固体酸SO42-/TiO2催化葡萄糖制备乙酰丙酸甲酯

通过沉淀.浸渍法制备了一系列不同焙烧温度的SO<,4><'2->/TiO<,2>固体酸催化剂,用于在甲醇中催化转化葡萄糖制备乙酰丙酸甲酯,探讨了不同反应条件及催化剂重复使用次数对乙酰丙酸甲酯得率的影响,并利用XRD和NH<,3>-TPD对使用前后的催化剂的结构和酸性进行了表征.实验结果表明:500℃焙烧3h的催化剂,在...

Solid Acid SO42-/TiO2 Catalyzed Glucose Conversion to Methyl Levulinate

A series of SO42-/TiO2 solid acid catalysts were prepared at different calcination temperatures by the precipitation and impregnation method.The catalysts were used to catalyze glucose conversion to methyl levulinate in methanol.The influence of different reaction conditions and catalyst reuse cycle on methyl levulinate yield was investigated.The surfaces structure and acidity changes of the fresh and used catalysts were characterized by XRD and NH3-TPD.Experimental results showed that methyl levulinate yield of 35 mol% could be obtained under the conditions of the catalyst calcined at 500 ℃ for 3 h,catalyst dosage 2.5 wt%,reaction temperature 200 ℃and reaction time 2 h.The catalytic activity decreased obviously for the first recovered catalyst after calcination,while there were relatively stable reaction activities in the following several reuse.The XRD and NH3-TPD results illustrated that the catalyst crystallization structure was preserved after reuse,the acid strength and total amounts of acid gradually decreased with increasing reuse times.