文献类型：期刊文献

英文题名：A bifunctional carbon catalyst with -Cl and -SO3H groups for hydrolyzing furfural residue to levulinic acid

作者：Zhang, Shuaibin[1];Yan, Bochao[1];Chen, Zhihui[1];Zhang, Suping[1]

机构：[1]East China Univ Sci & Technol, Res Ctr Biomass Energy, Sch Resources & Environm Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China

年份：2022

卷号：97

期号：10

起止页码：2805

外文期刊名：JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY

收录：;EI(收录号：20222712305313);WOS:【SCI-EXPANDED(收录号:WOS:000818829300001)】；

基金：This study was financially supported by the National Key R&D Program of China (2018YFB1501601).

语种：英文

外文关键词：levulinic acid; carbon-based solid acid; grafting; magnetic; furfural residue

摘要：BACKGROUND Levulinic acid, an important platform compound, is extensively used in textiles, dyes, antifreeze, animal feed, solvents and food additives. However, the use of lignocellulosic biomass to produce levulinic acid is difficult because of poor accessibility to cellulose and low hydrolytic yield. Thus a viable hydrolysis strategy and a suitable catalyst must be developed. RESULTS In this study, a bifunctional solid acid catalyst (HTC-SO3H) containing both cellulose binding sites (-Cl, -COOH and -OH) and catalytic sites (-SO3H) was prepared by a carbonization-grafting-oxidization method. X-ray photoelectron spectroscopy and Fourier transform infrared characterization confirmed the existence of -Cl and the successful modification of the -SO3H grafted hydrothermal carbon. The hydrogen bonds formed between cellulose and the binding sites (-Cl, -OH and -COOH) in the catalyst showed synergistic effects with the catalytic sites (-SO3H), leading to efficient hydrolysis of the furfural residue. A total of 74.81% (non-magnetic) and 70.18% (magnetic) levulinic acid yields were obtained after hydrolysis at 190 degrees C and 180 min in gamma-valerolactone-H2O (1:1, v/v). Magnetic catalysts were synthesized using a co-precipitation method. Catalysts were recycled without any obvious reduction in catalytic activity. CONCLUSION Using sucralose as a raw material, the as-synthesized bifunctional solid acid catalyst improved the accessibility to cellulose and increased levulinic acid yield. Moreover, the grafted SO3H formed by hydroxyl hydration condensation exhibited superior stability. This study provides a valuable strategy for the efficient hydrolysis of lignocellulosic biomass. (c) 2022 Society of Chemical Industry (SCI).