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A Systematic Study of Isomorphically Substituted H‐MAlPO‐5 Materials for the Methanol‐to‐Hydrocarbons Reaction

Substituting metals for either aluminum or phosphorus in crystalline, microporous aluminophosphates creates Brønsted acid sites, which are well known to catalyze several key reactions, including the methanol to hydrocarbons (MTH) reaction. In this work, we synthesized a series of metal‐substituted a...

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Autores principales: Mortén, Magnus, Mentel, Łukasz, Lazzarini, Andrea, Pankin, Ilia A., Lamberti, Carlo, Bordiga, Silvia, Crocellà, Valentina, Svelle, Stian, Lillerud, Karl Petter, Olsbye, Unni
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5838544/
https://www.ncbi.nlm.nih.gov/pubmed/29250897
http://dx.doi.org/10.1002/cphc.201701024
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author Mortén, Magnus
Mentel, Łukasz
Lazzarini, Andrea
Pankin, Ilia A.
Lamberti, Carlo
Bordiga, Silvia
Crocellà, Valentina
Svelle, Stian
Lillerud, Karl Petter
Olsbye, Unni
author_facet Mortén, Magnus
Mentel, Łukasz
Lazzarini, Andrea
Pankin, Ilia A.
Lamberti, Carlo
Bordiga, Silvia
Crocellà, Valentina
Svelle, Stian
Lillerud, Karl Petter
Olsbye, Unni
author_sort Mortén, Magnus
collection PubMed
description Substituting metals for either aluminum or phosphorus in crystalline, microporous aluminophosphates creates Brønsted acid sites, which are well known to catalyze several key reactions, including the methanol to hydrocarbons (MTH) reaction. In this work, we synthesized a series of metal‐substituted aluminophosphates with AFI topology that differed primarily in their acid strength and that spanned a predicted range from high Brønsted acidity (H‐MgAlPO‐5, H‐CoAlPO‐5, and H‐ZnAlPO‐5) to medium acidity (H‐SAPO‐5) and low acidity (H‐TiAlPO‐5 and H‐ZrAlPO‐5). The synthesis was aimed to produce materials with homogenous properties (e.g. morphology, crystallite size, acid‐site density, and surface area) to isolate the influence of metal substitution. This was verified by extensive characterization. The materials were tested in the MTH reaction at 450 °C by using dimethyl ether (DME) as feed. A clear activity difference was found, for which the predicted stronger acids converted DME significantly faster than the medium and weak Brønsted acidic materials. Furthermore, the stronger Brønsted acids (Mg, Co and Zn) produced more light alkenes than the weaker acids. The weaker acids, especially H‐SAPO‐5, produced more aromatics and alkanes, which indicates that the relative rates of competing reactions change upon decreasing the acid strength.
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spelling pubmed-58385442018-03-12 A Systematic Study of Isomorphically Substituted H‐MAlPO‐5 Materials for the Methanol‐to‐Hydrocarbons Reaction Mortén, Magnus Mentel, Łukasz Lazzarini, Andrea Pankin, Ilia A. Lamberti, Carlo Bordiga, Silvia Crocellà, Valentina Svelle, Stian Lillerud, Karl Petter Olsbye, Unni Chemphyschem Articles Substituting metals for either aluminum or phosphorus in crystalline, microporous aluminophosphates creates Brønsted acid sites, which are well known to catalyze several key reactions, including the methanol to hydrocarbons (MTH) reaction. In this work, we synthesized a series of metal‐substituted aluminophosphates with AFI topology that differed primarily in their acid strength and that spanned a predicted range from high Brønsted acidity (H‐MgAlPO‐5, H‐CoAlPO‐5, and H‐ZnAlPO‐5) to medium acidity (H‐SAPO‐5) and low acidity (H‐TiAlPO‐5 and H‐ZrAlPO‐5). The synthesis was aimed to produce materials with homogenous properties (e.g. morphology, crystallite size, acid‐site density, and surface area) to isolate the influence of metal substitution. This was verified by extensive characterization. The materials were tested in the MTH reaction at 450 °C by using dimethyl ether (DME) as feed. A clear activity difference was found, for which the predicted stronger acids converted DME significantly faster than the medium and weak Brønsted acidic materials. Furthermore, the stronger Brønsted acids (Mg, Co and Zn) produced more light alkenes than the weaker acids. The weaker acids, especially H‐SAPO‐5, produced more aromatics and alkanes, which indicates that the relative rates of competing reactions change upon decreasing the acid strength. John Wiley and Sons Inc. 2017-12-18 2018-02-19 /pmc/articles/PMC5838544/ /pubmed/29250897 http://dx.doi.org/10.1002/cphc.201701024 Text en © 2018 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA. This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial‐NoDerivs (http://creativecommons.org/licenses/by-nc-nd/4.0/) License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.
spellingShingle Articles
Mortén, Magnus
Mentel, Łukasz
Lazzarini, Andrea
Pankin, Ilia A.
Lamberti, Carlo
Bordiga, Silvia
Crocellà, Valentina
Svelle, Stian
Lillerud, Karl Petter
Olsbye, Unni
A Systematic Study of Isomorphically Substituted H‐MAlPO‐5 Materials for the Methanol‐to‐Hydrocarbons Reaction
title A Systematic Study of Isomorphically Substituted H‐MAlPO‐5 Materials for the Methanol‐to‐Hydrocarbons Reaction
title_full A Systematic Study of Isomorphically Substituted H‐MAlPO‐5 Materials for the Methanol‐to‐Hydrocarbons Reaction
title_fullStr A Systematic Study of Isomorphically Substituted H‐MAlPO‐5 Materials for the Methanol‐to‐Hydrocarbons Reaction
title_full_unstemmed A Systematic Study of Isomorphically Substituted H‐MAlPO‐5 Materials for the Methanol‐to‐Hydrocarbons Reaction
title_short A Systematic Study of Isomorphically Substituted H‐MAlPO‐5 Materials for the Methanol‐to‐Hydrocarbons Reaction
title_sort systematic study of isomorphically substituted h‐malpo‐5 materials for the methanol‐to‐hydrocarbons reaction
topic Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5838544/
https://www.ncbi.nlm.nih.gov/pubmed/29250897
http://dx.doi.org/10.1002/cphc.201701024
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