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BIBTEX RIS

Production of xylitol from acidic hydrolysates of lignocellulosic biomass by catalytic hydrogenation over a Ni–Ru/C catalyst

2021; Elsevier BV; Volume: 174; Linguagem: Inglês

10.1016/j.cherd.2021.07.025

1876-4800

Santulla Leide Bernardes Vasconcelos Carvalho, Eliane Bezerra de Moraes Medeiros, Ayrton de Souza Wanderley, Luccas de Moura Ribeiro, Júlia Gabriela da Silva, Ivana Taciana de Almeida Simões, Nathalia Cecília do Rego Lemos, Nelson Joaquim Ribeiro Neto, César Augusto Moraes de Abreu, Henrique Macedo Baudel, Nelson Medeiros de Lima Filho,

Supercapacitor Materials and Fabrication

Acid hydrolysis and hydrogenation reactions were capable to convert xylose obtained from biomass materials using heterogeneous catalysts based on Ni and Ru. Xylose was extracted from sugar cane bagasse using dilute acid sulfuric solutions, and then xylitol was obtained through xylose catalytic hydrogenation. A bimetallic catalyst (Ni 10.0 wt.% and Ru 1.0 wt.%) was prepared by the wet impregnation method, supporting the metallic phase in activated carbon. Sugarcane bagasse was delignified in a three-step pretreatment (acid, basic and organic extractions, respectively), allowing effective hydrolysis of the resulting holocellulose. The acid hydrolysis process for xylose extraction was more effective at the highest concentration of sulfuric acid in the study (2.5% v/v), obtaining a xylose-rich hydrolysate with concentration over 10 g L−1. For the xylose hydrogenation process, conversion of xylose and selectivity to xylitol was near 90 % after 1 h of reaction. Kinetic evolutions were evaluated through a mathematical model in terms of operating time and temperature, providing hydrogenation activation energy values of the order of 40.76 kJ mol−1.