【摘要】 探索了以固体超强酸SO42-/TiO2为催化剂,催化木糖脱水环化制备糠醛的新方法.以TiCl4乙醇溶液(体积比1∶1)作为钛源、以浓氨水作为沉淀剂制备二氧化钛,硫酸溶液作为浸渍液,制备了SO42-/TiO2固体超强酸.采用二溴化法(溴酸钠-溴化钠)对糠醛产量进行分析,研究了反应条件和催化剂制备过程中硫酸浸渍液浓度、焙烧温度等对糠醛产率的影响.结果表明,使用固体超强酸作催化剂,在最佳条件下,糠醛产率达到42.6%,而同样条件下用硫酸作催化剂糖醛产率只有15.6%.更多还原

【Abstract】 Dehydration of xylose into furfural was performed with solid super acid(SO42/TiO2) as catalyst.The preparation of SO42-/TiO2 was made using TiCl4 in alcohol(V(TiCl4)∶V(alcohol)=1∶1) as titanium source,strong ammonia as precipitant and H2SO4 as impregnating solution.Dehydration of xylose into furfural was carried out in 25 mL degestion tube with oil-bath heating.The yield of furfural were determined in the method of two brominated(sodium bromate-sodium bromide).The conditions of preparation of furfural and the influence of its yield were researched.The results show that the catalyst is essential in the preparation of furfural for xylose dehydration reaction.The yield of furfural reaches to 42.6 % when solid super acid SO42-/TiO2 used as catalyst,while it is only 15.6 % at the same conditions using H2SO4 as catalyst.更多还原