文献类型：期刊文献

英文题名：High-yield production of levulinic acid from cellulose and its upgrading to γ-valerolactone

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

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

年份：2014

卷号：16

期号：8

起止页码：3846

外文期刊名：GREEN CHEMISTRY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000340017000024)】；

基金：This project was supported financially by the NSFC of China (no. 21101063 and 21273071), the Science and Technology Commission of Shanghai Municipality (13520711400, 13JC1401902, 10dz2220500) and the Fundamental Research Funds for the Central Universities, China.

语种：英文

摘要：Direct catalytic conversion of cellulose to levulinic acid (LA) by niobium-based solid acids and further upgrading to gamma-valerolactone (GVL) on a Ru/C catalyst were realized through sequential reactions in a reactor. Firstly, using aluminium-modified mesoporous niobium phosphate as a catalyst, cellulose can be directly converted to LA with as high as 52.9% yield in aqueous solution, even in the presence of the Ru/C catalyst. To the best of our knowledge, this is the best result over a heterogeneous catalyst so far. It was found that the type of acid (Lewis and Bronsted acids) and acid strength had an influence on the yield of LA; the doping of aluminium can enhance the strong Lewis and Bronsted acids, especially the strong Lewis acid, thus resulting in the increase of LA yield from cellulose as well as from glucose and HMF. Such an enhancement by a Lewis acid on LA yield from HMF was further confirmed by adding lanthanum trifluoroacetate [(TfO)(3)La], a strong Lewis acid, in the catalytic system (HCl, (TfO)(3)H, niobium phosphate), indicating that a suitable ratio of Lewis/Bronsted acid is important for higher selectivity to LA from HMF, as well as from cellulose. Then, after replacing N-2 with H-2, the generated LA in the reaction mixture can be directly converted to gamma-valerolactone through hydrogenation over the Ru/C catalyst without further separation of LA.