硅钨酸盐催化葡萄糖降解制备乙酰丙酸的研究  

Degradation of glucose to prepare levulinic acid catalyzed by silicotungstates

作　　者：王兰英[1] 庄军平[1] 周彦斌[1] 武书彬[1] 

机构地区：[1]华南理工大学制浆造纸工程国家重点实验室,广东广州510641

出　　处：《现代化工》2017年第9期143-145,共3页Modern Chemical Industry

摘　　要：制备了一系列硅钨酸盐(Ag_4SiW_(12)O_(40)、Zn_2SiW_(12)O_(40)、Cu_2SiW_(12)O_(40)、Al_(4/3)SiW_(12)O_(40))固体酸催化剂,并将4种不同的硅钨酸盐催化剂用于催化葡萄糖降解制备乙酰丙酸的实验中。采用FTIR、XRD和SEM等对该系列催化剂进行催化前后结构和性能的表征。FTIR和XRD分析结果表明,所合成的硅钨酸盐催化剂保持了硅钨酸的杂多酸结构,具有典型的Keggin结构;SEM图谱分析结果可以看出,新鲜催化剂颗粒表面光滑,粒子呈现出大面积规则的多面体形貌;催化剂重复使用3次后没有明显大面积规则的多面体形貌,具有明显簇状细小颗粒。在硅钨酸盐催化剂质量为0.5 g、40 mL的10 g/L的葡萄糖溶液中,120℃下反应2 h,Al_(4/3)SiW_(12)O_(40)所得目标产物乙酰丙酸得率最高可达34.57%。A series of silicotungstates catalysts（ Ag4SiW（12）O（40）,Zn2SiW（12）O（40）,Cu2SiW（12）O（40）,Al（4/3）SiW（12）O（40）） are prepared,and all of them are used in the catalytic degradation of glucose to produce levulinic acid. These silicotungstate catalysts are all characterized by FTIR,XRD and SEM before and after catalytic reaction.FTIR and XRD analysis results reveal that they all silicotungstate catalysts retains heteropolyacid＇s structure from silicotungstic acid,with typical Keggin structure; SEM spectra show that fresh catalyst particles have smoother surface and exhibit large area of regular polyhedron shape; the catalysts are of obvious clusters of tiny particles instead of large area of regular polyhedron shape after they have been used for three times.It is found that the highest yield of levulinic acid can reach 34. 57% under the conditions of Al（4/3）SiW（12）O（40） dosage at 0. 5 g,40 ml glucose solution with concentration of 10 g·L-1,reaction temperature at 120℃ and reaction time being 2 h.

关 键 词：乙酰丙酸 葡萄糖 硅钨酸盐 降解 

分 类 号：TQ35[化学工程]