Task‐Specific Catalyst Development for Lignin‐First Biorefinery toward Hemicellulose Retention or Feedstock Extension,ChemSusChem

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Task‐Specific Catalyst Development for Lignin‐First Biorefinery toward Hemicellulose Retention or Feedstock Extension
ChemSusChem ( IF 7.5 ) Pub Date : 2019-01-02 , DOI: 10.1002/cssc.201802130
Shi Qiu ₁ , Xuan Guo ₁ , Yong Huang ₁ , Yunming Fang ₁ , Tianwei Tan ₁

Affiliation

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 Mo_xC/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.

中文翻译：

木质素优先生物炼制厂针对半纤维素保留或原料扩展的任务特定催化剂开发

已经出现了一种称为木质素优先生物精炼厂的木质纤维素生物质的催化还原分馏方法，该方法强调了原木质素的优先解聚。但是，在大多数研究中，首先使用木质素的生物精炼厂仅对木质素组成部分具有较高的丁香基/愈创木酚（S / G）比率的硬木有效，并且半纤维素的降解也会同时发生。在这项研究中，开发了两种特定任务的催化剂，以通过建立客观的性能-结构关系来实现半纤维素的保留和原料的扩展。发现Mo _xC /碳纳米管（CNT）在硬木的催化还原分馏过程中对碳水化合物与木质素之间的键的裂解和木质素中的醚键的裂解具有高度选择性，从而导致固体产品中的碳水化合物（纤维素和半纤维素）保留度接近理论最大值和脱木素率高达98.1％。由于Ru / CMK-3弱酸度和高介孔率，因此可有效地对软木和草进行催化还原分馏。

更新日期：2019-01-02

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