| Full text | |
| Author(s): |
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]
Total Authors: 6
|
| Affiliation: | [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
Total Affiliations: 2
|
| Document type: | Journal article |
| Source: | Reaction Kinetics Mechanisms and Catalysis; v. 132, n. 1 JAN 2021. |
| Web of Science Citations: | 0 |
| Abstract | |
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) | |
| FAPESP's process: | 15/20630-4 - Biorefinery development integrated to a bioethanol sugar cane plant with zero CO2 emission: routes to convert renewable resources to bio-products and bio-electricity |
| Grantee: | Rubens Maciel Filho |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 18/20532-0 - Use of niobium-based catalysts for dehydration of xylose to furfural in liquid phase: effects of reaction conditions on catalyst performance |
| Grantee: | Julia Letícia Montanari Lima |
| Support Opportunities: | Scholarships in Brazil - Scientific Initiation |