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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

The multiple benefits of glycerol conversion to acrolein and acrylic acid catalyzed by vanadium oxides supported on micro-mesoporous MFI zeolites

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Autor(es):
Possato, Luiz G. ; Chaves, Thiago F. ; Cassinelli, Wellington H. ; Pulcinelli, Sandra H. ; Santilli, Celso V. ; Martins, Leandro
Número total de Autores: 6
Tipo de documento: Artigo Científico
Fonte: CATALYSIS TODAY; v. 289, p. 20-28, JUL 1 2017.
Citações Web of Science: 13
Resumo

The ZSM-5 zeolite (MFI structure, Si/Al = 40) was treated using NaOH and either oxalic acid or HCl to obtain hierarchical materials with different characteristics, followed by impregnation with vanadium oxides (V2O5) to generate redox-active sites. The impact of the multiple treatments on the efficiency and stability of the catalysts in the conversion of glycerol to acrolein and acrylic acid was investigated and correlated with catalyst porosity, acidity, and chemical composition. The treated and impregnated V2O5 catalysts were subjected to XRD, 27Al NMR, nitrogen physisorption, TPD-NH3, TG, and IJV Vis analyses, in order to associate the properties of the catalysts with their activities. The studies showed that the catalytic performance of the materials depended on the acidic and textural properties of the zeolites, which influenced both the dispersion of V2O5 and its interaction with the acid sites of the supporting zeolites. All the catalysts provided conversion values exceeding 65%, even after 6 h on glycerol stream. The distribution of products strongly reflected the effects of pore formation, acid treatment with oxalic acid or HCI, and the presence of vanadium oxide. The effects of these modifications resulted in higher selectivity to acrolein and acrylic acid, a reduced rate of coke accumulation in the zeolite, and a longer catalyst lifetime. (C) 2016 Elsevier B.V. All rights reserved. (AU)

Processo FAPESP: 13/10204-2 - Desidratação oxidativa do glicerol a ácido acrílico em uma única etapa empregando-se catalisadores bifuncionais
Beneficiário:Luiz Gustavo Possato
Linha de fomento: Bolsas no Brasil - Doutorado
Processo FAPESP: 13/50023-7 - Combinação de técnicas espectrópicas resolvidas no tempo aplicadas ao estudo estrutural de catalisadores com porosidade hierárquica
Beneficiário:Leandro Martins
Linha de fomento: Auxílio à Pesquisa - Regular
Processo FAPESP: 14/11952-5 - Estudo da formação de materiais hierárquicos ordenados por uma estrutura supramolecular em emulsões utilizando precursores zeolíticos
Beneficiário:Thiago Faheina Chaves
Linha de fomento: Bolsas no Brasil - Pós-Doutorado