Enhanced cello-oligosaccharides production from cellulose hydrolysis in molten salt hydrate over lignin-based hyper-cross-linked polymer (LHCP) adsorption

作者：Ma, Qiaozhi^*; Lin, Jianying; Guan, Mingzhao; Liang, Haotong; Liu, Qiyu^*

来源：Applied Catalysis A: General , 2022, 644: 118808.

DOI：10.1016/j.apcata.2022.118808

• Cellulose
• Cello-oligosaccharides
• Molten Salt Hydrate
• Lignin-based Hyper-Cross-Linked Polymer
• Selective Adsorption

Selective hydrolysis of crystalline cellulose to cello-oligosaccharides in molten salt hydrates (MSHs) is a promising method for valorization of lignocellulose. However, the by-products derived from cellulose hydrolysis can facilitate cello-oligosaccharide degradation and decrease its selectivity. To address this issue, lignin-based hyper cross-linked polymers (LHCPs) were prepared to in situ adsorb by-products during hydrolysis and thus prevent cello-oligosaccharides from degradation. The synthesized LHCP-33%, with a high lignin content of 33%, showed a remarkable surface area of 708.7 m(2) g(-1) and good hydrophilicity, exhibiting a promising adsorption capacity of 340 mg g(-1) towards 5-hydroxymethylfurfural (5-HMF), which is supposed to be the major cellulose-derived byproduct. We showed that 5-HMF adsorption was driven by the formation of CH-pi bonds between 5-HMF and aromatic rings on LHCP. When LHCP-33% was employed in cellulose hydrolysis, the yield of cello-oligosaccharide can be efficiently enhanced from 39.5% to 78.2%. This work offered a new application of lignin in enhanced cello-oligosaccharide production from cellulose.

• 单位
  华南农业大学