>RSC Advances >Controlling the microstructure of MFI zeolites with Mg(OH)(2) nanocrystals to improve their catalytic performances
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Controlling the microstructure of MFI zeolites with Mg(OH)(2) nanocrystals to improve their catalytic performances

机译：用Mg（OH）（2）纳米晶体控制MFI沸石的微观结构以提高其催化性能

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摘要

Control of the microstructure and morphology of molecular sieve crystals will significantly affect their catalytic performances. In this paper, titanium silicalite-1 (TS-1) and silicalite-1 (S-1) crystals were synthesized under hydrothermal conditions in the presence of Mg(OH)(2) nanocrystals (NCs). XRD, TEM, FT-IR, and N-2 adsorption were used to characterize the structure of TS-1 and S-1 crystals. The introduction of Mg(OH)(2) NCs endow the as-synthesized TS-1 and S-1 with a much more rugged surface and some voids and slits via attachment onto the surface or entrapment inside TS-1 and S-1 crystals. The crystallinity behavior, microstructure and morphology of TS-1 and S-1 also are effectively affected and modified by the presence of Mg(OH)(2) NCs. The obtained TS-1 and S-1 crystals were examined as catalysts for the cyclohexanone ammoximation and vapor phase Beckmann rearrangement of cyclohexanone oxime, respectively. The highest catalytic performances of the two reactions had been obtained when the Mg(OH)(2) additive amount was 10 wt%. The catalytic performance was improved when the appropriate amount of Mg(OH)(2) NCs was introduced into the MFI zeolite synthesis solution.
机译：控制分子筛晶体的微观结构和形态将显着影响其催化性能。在本文中，在存在Mg（OH）（2）纳米晶体（NCs）的情况下，在水热条件下合成了钛硅质岩-1（TS-1）和硅质岩-1（S-1）晶体。 XRD，TEM，FT-IR和N-2吸附用于表征TS-1和S-1晶体的结构。 Mg（OH）（2）NC的引入使合成后的TS-1和S-1表面更加坚固，并且通过附着在TS-1和S-1晶体的表面或内部而形成了一些空隙和缝隙。 Mg（OH）（2）NCs的存在也有效地影响和修饰了TS-1和S-1的结晶行为，微观结构和形态。将获得的TS-1和S-1晶体分别用作环己酮肟化和环己酮肟气相贝克曼重排的催化剂。当Mg（OH）（2）的添加量为10 wt％时，获得了两个反应的最高催化性能。将适当量的Mg（OH）（2）NCs引入MFI沸石合成溶液中，可提高催化性能。

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