Pd/C催化氧化木糖制备木糖酸  

Catalytic Oxidation of Xylose to Xylose Acid over Pd/C Catalyst

作　　者：刘敏[1,2] 汤婷婷[2,3] 赵国明[2] 张继文[1] 刘兴勇[3] 

机构地区：[1]西北农林科技大学,陕西杨凌712100 [2]中国科学院生物基材料重点实验室中国科学院青岛生物能源与过程研究所,山东青岛266101 [3]四川理工学院,四川自贡643000

出　　处：《化学反应工程与工艺》2014年第4期352-356,共5页Chemical Reaction Engineering and Technology

基　　金：国家自然科学基金(21206185);青岛科技发展计划(12-1-4-9-(3)-jch)

摘　　要：以水为溶剂,空气为氧化剂,采用Pd/C催化氧化木糖合成木糖酸,以KOH调节pH值,考察了pH值、反应温度、底物浓度、催化剂用量和催化剂回收次数等工艺参数对反应性能的影响。结果表明,在空气流速为0.4 L/min的条件下,取质量分数为5%的Pd/C催化剂1.0 g,当pH值为9,反应温度为50℃,木糖的初始浓度为0.4 mol/L(木糖和Pd物质的量之比为170),反应4 h,底物木糖转化率为99.2%,产物木糖酸选择性为99.1%。在该条件下,催化剂可以多次重复使用。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.

关 键 词：木糖酸 木糖 钯 炭催化剂 选择性氧化 

分 类 号：O643.38[理学—物理化学]