摘要
在间歇搅拌反应釜中,以磷酸改性的γ-Al2O3作为固体酸催化剂,在水和仲丁醇组成的两相体系中对葡萄糖脱水制备生物基平台化合物5-羟甲基糠醛(5-hydroxymethylfurfural, HMF)进行研究。考察了磷酸浓度和催化剂用量对葡萄糖转化率和HMF收率的影响。结果表明,氧化铝未经磷酸改性时,催化葡萄糖转化HMF收率仅为18.1%,经1 mol·L^-1磷酸改性后,HMF收率可达34.1%。根据吡啶原位红外和程序升温热重分析结果可以得知,磷酸改性后γ-Al2O3催化剂表面出现Lewis酸位点,且γ-Al2O3稳定性增加,从而使其催化葡萄糖脱水制备HMF催化活性增强。该催化剂在含水体系中表现出良好的稳定性,催化剂重复使用四次后,活性基本不变。
5-Hydroxymethylfurfural(HMF) was synthesized from glucose catalyzed by H3PO4 modifiedγ-Al2O3 in a batch reactor with water/2-butanol biphasic solvent. Effects of H3 PO4 concentration and catalyst amount on glucose conversion and HMF yield were investigated. The results show that HMF yield is 18.1%when catalyzed by γ-Al2O3, which increases to 34.1% when catalyzed by γ-Al2O3 modified with 1 mol×L^-1 H3 PO4. Pyridine-IR spectra and temperature-programmed thermogravimetry show that Lewis acid sites appear on γ-Al2O3 and its stability is enhanced after H3 PO4 treatment, which is responsible for the enhanced catalytic activity. Moreover, the catalyst show good stability in aqueous systems, and there are no apparent decline of catalytic activity after 4 reaction cycles.
作者
杨凤丽
姚鹏飞
王树巍
YANG Feng-li;YAO Peng-fei;WANG Shu-wei(School of Chemical and Environmental Engineering,Jiangsu University of Technology,Changzhou 213001,China)
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2019年第4期1012-1017,共6页
Journal of Chemical Engineering of Chinese Universities
基金
国家自然科学基金(21406020)
江苏省自然科学基金(BK20140257)
