Lignocellulose is a widely available carbon source and a promising feedstock for the production of advanced second‐generation biofuels. Nonetheless, lignin, one of its major components, is largely underutilized and only considered an undesired byproduct. Through catalytic hydrotreatment, the highly condensed lignin can be partially depolymerized into a range of monomers. However, its recalcitrance and the presence of aromatic fragments linked by CC bonds require extensive cracking, which is challenging to achieve. Here, a two‐step strategy is reported in which an initial pretreatment step with ozone is used prior to catalytic hydrotreatment to boost lignin depolymerization. Three types of lignin (Kraft, pyrolytic, and Fabiola organosolv) are used as feedstocks and the ozonation step is performed under ambient conditions with either methanol or ethanol as the solvent. The pretreatment is shown to have a positive effect on the subsequent hydrotreatment reaction (Pd/C, 350 °C, 100 bar H₂) and gives product oils with significantly lower M_w (up to 43% lower), higher volatility, and improved calorific values (up to 45.3 MJ kg⁻¹) compared to a direct hydrotreatment.

中文翻译：

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技术木质素向生物燃料转化的两步方法

木质纤维素是广泛使用的碳源，也是生产高级第二代生物燃料的有前途的原料。但是，木质素是其主要成分之一，在很大程度上未被充分利用，仅被认为是不希望的副产物。通过催化加氢处理，高度缩合的木质素可以部分解聚为一系列单体。然而，它的顺应性和芳族片段的存在链接被C C键需要广泛的裂化，这是具有挑战性的。在此，报告了一种两步策略，其中在臭氧加氢处理之前先使用臭氧进行初始预处理，以促进木质素解聚。三种类型的木质素（Kraft，热解和Fabiola Organicsolv）用作原料，臭氧化步骤在环境条件下以甲醇或乙醇为溶剂进行。所述预处理显示出对随后的加氢处理反应（的Pd / C，350°C，100巴H A积极效果₂），并给出产品油与显著降低中号_瓦特（高达43％以下），高挥发性，和改进的与直接加氢处理相比，发热量（高达45.3 MJ kg ^-1）。