亚临界水中木屑水解过程中纤维素与木质素之间的相互作用,ACS Sustainable Chemistry & Engineering

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亚临界水中木屑水解过程中纤维素与木质素之间的相互作用
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2019-05-22 00:00:00 , DOI: 10.1021/acssuschemeng.9b01127
Wei Yang ₁ , Munan Fang ₁ , Hao Xu ₂ , Hui Wang ₁ , Shengji Wu ₁ , Jie Zhou ₁ , Shouxin Zhu ₂

Affiliation

为了阐明全纤维素和木质素之间的相互作用，本研究研究了亚临界水中锯末，全纤维素，木质素和全纤维素-木质素混合物（HLM）的水解行为，其中HLM用作锯末的模型，全纤维素之间没有共价键和木质素。在较低的反应温度下，木屑中的全纤维素对木质素的影响可忽略不计，而在较高的反应温度下，它可能会促进木质素的水解。相比之下，木质素中木屑中全纤维素的水解被木质素抑制，因为它们之间的共价键具有很高的键解离能。由于此温度范围内的高活化能，共价键的破坏主要发生在273–315°C的反应温度下。然而，在192–273°C的反应温度下它们几乎无法被破坏。木质素抑制全纤维素的开环断裂和糖苷键裂解，导致总碳水化合物和呋喃衍生物的产率低于HLM。另外，它还抑制了全纤维素水解产物分解为左葡萄糖苷和芳族连接的焦炭。以上结果可为开发用于预测生物质水解过程中产物分布的模型提供基础。

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Interactions between Holocellulose and Lignin during Hydrolysis of Sawdust in Subcritical Water

To clarify the interactions between holocellulose and lignin, the hydrolysis behaviors of sawdust, holocellulose, lignin, and holocellulose–lignin mixture (HLM) in subcritical water were investigated in the present study, where HLM acted as a model of sawdust without covalent linkages between holocellulose and lignin. Holocellulose in sawdust showed negligible effects on lignin at low reaction temperatures, whereas it might promote the hydrolysis of lignin at higher reaction temperatures. In contrast, the hydrolysis of holocellulose in sawdust was inhibited by lignin due to the high bond dissociation energies of covalent linkages between them. The destruction of covalent linkages mainly occurred at the reaction temperatures of 273–315 °C, due to the high activation energy at this temperature range. However, they could barely be destroyed at the reaction temperatures of 192–273 °C. The lignin inhibited the ring scission and glycosidic bond cleavage of holocellulose, resulting in lower yields of total carbohydrates and furan derivates than those of HLM. In addition, it also suppressed the decomposition of holocellulose hydrolysate to levoglucosenone and aromatic-linked chars. The above results could provide the basis for developing models for predicting product distribution during the hydrolysis of biomass.

更新日期：2019-05-22

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