H_2SO_4改性凹凸棒土在葡萄糖脱水制备5-羟甲基糠醛过程中的催化性能研究

Study on catalytic performance of H_2SO_4 modified attapulgite in the process of dehydration of glucose to prepare 5-hydroxymethylfurfural

对经H2SO4改性的凹凸棒土作为固体酸催化剂时,其在葡萄糖脱水制备生物基平台化合物5-羟甲基糠醛(HMF)过程中的催化性能进行研究,结果表明:凹凸棒土经不同浓度H2SO4改性后,Bronsted酸位点显著增加,当H2SO4浓度为1. 0 mol/L时,同时具有较多的Bronsted酸位点和Lewis酸位点,此时催化葡萄糖脱水制备HMF效果最好,其收率可达46. 6%.该催化剂在含水体系中表现出良好的稳定性,催化剂重复使用4次,HMF收率均在46%以上,活性未发生明显改变.

The attapulgite modified by H2 SO4 was used as a solid acid catalyst to study the dehydration of the bio-based platform compound 5-hydroxymethylfurfural( HMF). The results showed that the Bronsted acid sites increased when the attapulgite was modified by different concentrations of H2 SO4. When the concentration of H2 SO4 was 1. 0 mol/L,there were more Bronsted acid sites and Lewis acid sites. The preparation of HMF had the best effect,and the yield could reach 46. 6%. The catalyst showed good stability in the aqueous system.Repeated use of the catalyst for 4 times,the HMF yield was above 46%,and the activity did not change significantly.