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

Autor(es)

Possato, Luiz G. ; Chaves, Thiago F. ; Cassinelli, Wellington H. ; Pulcinelli, Sandra H. ; Santilli, Celso V. ; Martins, Leandro

• 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: 13/50023-7 - Combinação de técnicas espectrópicas resolvidas no tempo aplicadas ao estudo estrutural de catalisadores com porosidade hierárquica
• Beneficiário: Leandro Pierroni Martins
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 13/10204-2 - Desidratação oxidativa do glicerol a ácido acrílico em uma única etapa empregando-se catalisadores bifuncionais
• Beneficiário: Luiz Gustavo Possato
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• 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
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado