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

Autor(es)

Possato, Luiz G. ^[1] ; Cassinelli, Wellington H. ^[1] ; Garetto, Teresita ^[2] ; Pulcinelli, Sandra H. ^[1] ; Santilli, Celso V. ^[1] ; Martins, Leandro ^[1]

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

• Tipo de documento: Artigo Científico
• Fonte: APPLIED CATALYSIS A-GENERAL; v. 492, p. 243-251, FEB 25 2015.
• Citações Web of Science: 33

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
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 10/01449-3 - Desenvolvimento de catalisadores heterogêneos porosos para a conversão de matérias-primas renováveis
• Beneficiário: Leandro Pierroni Martins
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores