| Texto completo | |
| Autor(es): |
Possato, Luiz G.
;
Acevedo, Mauro D.
;
Padro, Cristina L.
;
Briois, Valerie
;
Passos, Aline R.
;
Pulcinelli, Sandra H.
;
Santilli, Celso V.
;
Martins, Leandro
Número total de Autores: 8
|
| Tipo de documento: | Artigo Científico |
| Fonte: | MOLECULAR CATALYSIS; v. 481, p. 9-pg., 2020-02-01. |
| Resumo | |
This paper describes the activation and catalytic performance of a multifunctional catalyst consisting of mixed oxides of vanadium and molybdenum supported on an acidic ZSM-5 zeolite. The zeolite was wet-impregnated with an aqueous solution containing a mixture of NH4VO3 and (NFL4)(6)MO7O24 precursors at a V/(Mo + V) molar ratio of 0.6. Evolution of the phases during activation (by calcination under 20% O-2/He) was followed by synchrotron X-ray diffraction (XRD), but detection of mixed oxides of MoxVyOz was difficult, due to the high degree of dispersion on the zeolite surface. On the other hand, X-ray absorption spectroscopy (XAS) performed simultaneously at the Mo and V K-edges enabled confirmation of formation of the MoV2O8 phase on the acidic ZSM-5 zeolite. The combination of the MoV2O8 phase and the zeolite acid sites produced a highly active catalyst for gas phase glycerol dehydration-oxidation coupled reactions in which acrylic acid was the main product. The multifunctional catalyst presented only 6% of deactivation during a period of 8 h under glycerol stream, while the activities of the bulk mixed oxide and the pure ZSM-5 zeolite decreased by almost 20 and 31%, respectively. (AU) | |
| Processo FAPESP: | 16/10597-2 - Transformação catalítica do glicerol a partir de reações de desidratação e oxidação acopladas com o uso de catalisadores heterogêneos multifuncionais |
| Beneficiário: | Leandro Pierroni Martins |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |
| 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 |