苯改性催化剂催化纤维素水解选择性制葡萄糖  

Benzene-modified catalyst improving glucose selectivity in cellulose hydrolysis

作　　者：刘阳 李文志 LIU Yang;LI Wen-zhi(School of Engineering Science,University of Science and Technology of China,Hefei 230026,Anhui Province,China)

机构地区：[1]中国科学技术大学工程科学学院,安徽合肥230026

出　　处：《化学工程》2020年第7期1-5,共5页Chemical Engineering(China)

基　　金：国家自然科学基金资助项目(51676178);国家重点基础研究发展计划(2018YFB1501601)。

摘　　要：为了提高纤维素水解中产物葡萄糖的选择性,利用苯胺的重氮化反应对催化剂表面枝接苯环进行改性。首先通过原位漫反射傅里叶变换红外光谱(DRIFTS)比较了催化剂表面的葡萄糖吸附量,证明了苯环改性后的催化剂对葡萄糖的吸附作用降低。然后进行了葡萄糖水热实验,结果表明改性后的催化剂相较改性前能够更好地减缓葡萄糖的转化和降解。最后使用改性前后的催化剂分别进行了纤维素水解实验,当苯环改性的固体酸催化剂催化纤维素水解时,得到了55.11%的葡萄糖产率和95.98%的葡萄糖选择性,高于使用未改性催化剂的29.53%葡萄糖产率和82.33%葡萄糖选择性。结果表明:利用苯环对催化剂表面改性可以提高纤维素水解中产物葡萄糖的选择性。In order to improve the selectivity of glucose in cellulose hydrolysis,the diazotization reaction of aniline was used to modify the surface of catalyst to introduce benzene rings on it.The in situ diffuse reflectance FTIR spectroscopy(DRIFTS)was used to compare the glucose adsorption ability of modified or non-modified catalysts.The results proved that modification by benzene ring on the catalyst could weaken the adsorption of glucose.Then,glucose hydrothermal experiments with two catalysts were performed.The results showed that modified catalyst could slow down the glucose conversion and degradation.At last,cellulose hydrolysis was performed using the modified and non-modified catalyst,respectively.The glucose yields on modified and non-modified catalyst were 55.11%and 29.53%,while the selectivity of glucose was 95.98%and 82.33%,respectively.These results indicate that the surface modification of the catalyst with benzene rings can improve the selectivity of glucose in cellulose hydrolysis.

关 键 词：苯环 葡萄糖选择性 表面改性 纤维素水解 

分 类 号：TQ021.1[化学工程] TQ021.3