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- Title
Task‐Specific Catalyst Development for Lignin‐First Biorefinery toward Hemicellulose Retention or Feedstock Extension.
- Authors
Qiu, Shi; Guo, Xuan; Huang, Yong; Fang, Yunming; Tan, Tianwei
- Abstract
A catalytic reductive fractionation method for lignocellulosic biomass, termed lignin‐first biorefinery, has emerged, which emphasises preferential depolymerization of the protolignin. However, in most studies, the lignin‐first biorefinery is only effective for hardwood that has a high syringyl/guaiacol (S/G) ratio of lignin building blocks, and the degradation of hemicellulose also takes place simultaneously to a certain degree. In this study, two task‐specific catalysts were developed to realize hemicellulose retention and feedstock extension through the development of an objective performance–structure relationship. It is found that MoxC/carbon nanotube (CNT) is highly selective in the cleavage of bonds between carbohydrates and lignin and ether bonds in lignin during the catalytic reductive fractionation of hardwood, leading to a carbohydrate (both cellulose and hemicellulose) retention degree in the solid product close to the theoretical maximum and a delignification degree as high as 98.1 %. Ru/CMK‐3 is demonstrated to be effective in the catalytic reductive fractionation of softwood and grass, resulting from its weak acidity and high mesoporosity. Lignin first: A flexible lignin‐first biorefinery could be developed by task‐specific catalyst design for hemicellulose retention or feedstock extension. MoxC/carbon nanotube (CNT) is found to be a promising catalyst for the retention of hemicellulose by cleavage of the bonds between lignin and carbohydrates with high selectivity. Ru/CMK‐3 achieves the extension of the feedstock for the lignin‐first biorefinery from hardwood to softwood.
- Subjects
LIGNINS; HEMICELLULOSE; CATALYTIC reduction; LIGNOCELLULOSE; DEPOLYMERIZATION
- Publication
ChemSusChem, 2019, Vol 12, Issue 4, p944
- ISSN
1864-5631
- Publication type
Article
- DOI
10.1002/cssc.201802130