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Synthesis of nanostructured catalysts by surfactant-templating of large-pore zeolites

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...

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Autores principales: Al-Ani, Aqeel, Haslam, Josiah J. C., Mordvinova, Natalie E., Lebedev, Oleg I., Vicente, Aurélie, Fernandez, Christian, Zholobenko, Vladimir
Formato: Online Artículo Texto
Lenguaje:English
Publicado: RSC 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9416908/
https://www.ncbi.nlm.nih.gov/pubmed/36134217
http://dx.doi.org/10.1039/c9na00004f
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author Al-Ani, Aqeel
Haslam, Josiah J. C.
Mordvinova, Natalie E.
Lebedev, Oleg I.
Vicente, Aurélie
Fernandez, Christian
Zholobenko, Vladimir
author_facet Al-Ani, Aqeel
Haslam, Josiah J. C.
Mordvinova, Natalie E.
Lebedev, Oleg I.
Vicente, Aurélie
Fernandez, Christian
Zholobenko, Vladimir
author_sort Al-Ani, Aqeel
collection PubMed
description 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 has 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. The detailed characterisation of the obtained mesostructured zeolites has been carried out using FTIR spectroscopy, high resolution TEM, XRD, N(2) adsorption, (29)Si and (27)Al 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.
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spelling pubmed-94169082022-09-20 Synthesis of nanostructured catalysts by surfactant-templating of large-pore zeolites Al-Ani, Aqeel Haslam, Josiah J. C. Mordvinova, Natalie E. Lebedev, Oleg I. Vicente, Aurélie Fernandez, Christian Zholobenko, Vladimir Nanoscale Adv Chemistry 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 has 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. The detailed characterisation of the obtained mesostructured zeolites has been carried out using FTIR spectroscopy, high resolution TEM, XRD, N(2) adsorption, (29)Si and (27)Al 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. RSC 2019-02-28 /pmc/articles/PMC9416908/ /pubmed/36134217 http://dx.doi.org/10.1039/c9na00004f Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/
spellingShingle Chemistry
Al-Ani, Aqeel
Haslam, Josiah J. C.
Mordvinova, Natalie E.
Lebedev, Oleg I.
Vicente, Aurélie
Fernandez, Christian
Zholobenko, Vladimir
Synthesis of nanostructured catalysts by surfactant-templating of large-pore zeolites
title Synthesis of nanostructured catalysts by surfactant-templating of large-pore zeolites
title_full Synthesis of nanostructured catalysts by surfactant-templating of large-pore zeolites
title_fullStr Synthesis of nanostructured catalysts by surfactant-templating of large-pore zeolites
title_full_unstemmed Synthesis of nanostructured catalysts by surfactant-templating of large-pore zeolites
title_short Synthesis of nanostructured catalysts by surfactant-templating of large-pore zeolites
title_sort synthesis of nanostructured catalysts by surfactant-templating of large-pore zeolites
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9416908/
https://www.ncbi.nlm.nih.gov/pubmed/36134217
http://dx.doi.org/10.1039/c9na00004f
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