Use of amorphous Nb2O5 and Nb2O5/Al2O3 as acid catalysts for the dehydration of xylose to furfural

Autor(es)

de Lima, Leticia Franzo ^[1] ; Lima, Julia Leticia Montanari ^[1] ; Jorqueira, Diogo Silva Sanches ^[1] ; Landers, Richard ^[2] ; Moya, Silvia Fernanda ^[1] ; Suppino, Raphael Soeiro ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Sch Chem Engn, Dept Proc Engn, 500 Albert Einstein Ave, BR-13083852 Campinas, SP - Brazil

^[2] Univ Estadual Campinas, Gleb Wataghin Inst Phys, Dept Appl Phys, 777 Sergio Buarque de Holanda St, BR-13083859 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Reaction Kinetics Mechanisms and Catalysis; v. 132, n. 1 JAN 2021.
• Citações Web of Science: 0

Resumo

This work compared the catalytic performance of the amorphous Nb2O5 (NB) and 12 wt% Nb2O5/Al2O3 (NB-AL) catalysts for the xylose dehydration to furfural carried out for 6 h at 140 and 160 degrees C using water or a 1:0.8 (v/v) water/isopropanol mixture as solvents. The solids were characterized by XRD, N-2 adsorption, TGA, XPS, TPD-NH3 and FTIR-Pyridine. Results indicated a specific surface area of 144 and 108 m(2)/g and an average pore diameter of 44 and 76 angstrom to NB and NB-AL respectively. The solids presented similar density of acid sites (6.0 for NB and 5.7 mu molNH(3)/m(2) for NB-AL), but different strength distribution of the acid sites. Moreover, the fraction of Bronsted acid sites on NB was 27%, whereas on NB-AL it was only 2%. Concerning the catalytic tests, the highest conversion of xylose for NB and NB-AL (99.0 and 91.1%, respectively) was achieved for the reactions at 160 degrees C in water/isopropanol mixture, whilst the highest selectivities to furfural were obtained in reactions with water at 160 degrees C (60.1% to NB and 35.1% to NB-AL). Finally, using water as solvent, the selectivity to furfural increased with both catalysts at the highest temperature, though the carbon balance decreased. (AU)

• Processo FAPESP: 15/20630-4 - Desenvolvimento integrado de biorrefinaria e planta de bioetanol de cana-de-açúcar com emissão zero de CO2: rotas para converter recursos renováveis em bioprodutos e bioeletricidade
• Beneficiário: Rubens Maciel Filho
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 18/20532-0 - Uso de catalisadores à base de nióbio para a desidratação da xilose a furfural em fase líquida: efeitos das condições reacionais sobre o desempenho do catalisador
• Beneficiário: Julia Letícia Montanari Lima
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica