Synthesis and Characterization of Chromium Silicalite

Detalhes bibliográficos
Autor(a) principal: Mambrim, José Silvio T.
Data de Publicação: 1993
Outros Autores: Pastore, Heloise de Oliveira, Davanzo, Celso U., Vichi, Eduardo Joaquim de Souza, Nakamura, Ossamu, Vargas, Helion
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFBA
Texto Completo: http://www.repositorio.ufba.br/ri/handle/ri/12996
Resumo: Texto completo. Acesso restrito. p. 166-173
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spelling Mambrim, José Silvio T.Pastore, Heloise de OliveiraDavanzo, Celso U.Vichi, Eduardo Joaquim de SouzaNakamura, OssamuVargas, HelionMambrim, José Silvio T.Pastore, Heloise de OliveiraDavanzo, Celso U.Vichi, Eduardo Joaquim de SouzaNakamura, OssamuVargas, Helion2013-09-18T17:15:44Z2013-09-18T17:15:44Z19930897-4756http://www.repositorio.ufba.br/ri/handle/ri/12996Texto completo. Acesso restrito. p. 166-173Infrared spectroscopy (mid-IR), 29Sia nd 27Alm agic angle spinning nuclear magnetic resonance (MAS-NMR), powder X-ray diffraction (PXRD), electron paramagnetic resonance (EPR), and photoacoustic spectroscopy (PAS), in combination, have produced useful information about a series of crystalline MFI-type chromium silicalite, synthesized in a fluoride medium. Aluminum is an impurity and occupies framework sites, as evaluated by the 27Al MAS-NMR. The mid-IR spectra are very similar to the zeolite ZSM-5 with the addition of a weak band at ~68c0m -l, which we tentatively assign to symmetric stretching of (Cr-0-Si), groups. The samples are crystalline materials and have expanded unit cells, as PXRD measurements pointed out. The as-synthesized sample shows a distribution of Cr sites, detected by EPR, comprising structure and channel occlusion sites; the nonstructural sites being extensively oxidized to Cr(V1) species after calcination in the presence of dioxygen. The changes in the photoacoustically measured physical properties, such as nonradiative relaxation time, the thermal diffusivity and optical absorption coefficient of both calcined and noncalcined chromium silicalite samples are also reported.Submitted by Santiago Fabio (fabio.ssantiago@hotmail.com) on 2013-09-17T18:46:28Z No. of bitstreams: 1 55555555555555.pdf: 2138002 bytes, checksum: 0f9db25e6b1b56b02befe62124b9ec02 (MD5)Approved for entry into archive by Vilma Conceição(vilmagc@ufba.br) on 2013-09-18T17:15:44Z (GMT) No. of bitstreams: 1 55555555555555.pdf: 2138002 bytes, checksum: 0f9db25e6b1b56b02befe62124b9ec02 (MD5)Made available in DSpace on 2013-09-18T17:15:44Z (GMT). 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dc.title.pt_BR.fl_str_mv Synthesis and Characterization of Chromium Silicalite
dc.title.alternative.pt_BR.fl_str_mv Chemistry of Materials
title Synthesis and Characterization of Chromium Silicalite
spellingShingle Synthesis and Characterization of Chromium Silicalite
Mambrim, José Silvio T.
Spectroscopy
Electron paramagnetic resonance
Silicalite
title_short Synthesis and Characterization of Chromium Silicalite
title_full Synthesis and Characterization of Chromium Silicalite
title_fullStr Synthesis and Characterization of Chromium Silicalite
title_full_unstemmed Synthesis and Characterization of Chromium Silicalite
title_sort Synthesis and Characterization of Chromium Silicalite
author Mambrim, José Silvio T.
author_facet Mambrim, José Silvio T.
Pastore, Heloise de Oliveira
Davanzo, Celso U.
Vichi, Eduardo Joaquim de Souza
Nakamura, Ossamu
Vargas, Helion
author_role author
author2 Pastore, Heloise de Oliveira
Davanzo, Celso U.
Vichi, Eduardo Joaquim de Souza
Nakamura, Ossamu
Vargas, Helion
author2_role author
author
author
author
author
dc.contributor.author.fl_str_mv Mambrim, José Silvio T.
Pastore, Heloise de Oliveira
Davanzo, Celso U.
Vichi, Eduardo Joaquim de Souza
Nakamura, Ossamu
Vargas, Helion
Mambrim, José Silvio T.
Pastore, Heloise de Oliveira
Davanzo, Celso U.
Vichi, Eduardo Joaquim de Souza
Nakamura, Ossamu
Vargas, Helion
dc.subject.por.fl_str_mv Spectroscopy
Electron paramagnetic resonance
Silicalite
topic Spectroscopy
Electron paramagnetic resonance
Silicalite
description Texto completo. Acesso restrito. p. 166-173
publishDate 1993
dc.date.issued.fl_str_mv 1993
dc.date.accessioned.fl_str_mv 2013-09-18T17:15:44Z
dc.date.available.fl_str_mv 2013-09-18T17:15:44Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://www.repositorio.ufba.br/ri/handle/ri/12996
dc.identifier.issn.none.fl_str_mv 0897-4756
identifier_str_mv 0897-4756
url http://www.repositorio.ufba.br/ri/handle/ri/12996
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Chemistry of Materials
publisher.none.fl_str_mv Chemistry of Materials
dc.source.pt_BR.fl_str_mv 10.1021/cm00026a004
dc.source.none.fl_str_mv reponame:Repositório Institucional da UFBA
instname:Universidade Federal da Bahia (UFBA)
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instname_str Universidade Federal da Bahia (UFBA)
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reponame_str Repositório Institucional da UFBA
collection Repositório Institucional da UFBA
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