Please use this identifier to cite or link to this item:
http://hdl.handle.net/10773/19608
Full metadata record
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Wiper, Paul V. | pt |
dc.contributor.author | Amelse, Jeffrey | pt |
dc.contributor.author | Mafra, Luis | pt |
dc.date.accessioned | 2017-12-07T19:18:34Z | - |
dc.date.issued | 2014 | pt |
dc.identifier.issn | 0021-9517 | pt |
dc.identifier.uri | http://hdl.handle.net/10773/19608 | - |
dc.description.abstract | The acid properties of a dehydrated borosilicate, HAMS-1B (H-[B]-ZSM-5), including the acid types, strengths, location, and quantities are investigated by means of trialkylphosphine oxides through multinuclear ID/2D MAS NMR experiments. B-11 DQF-STMAS combined with H-1 MAS NMR studies revealed B-OH and distinct Si-OH protons associated with trigonal boron. P-31 NMR spectra of TMPO-treated HAMS-1B reveal three Bronsted and three Lewis acid sites. We have found a number of limitations applying the TMPO/TBPO method to identify internal/external acidity. Therefore, we propose a new approach to unambiguously discriminate external/internal acid sites by treating a pore-free and pore-blocked HAMS-1B zeolite. This method provided unique structural insight regarding the identification of boron species/coordinations associated with Bronsted/Lewis acid sites. Additionally, ICP analysis in tandem with solid-state NMR enabled full assignment of the detected internal/external acid species and the study of their acid strength. Moreover, we identify the nature of TMPO complexes arising from Bronsted/Lewis interactions. (C) 2014 Elsevier Inc. All rights reserved. | pt |
dc.language.iso | eng | pt |
dc.publisher | ACADEMIC PRESS INC ELSEVIER SCIENCE | pt |
dc.relation | info:eu-repo/grantAgreement/FCT/COMPETE/132936/PT | pt |
dc.rights | restrictedAccess | por |
dc.subject | BORON-SUBSTITUTED ZSM-5 | pt |
dc.subject | ISOMORPHOUS SUBSTITUTION | pt |
dc.subject | P-31 NMR | pt |
dc.subject | TRIMETHYLPHOSPHINE OXIDE | pt |
dc.subject | THEORETICAL CALCULATION | pt |
dc.subject | DEHYDRATED ZEOLITE | pt |
dc.subject | CHEMICAL-SHIFT | pt |
dc.subject | SITES | pt |
dc.subject | SPECTROSCOPY | pt |
dc.subject | BORALITES | pt |
dc.title | Multinuclear solid-state NMR characterization of the Bronsted/Lewis acid properties in the BP HAMS-1B (H-[B]-ZSM-5) borosilicate molecular sieve using adsorbed TMPO and TBPO probe molecules | pt |
dc.type | article | pt |
dc.peerreviewed | yes | pt |
ua.distribution | international | pt |
degois.publication.firstPage | 240 | pt |
degois.publication.lastPage | 250 | pt |
degois.publication.title | JOURNAL OF CATALYSIS | pt |
degois.publication.volume | 316 | pt |
dc.date.embargo | 10000-01-01 | - |
dc.relation.publisherversion | 10.1016/j.jcat.2014.05.017 | pt |
dc.identifier.doi | 10.1016/j.jcat.2014.05.017 | pt |
Appears in Collections: | CICECO - Artigos |
Files in This Item:
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.