Publicação
Two new aluminophosphates, IST-1 and IST-2: first examples of a dual templating role of water and methylamine in generating microporous structures
| dc.contributor.author | Fernandes, A. | |
| dc.contributor.author | Ribeiro, M. F. | |
| dc.contributor.author | Borges, C. | |
| dc.contributor.author | Lourenço, J. P. | |
| dc.contributor.author | Rocha, J. | |
| dc.contributor.author | Gabelica, Z. | |
| dc.date.accessioned | 2013-01-07T14:37:01Z | |
| dc.date.available | 2013-01-07T14:37:01Z | |
| dc.date.issued | 2006 | |
| dc.date.updated | 2013-01-03T10:26:45Z | |
| dc.description.abstract | This study is aimed at exploring the ability of very small sized N-bearing molecules to generate and stabilize microporous aluminophosphates. Two new AlPO4-n materials, called IST-1 and IST-2, have been obtained in aqueous media using, as main template, methylamine (MA), directly added, or generated in situ from methylformamide (MF) degradation. While IST-1 topology proved to be novel, IST-2 appears structurally related to AlPO4-53(A). The obtained materials were characterized by powder XRD, TG/DSC, SEM and solid-state NMR. Tetraalkylammonium (TEA) cations were used as potential co-templates but only MA and water were found incorporated in the pore volumes of both structures, which argues for their true templating role. In IST-1, 13C solid-state NMR studies showed that half of MA species, presumably protonated, is H-bonded to framework oxygens while the other half surprisingly bonds directly to framework Al atoms. 13C NMR showed that only protonated MA occurs in IST-2 channels. TEA+ cations definitely do not play any specific template role. They indirectly favor the crystallization of IST-1 or IST-2 devoid from other crystalline or amorphous side phases, by interacting with part of the Al and P in solution and forming soluble [AlPO4(OH)]–[TEA,HMA] complexes, substantially modifying the compositions of gels precursors to each phase during nucleation and/or growth steps. While both IST-1 and IST-2 crystallize from gels of similar initial compositions, it was demonstrated that the new MA/T ratio (T = Al or P) obtained after in situ complexation was the key parameter that specifically governs the crystallization of each phase. | por |
| dc.identifier.citation | Fernandes, A.; Ribeiro, M. F.; Borges, C.; Lourenço, J. P.; Rocha, J.; Gabelica, Z. Two new aluminophosphates, IST-1 and IST-2: first examples of a dual templating role of water and methylamine in generating microporous structures, Microporous and Mesoporous Materials, 90, 112-128, 2006. | por |
| dc.identifier.issn | 1387-1811 | |
| dc.identifier.other | AUT: JLO01215; | |
| dc.identifier.uri | http://hdl.handle.net/10400.1/2063 | |
| dc.language.iso | eng | por |
| dc.peerreviewed | yes | por |
| dc.publisher | Elsevier | por |
| dc.subject | Aluminophosphate | por |
| dc.subject | IST-1 | por |
| dc.subject | IST-2 | por |
| dc.subject | TEAOH as additive | por |
| dc.subject | Methylamine-water as co-templates | por |
| dc.title | Two new aluminophosphates, IST-1 and IST-2: first examples of a dual templating role of water and methylamine in generating microporous structures | por |
| dc.type | journal article | |
| dspace.entity.type | Publication | |
| oaire.citation.endPage | 128 | por |
| oaire.citation.startPage | 112 | por |
| oaire.citation.title | Microporous and Mesoporous Materials | por |
| oaire.citation.volume | 90 | por |
| person.familyName | Lourenço | |
| person.givenName | João P. | |
| person.identifier | 634248 | |
| person.identifier.ciencia-id | F81F-A1F0-2A7C | |
| person.identifier.orcid | 0000-0002-0501-6672 | |
| person.identifier.rid | A-7758-2008 | |
| person.identifier.scopus-author-id | 57195730600 | |
| rcaap.rights | restrictedAccess | por |
| rcaap.type | article | por |
| relation.isAuthorOfPublication | f66ab886-d989-4c1d-9550-527507723c26 | |
| relation.isAuthorOfPublication.latestForDiscovery | f66ab886-d989-4c1d-9550-527507723c26 |