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Solid-state NMR and powder XRD studies of the structure of SAPO-40 upon hydration-dehydration cycles

1995Journal article Restricted access
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dc.contributor.authorLourenço, J. P.
dc.contributor.authorRibeiro, M. F.
dc.contributor.authorRibeiro, F. R.
dc.contributor.authorRocha, J.
dc.contributor.authorGabelica, Z.
dc.date.accessioned2012-06-15T14:12:52Z
dc.date.available2012-06-15T14:12:52Z
dc.date.issued1995
dc.date.updated2012-06-15T10:39:07Z
dc.description.abstractIt is well known that after the removal of the template many porous aluminophosphates and related materials are very sensitive to water.' Depending on the type of structure, reversible or irreversible phase transitions, loss of crystallinity and changes in the coordination of some framework A1 upon rehydration are observed. For example, solid-state NMR shows that the rehydration of SAPO-5 leads to the formation of octahedral Al. Subsequent dehydration restores the initial tetrahedral coordination of Al. Template-free SAPO-37 becomes totally amorphous to X-rays after exposure to water and stays so after subsequent thermal treatment^.,,^ In contrast, Barthomeuf and co-workers have shown recently, that, on hydration, template-free SAPO-34, an analogue of chabasite, shows the opening of some Si-0-A1 bonds, the effect being reversible upon dehydrati~n.T~h e hydrated distorted structure was found to be stable for months with no further modifications and the ordered material could be regenerated by removal of water. Here we wish to report that the structure of template-free SAPO-40 undergoes a similar reversible modification.pt_PT
dc.identifier.citationLourenço, J. P.; Ribeiro, M. F.; Ribeiro, F. R.; Rocha, J.; Gabelica, Z. Solid-state NMR and powder XRD studies of the structure of SAPO-40 upon hydration-dehydration cycles. J. Chem. Soc. Faraday Trans. 91, 2213-2215, 1995.por
dc.identifier.otherAUT: JLO01215;
dc.identifier.urihttp://hdl.handle.net/10400.1/1251
dc.language.isoengpor
dc.peerreviewedyespor
dc.subjectHydrothermal stabilitypor
dc.subjectSAPO-40por
dc.subjectNMRpor
dc.titleSolid-state NMR and powder XRD studies of the structure of SAPO-40 upon hydration-dehydration cyclespor
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage2215por
oaire.citation.issue91(14)por
oaire.citation.startPage2213por
oaire.citation.titleJ. Chem. Soc. Faraday Trans.por
person.familyNameLourenço
person.givenNameJoão P.
person.identifier634248
person.identifier.ciencia-idF81F-A1F0-2A7C
person.identifier.orcid0000-0002-0501-6672
person.identifier.ridA-7758-2008
person.identifier.scopus-author-id57195730600
rcaap.rightsopenAccesspor
rcaap.typearticlepor
relation.isAuthorOfPublicationf66ab886-d989-4c1d-9550-527507723c26
relation.isAuthorOfPublication.latestForDiscoveryf66ab886-d989-4c1d-9550-527507723c26

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