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Synthesis of Nanostructured Catalysts by Surfactant-Templating of Large-Pore Zeolites

Zholobenko, V; Mordvinova, N; Lebedev, OI; Vicente, A; Haslam, J; Al-Ani, A; fernandez, C

Synthesis of Nanostructured Catalysts by Surfactant-Templating of Large-Pore Zeolites Thumbnail


Authors

V Zholobenko

N Mordvinova

OI Lebedev

A Vicente

J Haslam

A Al-Ani

C fernandez



Abstract

Zeolites and related crystalline molecular sieves are utilised in a wide range of reactions and processes due to their regular microporous structure, strong acidity, shape selectivity and ion-exchange properties. However, their practical applications can be limited by the small size of the channels and cavities of the microporous structures, and therefore, a great deal of effort have been devoted to enhancing the transport of large-sized molecules in the host pores. Several commercially available zeolites, including faujasite (FAU), mordenite (MOR), beta (BEA), ZSM-5 (MFI) and zeolite L (LTL) have been exposed to a variety of acid and base treatments in the presence of a surfactant (cetyltrimethyl ammonium bromide, CTAB), which led to the controlled introduction of intracrystalline mesoporosity. A detailed characterisation of the obtained mesostructured zeolites has been carried out using FTIR spectroscopy, high resolution TEM, XRD, N2 adsorption, 29Si and 27Al MAS NMR. This work demonstrates a successful application of the supramolecular templating approach for generating tuneable mesoporosity in a range of zeolites possessing 12-membered ring channels, which has been applied to zeolite L for the first time, thus producing hierarchical meso-microporous materials with improved accessibility of active sites and enhanced catalytic performance in dealkylation of tri-isopropylbenzene.

Acceptance Date Feb 27, 2019
Publication Date May 1, 2019
Publicly Available Date Mar 28, 2024
Journal Nanoscale Advances
Print ISSN 2046-2069
Publisher Royal Society of Chemistry
Pages 2029-2039
DOI https://doi.org/10.1039/C9NA00004F
Keywords surfactant-templating, hierarchical zeolites, intracrystalline mesoporosity, 12-membered ring channels
Publisher URL http://dx.doi.org/10.1039/C9NA00004F

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