文献类型：期刊文献

英文题名：Production of methyl levulinate from cellulose: selectivity and mechanism study

作者：Ding, Daqian[1];Xi, Jinxu[1];Wang, Jianjian[1];Liu, Xiaohui[1];Lu, Guanzhong[1];Wang, Yanqin[1]

机构：[1]E China Univ Sci & Technol, Key Lab Adv Mat, Res Inst Ind Catalysis, Shanghai 200237, Peoples R China

年份：2015

卷号：17

期号：7

起止页码：4037

外文期刊名：GREEN CHEMISTRY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000357620900044)】；

基金：This project was supported financially by the NSFC of China (No. 21273071, 21403065), the Science and Technology Commission of Shanghai Municipality (13520711400, 13JC1401902, 10dz2220500), the Project Funds from China Postdoctoral Science Foundation, and the Fundamental Research Funds for the Central Universities, China.

语种：英文

摘要：The alcoholysis of cellulose into methyl levulinate (ML) in methanol media was investigated in the presence of several kinds of acid catalyst. One of the synthesized solid niobium-based phosphate catalysts was found to be highly efficient for the generation of ML, reaching an ML yield as high as 56%, higher than the LA yield (52%) in aqueous solution with the same reaction conditions as those used in our previous study (Green Chem., 2014, 16, 3846-3853). More interestingly, in water, very strong Lewis acid promoted the formation of LA; but in methanol, Bronsted acid enhanced the formation of ML. In-depth investigation showed that the mechanism and type of intermediates of cellulose alcoholysis in methanol were different from those in water and a high Bronsted/Lewis acid ratio (known as B/L acid ratio) of solid catalysts is needed to prevent the generation of by-products, namely, methyl lactate and 1,1,2-trimethoxyethane. This new-proposed reaction mechanism affected by the B/L acid ratio was very helpful for the design of efficient catalysts.