1H–31P HETCOR NMR elucidates the nature of acid sites in zeolite HZSM-5 probed with trimethylphosphine oxide

Carlos Bornes; Mariana Sardo; Zhi Lin; Jeffrey Amelse; Auguste Fernandes; Maria Filipa Ribeiro; Carlos Geraldes; João Rocha; Luís Mafra

doi:10.1039/C9CC06763A

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¹H–³¹P HETCOR NMR elucidates the nature of acid sites in zeolite HZSM-5 probed with trimethylphosphine oxide†

Carlos Bornes,

^a Mariana Sardo,

^a Zhi Lin,

^a Jeffrey Amelse,

^a Auguste Fernandes,

^b Maria Filipa Ribeiro,

^b Carlos Geraldes,

^cd João Rocha

^a and Luís Mafra

*^a

Author affiliations

* Corresponding authors

^a CICECO – Aveiro Institute of Materials, Department of Chemistry, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
E-mail: lmafra@ua.pt

^b Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal

^c Department of Life Sciences and Coimbra Chemistry Center, Faculty of Science and Technology, University of Coimbra, 3000-393 Coimbra, Portugal

^d CIBIT-Coimbra Institute for Biomedical Imaging and Translational Research, Edifício do ICNAS, 3000-548 Coimbra, Portugal

Abstract

Two-dimensional ¹H–³¹P heteronuclear correlation NMR of trimethylphosphine oxide (TMPO) adsorbed in zeolites, in tandem with DFT calculations, challenges previous one-dimensional ³¹P NMR assignments, enabling the unambiguous discrimination of Brønsted and Lewis acid sites, extending the understanding of TMPO:Brønsted complexes formed with distinct stoichiometries at the HZSM-5 zeolite surface, and the proton-transfer mechanism.

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Article information

DOI: https://doi.org/10.1039/C9CC06763A
Article type: Communication
Submitted: 30 Aug 2019
Accepted: 26 Sep 2019
First published: 26 Sep 2019

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Chem. Commun., 2019,55, 12635-12638

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¹H–³¹P HETCOR NMR elucidates the nature of acid sites in zeolite HZSM-5 probed with trimethylphosphine oxide

C. Bornes, M. Sardo, Z. Lin, J. Amelse, A. Fernandes, M. F. Ribeiro, C. Geraldes, J. Rocha and L. Mafra, Chem. Commun., 2019, 55, 12635 DOI: 10.1039/C9CC06763A

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