Characterization and acidic properties of AlMCM-41 prepared by conventional and post-synthesis alumination

Página do item simplificado Estatísticas
dc.contributor.authorNascimento, Rubens Maribondo do
dc.contributor.authorCosta, Maria José Fonseca
dc.contributor.authorChellappa, Thiago
dc.contributor.authorAraujo, Antonio Souza de
dc.contributor.authorFonseca, Viviane Muniz
dc.contributor.authorFernandes Júnior, Valter José
dc.contributor.authorPacheco, Jose G. A.
dc.date.accessioned2022-01-31T15:15:21Z
dc.date.available2022-01-31T15:15:21Z
dc.date.issued2015
dc.description.resumoThe catalysts analysed in the current work are variations of MCM-41. The properties of these highly ordered mesoporous aluminosilicates were adjusted by an isomorphous substitution of Si by a trivalent cation, in this case Al3þ, generating catalysts of the AlMCM-41 type. The materials were synthesized with a silicon/aluminium ratio of 40, through two methods of impregnation of the metal: conventional and post-synthesis alumination. With the aim of determining the density of the acid sites of the Al40MCM-41 prepared by post-synthesis and conventional alumination, studies of the adsorption of n-butylamine probe molecule were carried out. Further, the studied material was characterized by thermogravimetry measurements, providing the profile of decomposition of the samples, which allowed calculation of the densities of the acid sites. The model-free kinetic algorithms were applied in order to determinate conversion and apparent activation energy. Comparison of energy-dispersive X-ray fluorescence and X-ray photoelectron spectroscopy measurements indicated that the post-synthesis method was more favourable based on the metal positioning, ‘anchored’ in the surface of the catalyst. The textural properties of the calcined Al40MCM-41 prepared by post-synthesis and conventional alumination were characterized by X-ray diffraction, N2 isothermal adsorption measurements (Brunauer– Emmett–Teller and Barrett–Joyner–Halenda), transmission electron microscopy, and X-ray photoelectron spectroscopy.pt_BR
dc.identifier.citationCOSTA, Maria José Fonseca; CHELLAPPA, Thiago; ARAÚJO, Antonio Souza de.; FONSECA, Viviane Muniz; FERNANDES JÚNIOR, Valter José; NASCIMENTO, Rubens Maribondo do; PACHECO, José G. A. Characterization and acidic properties of AlMCM-41 prepared by conventional and post-synthesis alumination. Australian Journal of Chemistry, [S.l.], v. 68, n. 1, p. 99, 2015. CSIRO Publishing. http://dx.doi.org/10.1071/ch13679. Disponível em: https://www.publish.csiro.au/ch/CH13679. Acesso em: 07 abr. 2021.pt_BR
dc.identifier.doihttp://dx.doi.org/10.1071/ch13679
dc.identifier.issnPrint: 0004-9425
dc.identifier.issnElectronic: 1445-0038
dc.identifier.urihttps://repositorio.ufrn.br/handle/123456789/45739
dc.languageenpt_BR
dc.publisherAustralian Journal of Chemistrypt_BR
dc.subjectacidic properties of AlMCM-41pt_BR
dc.subjectpost-synthesis aluminationpt_BR
dc.subjectsiliconpt_BR
dc.subjectaluminiumpt_BR
dc.titleCharacterization and acidic properties of AlMCM-41 prepared by conventional and post-synthesis aluminationpt_BR
dc.typearticlept_BR

Arquivos

Pacote Original

Agora exibindo 1 - 1 de 1
Nenhuma Miniatura disponível
Nome:
CharacterizationAndAcidic_NASCIMENTO_2015.pdf
Tamanho:
650.47 KB
Formato:
Adobe Portable Document Format
Nenhuma Miniatura disponível
Baixar

Licença do Pacote

Agora exibindo 1 - 1 de 1
Nenhuma Miniatura disponível
Nome:
license.txt
Tamanho:
1.45 KB
Formato:
Item-specific license agreed upon to submission
Nenhuma Miniatura disponível
Baixar

Coleções

CT - DEMAT - Artigos publicados em periódicos
CT - DET - Artigos publicados em periódicos
IQ - Artigos publicados em periódicos
Repositório Institucional - UFRN Campus Universitário Lagoa NovaCEP 59078-970 Caixa postal 1524 Natal/RN - BrasilUniversidade Federal do Rio Grande do Norte© Copyright 2025. Todos os direitos reservados.
Contato+55 (84) 3342-2260 - R232Setor de Repositórios Digitaisrepositorio@bczm.ufrn.br
DSpaceIBICT
OasisBR
LAReferencia
Customizado pela CAT - BCZM