Au/TS-1催化剂上葡萄糖氧化  

Glucose oxidation over Au/TS-1 catalyst

作　　者：唐月[1] 朱明乔[1] 黄霖[1] 王萌[1] 陈新志[1] 

机构地区：[1]浙江大学化学工程与生物工程学系,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2013年第6期1114-1119,1128,共7页Journal of Zhejiang University：Engineering Science

基　　金：浙江省自然科学基金资助项目(Y4080247);浙江省自然科学基金杰出青年团队资助项目(R40903580);广西石化资源加工及过程强化技术重点实验室开放课题基金资助项目(K002)

摘　　要：针对传统的生物发酵法制备葡萄糖酸钠周期长、选择性低、温度控制要求高等缺点,采用3种方法制备了Au/TS-1催化剂,进行比表面积(BET)测定、X射线衍射(XRD)和透射电镜(TEM)表征,用于以氧气为氧化剂葡萄糖氧化制备葡萄糖酸钠,评价了催化性能,并进行反应条件影响考察.结果显示:使用沉积沉淀法制备的质量分数为4%的Au/TS-1催化效果最佳,纳米金颗粒大小在10～20nm,纳米金颗粒分布均匀,其最佳反应条件为60℃,pH 9.5,氧气流量为40mL/min,催化剂0.18g,水溶液中葡萄糖的质量分数为5%,葡萄糖最快在23min内选择性及转化率均可达到100%,但催化剂在第4次重复利用后,其活性降低很快.研究表明:沉积沉淀法能制备一定纳米金颗粒大小的Au/TS-1催化剂,在该多相催化剂上葡萄糖氧化制备葡萄糖酸钠时间短、活性高、选择性好,但稳定性有待提高.Aiming at the disadvantages of long cycle, low selectivity and high level control of temperature in the production of sodium gluconate by traditional biological fermentation method, Au/TS-1 nano catalysts were prepared by three kinds of method and characterized by surface area and pore volume using nitrogen adsorption using BET method, X-ray diffraction （XRD） and transmission electron microscopy （TEM）. The catalytic performance of the catalysts used in oxidation of glucose to sodium gluconate using oxygen as an oxidant was evaluated, and effects of reaction conditions were investigated. The results showed that the Au/TS-1 catalyst with gold mass fraction of 4% prepared by deposition precipitation （DP） method was the best catalyst with the uniform nano gold mean particle size of 10-20 nm, and the optimum reaction conditions were at 60℃, pH of 9.5, oxygen flowrate of 40 mL/min, catalyst weight of 0.18 g, and glucose mass fraction of 5%, at which the glucose conversion of 100% and the sodium gluconate selectivity of 100% could be obtained at 23 min, but the catalytic activity was decreased rapidly after the fourth reuse. It is concluded that the heterogeneous Au/TS-1 catalysts prepared by DP method with a given size of nano gold particle show advantages of short cycle, high activity and good selectivity, but their stability needs to be improved.

关 键 词：葡萄糖氧化 AU TS-1催化剂 纳米金颗粒 沉积沉淀法 

分 类 号：O643.32[理学—物理化学]