摘要
合成一种咪唑-磷钨酸杂化固体酸1-(3-磺酸基)丙基-3-甲基咪唑磷钨酸盐([MIMPS]_3PW_(12)O_(40)),并将其应用于催化纤维素的水解反应之中。与H_2SO_4,HCl,对甲苯磺酸(p-TSA)以及H_3 PW_(12)O_(40)相比,[MIMPS]_3PW_(12)O_(40)的催化活性与反应选择性都更佳。通过单因素法对反应温度、反应时间、催化剂用量、固液比等进行考察与优化,结果发现:在453 K下,n([MIMPS]_3PW_(12)O_(40)):n(纤维素)=5.8%时,即可极大地促进纤维素链的断裂、解离和水合;水解反应仅3 h后,还原糖和葡萄糖的产率分别为34.0%,21.0%。此外,调节反应体系的pH值约为2时,催化剂以固体沉淀的方式得以回收,且经过5次重复利用后仍能保持良好的催化性能。
A kind of imidazolium-phosphotungstate hybrid solid acid had been synthesized,which was 1-（3-sulfonic acid） propyl-3-methyl imidazolium phosphotungstate （[MIMPS] 3PW12O40）,and then it was applied into the catalytic hydrolysis of cellulose.[MIMPS]3PW12O40 showed higher catalytic activity and selectivity than H2SO4,HCl,p-toluenesulfonic acid （p-TSA） as well as H3PW12O40.The effect factors of the hydrolysis of cellulose had been investigated and optimized in details,such as reaction temperature,reaction time,catalyst dosage and solid-to-liquid ratio.The results illustrated that the optimized reaction conditions were described as follows：the hydrolysis of cellulose was catalyzed by 5.8％ （mol） of [MIMPS] 3PW12O40 for 3 h at 453 K in water,affording total reducing sugar（TRS） and glucose in 34.0％ and 21.0％ yield,respectively,wherein chain rupturion,dissociation and hydration of cellulose were promoted greatly by the n （[MIMPS] 3 PW12 O40） ∶ n （cellulose） =5.8 ％.Furthermore,the catalyst [MIMPS] 3 PW12O40 had been recycled from the reaction system through a simple method of adjusting pH value to around 2 after quenching the reaction,which was reused for five times with little loss of activity.
出处
《江南大学学报（自然科学版）》
CAS
2014年第3期343-348,共6页
Joural of Jiangnan University (Natural Science Edition)
基金
国家自然科学基金项目(21206057)
江苏省自然科学基金项目(BK2012118)
浙江省有机化学与皮革化工重中之重学科开放基金项目(100061200115)
关键词
纤维素
咪唑-磷钨酸杂化固体酸
水解
还原糖
葡萄糖
cellulose
imidazolium-phosphotungstate hybrid solid acid
hydrolysis
total reducing sugar
glucose
