Catalytic Oxidation of Xylose to Xylose Acid over Pd/C Catalyst
1. Northwest A & F University, Yangling 712100, China; 2. CAS Key Laboratory of Bio-based Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China; 3. Sichuan University of Science & Engineering, Zigong 643000, China
Abstract Using air as oxidant and water as solvent，the effects of pH value, reaction temperature, substrate concentration, catalyst dosage and cycle times on the performances of Pd/C catalyst in the catalytic oxidation of xylose to xylose acid were investigated. Under the conditions of air velocity 0.4 L/min, mass faction of Pd/C catalyst (mass fraction 5%) 1.0 g, pH value 9, reaction temperature 50 ℃, initial concentration of xylose 0.4 mol/L and reaction time 4 h, the conversion of substrate and selectivity of xylose acid reached 99.2% and 99.1%, respectively. Under the appropriate conditions, the Pd/C catalyst could be recovered and used several times.
