Reductive catalytic fractionation of lignocellulose: when should the catalyst meet depolymerized lignin fragments?,Sustainable Energy & Fuels

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Reductive catalytic fractionation of lignocellulose: when should the catalyst meet depolymerized lignin fragments?
Sustainable Energy & Fuels ( IF 5.0 ) Pub Date : 2020-08-28 , DOI: 10.1039/d0se01118e
Shi Qiu _{1,

2,

3,

4,

5} , Meng Wang _{1,

2,

3,

4,

5} , Yunming Fang _{1,

2,

3,

4,

5} , Tianwei Tan _{1,

2,

3,

4,

5}

Affiliation

Reductive catalytic fractionation (RCF) is a promising lignin-first biorefinery strategy that yields a deeply depolymerized lignin and nearly theoretical amounts of lignin monomers with reductive catalysts. Theoretically, the immediate stabilization with a catalyst is a key step in the RCF process, but the experimental support is lacking and few researchers have investigated the timeliness of stabilization. In this study, an on-line catalyst addition device was used to realize the flexible addition of a catalyst at different times in a high-pressure batch reactor. It was found that immediate stabilization is definitely indispensable for high lignin monomer yield, and the timeliness of stabilization mainly depends on the occurrence of repolymerization. Fast repolymerization occured at temperatures from 200 °C to 250 °C and more seriously around 250 °C, suggesting that the RCF process can be realized as long as adding the catalyst occurs before the temperature reaches 200 °C. Further this proves the feasibility of splitting delignification and stabilization/hydrogenation processes, and explains the reason for the reaction temperatures used in effective semi-continuous RCF processes at lower than 200 °C.

中文翻译：

木质纤维素的还原催化分馏：催化剂何时应达到解聚的木质素片段？

还原催化分馏（RCF）是一种有前途的木质素优先生物精炼策略，可通过还原催化剂产生深度解聚的木质素和接近理论量的木质素单体。从理论上讲，用催化剂立即稳定化是RCF过程中的关键步骤，但缺乏实验支持，很少有研究者研究稳定化的及时性。在这项研究中，使用在线催化剂添加设备在高压间歇式反应器中实现了在不同时间灵活添加催化剂。已经发现，立即稳定化对于木质素单体的高产率无疑是必不可少的，并且稳定化的及时性主要取决于再聚合的发生。快速再聚合发生在200°C至250°C的温度下，更严重的是在250°C附近，这表明只要在温度达到200°C之前添加催化剂，就可以实现RCF工艺。此外，这证明了分裂脱木素和稳定/氢化工艺的可行性，并解释了在低于200°C的有效半连续RCF工艺中使用反应温度的原因。

更新日期：2020-09-15

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