Lignin Solubilization and Aqueous Phase Reforming for the Production of Aromatic Chemicals and Hydrogen
Lignin Solubilization and Aqueous Phase Reforming for the Production of Aromatic Chemicals and Hydrogen
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DOI：
10.1002/cssc.201000299
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发表时间：
2011-01-01
期刊：
影响因子：
8.4
通讯作者：
Weckhuysen, Bert M.
中科院分区：
文献类型：
--
作者：
Zakzeski, Joseph;Weckhuysen, Bert M.
首次报道了在低温（T < 498 K）和低压（P < 29 bar）下木质素（包括硫酸盐木质素、碱木质素和碱木质素沿着甘蔗渣）的溶解和水相重整用于生产芳香族化学品和氢气。木质素模型化合物和在木质素水相重整期间获得的产物的分布的分析揭示，木质素通过破坏丰富的β-O-4键以及在较小程度上破坏5-5'碳-碳键而解聚以形成单体芳族化合物。这些单体化合物上所含的烷基链容易重整以产生氢和简单的芳族平台化学品，特别是愈创木酚和姜子油，其中每种的分布取决于木质素来源。芳环上的甲氧基水解形成甲醇，甲醇也容易重整产生氢气和二氧化碳。根据木质素样品，单体芳族化合物的分离产率和基于这些分离产率的总木质素转化率的组成在10-15%之间变化，余量由气态产物和残余固体材料组成。此外，我们介绍了使用一个高压釜与光学窗口和一个高压釜与ATR-IR哨兵在线原位光谱监测生物质转化过程中，它提供了直接的洞察，例如，溶解过程和水相重整反应的木质素。
The solubilization and aqueous phase reforming of lignin, including kraft, soda, and alcell lignin along with sugarcane bagasse, at low temperatures (T < 498 K) and pressures (P < 29 bar) is reported for the first time for the production of aromatic chemicals and hydrogen. Analysis of lignin model compounds and the distribution of products obtained during the lignin aqueous phase reforming revealed that lignin was depolymerized through disruption of the abundant beta-O-4 linkages and, to a lesser extent, the 5-5' carbon-carbon linkages to form monomeric aromatic compounds. The alkyl chains contained on these monomeric compounds were readily reformed to produce hydrogen and simple aromatic platform chemicals, particularly guaiacol and syringol, with the distribution of each depending on the lignin source. The methoxy groups present on the aromatic rings were subject to hydrolysis to form methanol, which was also readily reformed to produce hydrogen and carbon dioxide. The composition of the isolated yields of monomeric aromatic compounds and overall lignin conversion based on these isolated yields varied from 10-15% depending on the lignin sample, with the balance consisting of gaseous products and residual solid material. Furthermore, we introduce the use of a high-pressure autoclave with optical windows and an autoclave with ATR-IR sentinel for on-line in situ spectroscopic monitoring of biomass conversion processes, which provides direct insight into, for example, the solubilization process and aqueous phase reforming reaction of lignin.