Zeolite Synthesis Using Imidazolium Cations as Organic Structure-Directing Agents

Abstract

Imidazolium-derivative cations are very interesting molecules used as organic structure-directing agents (OSDAs) for zeolite synthesis, widening the possibilities of new materials and applications in this research area. In this review, the studies performed at LABPEMOL using this kind of compound are presented after a quick overview on imidazolium derivatives. The first zeolite synthesis results that started this research study were obtained with 1-butyl-3-methylimidazolium chloride. Then, the design of new OSDAs based on the imidazolium cation, such as 1,2,3-triethylimidazolium, 2-ethyl-1,3-dimethylimidazolium and 1,2,3-triethyl-4-methylimidazolium, is reported. Afterwards, the structure-direction effect caused by the introduction of heteroatoms with already-published imidazolium derivatives (for example, the Al3+ insertion into zeolite frameworks with two different OSDAs and the silicoaluminophosphate (SAPO) synthesis using 2-ethyl-1,3,4 trimethylimidazolium cations) is discussed. Finally, we also present a quick overview of some achievements of other laboratories.

A review on ionothermal synthesis of zeolites and zeotype materials

“…Besides the considerable interest in ionic liquids due to their diverse properties, such as high ionic conductivity, negligible volatility, non-flammability, and high thermal and chemical stability [31,32], over recent years, ILs have shown new potential as green solvents for chemical reactions [33][34][35] known as 'the ionothermal process'. This has attracted the great interest of many scientific researchers around the world who have contributed to this field [36][37][38][39][40][41][42][43][44][45], including Ahmed and Ruck [46], Wang et al [18], Tian and Liu. [47], Liu and Yu.…”

Impact of Cations and Framework on Trapdoor Behavior: A Study of Dynamic and In Situ Gas Analysis

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