Introduction of Al into the HPM-1 framework by in situ generated seeds as an alternative methodology

An alternative method for the introduction of aluminum into the STW zeolitic framework is presented. HPM-1, a chiral STW zeolite with helical pores, was synthesized in the pure silica form, and an aluminum source was added by in situ generated seeds. Displacements of the peak positions in the Al...

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Principais autores: Pergher, Sibele Berenice Castellã, Vinaches, Paloma, Rojas, Alex, Alencar, Ana Ellen V. de, Castellón, Enrique Rodríguez, Braga, Tiago P.
Formato: article
Idioma:English
Publicado em: MDPI
Assuntos:
STW zeolite
Aluminosilicate
Seeds
2-ethyl-1,3,4-trimethylimidazolium
Hydrofluoric media
Ethanol dehydration
Endereço do item:https://repositorio.ufrn.br/jspui/handle/123456789/29583
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spelling ri-123456789-295832021-02-15T22:00:03Z Introduction of Al into the HPM-1 framework by in situ generated seeds as an alternative methodology Pergher, Sibele Berenice Castellã Vinaches, Paloma Rojas, Alex Alencar, Ana Ellen V. de Castellón, Enrique Rodríguez Braga, Tiago P. STW zeolite Aluminosilicate Seeds 2-ethyl-1,3,4-trimethylimidazolium Hydrofluoric media Ethanol dehydration An alternative method for the introduction of aluminum into the STW zeolitic framework is presented. HPM-1, a chiral STW zeolite with helical pores, was synthesized in the pure silica form, and an aluminum source was added by in situ generated seeds. Displacements of the peak positions in the Al samples were found in the X-ray diffractograms, indicating the possible incorporation of the heteroatom into the framework. Using an analysis of the 29Si and 27Al magic-angle spinning nuclear magnetic resonance (MAS NMR) spectra, we concluded that the aluminum was effectively introduced into the framework. The (AlTETRAHEDRAL/AlOCTAHEDRAL) ratio and its textural properties were studied to explain the catalytic ethanol conversion results at medium temperatures. The sample with the lowest Si/Al ratio showed the best results due to its higher surface area and pore volume, in comparison to those observed for the sample with the highest Si/Al ratio, and due to its higher bulk tetrahedral aluminum content, in comparison to the intermediate Si/Al ratio sample. All catalysts were selective to ethylene and diethyl ether, confirming the presence of acidic sites 2020-07-13T17:38:54Z 2020-07-13T17:38:54Z 2018-09-13 article VINACHES, Paloma; ROJAS, Alex; ALENCAR, Ana de; CASTELLÓN, Enrique R.; BRAGA, Tiago; PERGHER, Sibele Berenice Castellã. Introduction of Al into the HPM-1 Framework by In Situ Generated Seeds as an Alternative Methodology. Applied Sciences, [s.l.], v. 8, n. 9, p. 1634 (11p.), 13 set. 2018. ISSN 2076-3417 versão online. Disponível em: https://www.mdpi.com/2076-3417/8/9/1634. Acesso em 13 jul. 2020. http://dx.doi.org/10.3390/app8091634 2076-3417 https://repositorio.ufrn.br/jspui/handle/123456789/29583 10.3390/app8091634 en Attribution 3.0 Brazil http://creativecommons.org/licenses/by/3.0/br/ application/pdf MDPI
institution Repositório Institucional
collection RI - UFRN
language English
topic STW zeolite
Aluminosilicate
Seeds
2-ethyl-1,3,4-trimethylimidazolium
Hydrofluoric media
Ethanol dehydration
spellingShingle STW zeolite
Aluminosilicate
Seeds
2-ethyl-1,3,4-trimethylimidazolium
Hydrofluoric media
Ethanol dehydration
Pergher, Sibele Berenice Castellã
Vinaches, Paloma
Rojas, Alex
Alencar, Ana Ellen V. de
Castellón, Enrique Rodríguez
Braga, Tiago P.
Introduction of Al into the HPM-1 framework by in situ generated seeds as an alternative methodology
description An alternative method for the introduction of aluminum into the STW zeolitic framework is presented. HPM-1, a chiral STW zeolite with helical pores, was synthesized in the pure silica form, and an aluminum source was added by in situ generated seeds. Displacements of the peak positions in the Al samples were found in the X-ray diffractograms, indicating the possible incorporation of the heteroatom into the framework. Using an analysis of the 29Si and 27Al magic-angle spinning nuclear magnetic resonance (MAS NMR) spectra, we concluded that the aluminum was effectively introduced into the framework. The (AlTETRAHEDRAL/AlOCTAHEDRAL) ratio and its textural properties were studied to explain the catalytic ethanol conversion results at medium temperatures. The sample with the lowest Si/Al ratio showed the best results due to its higher surface area and pore volume, in comparison to those observed for the sample with the highest Si/Al ratio, and due to its higher bulk tetrahedral aluminum content, in comparison to the intermediate Si/Al ratio sample. All catalysts were selective to ethylene and diethyl ether, confirming the presence of acidic sites
format article
author Pergher, Sibele Berenice Castellã
Vinaches, Paloma
Rojas, Alex
Alencar, Ana Ellen V. de
Castellón, Enrique Rodríguez
Braga, Tiago P.
author_facet Pergher, Sibele Berenice Castellã
Vinaches, Paloma
Rojas, Alex
Alencar, Ana Ellen V. de
Castellón, Enrique Rodríguez
Braga, Tiago P.
author_sort Pergher, Sibele Berenice Castellã
title Introduction of Al into the HPM-1 framework by in situ generated seeds as an alternative methodology
title_short Introduction of Al into the HPM-1 framework by in situ generated seeds as an alternative methodology
title_full Introduction of Al into the HPM-1 framework by in situ generated seeds as an alternative methodology
title_fullStr Introduction of Al into the HPM-1 framework by in situ generated seeds as an alternative methodology
title_full_unstemmed Introduction of Al into the HPM-1 framework by in situ generated seeds as an alternative methodology
title_sort introduction of al into the hpm-1 framework by in situ generated seeds as an alternative methodology
publisher MDPI
publishDate 2020
url https://repositorio.ufrn.br/jspui/handle/123456789/29583
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AT rojasalex introductionofalintothehpm1frameworkbyinsitugeneratedseedsasanalternativemethodology
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