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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.)

One-step glycerol oxidehydration to acrylic acid on multifunctional zeolite catalysts

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Autor(es):
Possato, Luiz G. [1] ; Cassinelli, Wellington H. [1] ; Garetto, Teresita [2] ; Pulcinelli, Sandra H. [1] ; Santilli, Celso V. [1] ; Martins, Leandro [1]
Número total de Autores: 6
Afiliação do(s) autor(es):
[1] UNESP Univ Estadual Paulista, Inst Quim, BR-14800060 Araraquara, SP - Brazil
[2] Inst Invest Catalysis & Petrochem, RA-2654 Santiago Del Estero, Santa Fe - Argentina
Número total de Afiliações: 2
Tipo de documento: Artigo Científico
Fonte: APPLIED CATALYSIS A-GENERAL; v. 492, p. 243-251, FEB 25 2015.
Citações Web of Science: 34
Resumo

The catalytic behavior of bifunctional V2O5/MFI catalysts with acid and oxidizing properties was investigated for the gas-phase oxidehydration of glycerol. One of the main reaction products was acrylic acid, produced by dehydration of glycerol to acrolein at an acidic site and subsequent oxidation at a redox site. Comparison of wet impregnation with vanadyl sulfate (VOSO4) and ammonium metavanadate (NH4VO3) showed that VOSO4 impregnation provided the best performance for the conversion of glycerol and selectivity towards acrylic acid. The chemical and structural properties of the catalysts were studied by X-ray diffraction, nitrogen adsorption desorption isotherms, Raman spectroscopy, temperature programmed ammonia desorption, and X-ray absorption spectroscopy in the XANES region for the K-edge absorption of vanadium. XPS measurements of the fresh and spent catalysts enabled elucidation of the dynamic redox cycles of vanadium oxide during oxidation of acrolein. The presence of vanadium in the zeolite improved the catalyst lifetime, because of the multifunctional ability of the vanadium oxide species to convert acrolein to acrylic acid and act as co-catalyst for the oxidation of coked glycerol products. Qualitative and quantitative analyses of the coke deposited in the spent catalysts were performed using C-13 NMR and thermogravimetry, respectively. (C) 2014 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: 10/01449-3 - Desenvolvimento de catalisadores heterogêneos porosos para a conversão de matérias-primas renováveis
Beneficiário:Leandro Martins
Linha de fomento: Auxílio à Pesquisa - Apoio a Jovens Pesquisadores