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以含铬化合物为前驱体,以Al2O3为载体,通过浸渍法制得了Cr(Ⅲ)-Al2O3催化剂,并将其用于催化果糖脱水生成5-羟甲基糠醛的反应中。研究了不同的制备条件,如不同的含铬化合物的前驱体、Cr的负载量和催化剂的干燥温度对催化剂催化活性的影响。结果发现以CrCl3为前驱体,Cr的负载量为17.5wt%,催化剂干燥温度为80℃时,Cr(Ⅲ)-Al2O3催化剂催化活性最高。考察了以Cr(Ⅲ)-Al2O3为催化剂时,不同的反应条件对果糖脱水反应的影响。结果发现以1-丁基-3-甲基咪唑氯盐([Bmim]Cl)为溶剂,以Cr(Ⅲ)-Al2O3为催化剂,在100℃时反应40min,HMF的产率可达到93.1%。
Cr (Ⅲ) -Al2O3 catalyst was prepared by impregnation method using chromium-containing compound as precursor and Al2O3 as carrier. The catalyst was used to catalyze the dehydration of fructose to 5-hydroxymethylfurfural. Different preparation conditions were investigated, such as the effect of different chromium-containing precursors, the loading of Cr and the drying temperature on the catalytic activity of the catalysts. The results show that Cr (Ⅲ) -Al2O3 catalyst has the highest catalytic activity with CrCl3 as precursor, a loading of Cr of 17.5wt% and a catalyst drying temperature of 80 ℃. The effects of different reaction conditions on the dehydration reaction of fructose with Cr (Ⅲ) -Al2O3 as catalyst were investigated. The results showed that the yield of HMF could reach 93.1% with 100 mol / L Cr (Ⅲ) -Al2O3 as catalyst and [Bmim] Cl as solvent.