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A procedure for identifying possible products in the Assembly-Disassembly-Organisation-Reassembly (ADOR) synthesis of zeolites

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Author(s)

Susan E. Henkelis, Michal Mazur, Cameron M. Rice, Giulia P. M. Bignami, Paul S. Wheatley, Sharon E. Ashbrook, Jiří Čejka, Russell E. Morris

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Abstract

High-silica zeolites, some of the most important and widely used catalysts in industry, have potential for application across a wide range of traditional and emerging technologies. The many structural topologies of zeolites have a variety of potential uses, so a strong drive to create new zeolites exists. Here, we present a protocol, the assembly–disassembly–organization–reassembly (ADOR) process, for a relatively new method of preparing these important solids. It allows the synthesis of new high-silica zeolites (Si/Al >1,000), whose synthesis is considered infeasible with traditional (solvothermal) methods, offering new topologies that may find novel applications. We show how to identify the optimal conditions (e.g., duration of reaction, temperature, acidity) for ADOR, which is a complex process with different possible outcomes. Following the protocol will allow researchers to identify the different products that are possible from a reaction without recourse to repetitive and time-consuming trial and error. In developing the protocol, germanium-containing UTL zeolites were subjected to hydrolysis conditions using both water and hydrochloric acid as media, which provides an understanding of the effects of temperature and pH on the disassembly (D) and organization (O) steps of the process that define the potential products. Samples were taken from the ongoing reaction periodically over a minimum of 8 h, and each sample was analyzed using powder X-ray diffraction to yield a time course for the reaction at each set of conditions; selected samples were analyzed using transmission electron microscopy and solid-state NMR spectroscopy.
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Details

Original languageEnglish
Number of pages14
JournalNature Protocols
Early online date25 Jan 2019
DOIs
Publication statusE-pub ahead of print - 25 Jan 2019

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