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首页> 外文期刊>Catalysis science & technology >Towards the preparation of binderless ZSM-5 zeolite catalysts: the crucial role of silanol nests
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Towards the preparation of binderless ZSM-5 zeolite catalysts: the crucial role of silanol nests

机译：对制备的无梁平板ZSM-5沸石催化剂:硅醇的至关重要的作用巢

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摘要

Zeolites, containing abundant silanol nests, are often called defective zeolites. Zeolite-based catalysts are shaped to be used effectively in industrial applications. Binders, which are catalytically inert, are indispensable components in the forming process. However, massive amounts of binders (usually 30-50 wt%) may cover the surface of the zeolites, thereby limiting the access to catalytic sites. In the present work, two types of binderless zeolites were prepared by the alkali post-treatment using a defective ZSM-5 zeolite as the starting material, namely monolithic binderless ZSM-5 zeolites dominated by micropores and hierarchical monolithic binderless ZSM-5 zeolites. It has been found that the silica binder can be converted into the zeolite phase in the binderless defective ZSM-5 zeolites. Moreover, an additional aluminum source can be incorporated into the zeolitic framework upon alkaline treatment. However, if the zeolite does not contain silanol nests, the Al incorporation is impossible. Combining with various characterization results, we proposed the formation mechanisms of binderless ZSM-5 zeolites, including re-crystallization and alumination. As expected, the as-treated binderless zeolites exhibit higher activity and selectivity than ordinary shaped zeolites with a binder in the catalytic cracking of n-hexane. This work provides new insight into the preparation and optimization of more monolithic zeolite catalysts from a practical point of view.
机译：沸石,含有丰富的硅醇的巢穴,通常被称为有缺陷的沸石。催化剂的有效使用工业应用。催化地惰性,是不可或缺的组件在形成过程中。的绑定(通常是30 - 50 wt %)可能覆盖沸石的表面,从而限制了获得催化网站。两种类型的无梁平板沸石是准备的使用有缺陷的ZSM-5碱后处理沸石为原料,即整体概述ZSM-5沸石为主微孔隙和分层整体概述ZSM-5沸石。粘结剂可转化为沸石阶段概述缺陷ZSM-5沸石。此外,额外的铝源纳入沸石的框架碱性治疗。不含硅醇的巢穴,合并是不可能的。表征的结果,我们提出了形成机制概述ZSM-5沸石,包括re-crystallization和alumination。概述沸石展览活动和高选择性比普通形状的沸石粘结剂的催化裂化正己烷。这项工作提供了新的见解的制备和优化更整体沸石催化剂从实用的观点。

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