Abstract Hydrothermal liquefaction (HTL) is an effective way of converting biomass into fuels and chemicals. Recently, the addition of catalysts in the HTL has been investigated to improve the yield and quality of bio-oil. We previously reported that metallic-Fe-promoted HTL of lignocellulosic biomass affords a water-soluble (WS) fraction that furnishes light olefins and aromatic hydrocarbons upon catalytic cracking over a solid acid catalyst. We demonstrated that the Fe-assisted HTL of cellulose in the presence of a hydrogenation catalyst results in a superior yield and quality of the WS fraction, thereby enhancing the hydrocarbon yield in the catalytic cracking of the WS fraction. When the HTL of cellulose was performed in the presence of Fe and Pd/Al2O3 at 250 °C for 1 h, the WS fraction yield reached 73%. The addition of hydrogenation catalysts led to higher hydrogen-to-effective-carbon ratios (up to 1.33) and proportions of the volatile light WS fraction (up to 63%) than those obtained by Fe-assisted HTL. This improved performance was attributed to the synergistic acceleration by metallic Fe and the hydrogenation catalyst, which particularly hydrogenates ketones to alcohols. Finally, a plausible mechanism that explains the effect of the hydrogenation catalyst was proposed.

中文翻译：

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Fe辅助纤维素水热液化：加氢催化剂对水溶性组分性质的影响

摘要 水热液化（HTL）是一种将生物质转化为燃料和化学品的有效方式。最近，已研究在 HTL 中添加催化剂以提高生物油的产量和质量。我们之前报道过金属铁促进的木质纤维素生物质的 HTL 提供水溶性 (WS) 馏分，在固体酸催化剂上催化裂化后提供轻质烯烃和芳烃。我们证明了在加氢催化剂存在下纤维素的 Fe 辅助 HTL 导致 WS 馏分的优异产率和质量，从而提高了 WS 馏分催化裂化中的烃产率。当纤维素的 HTL 在 Fe 和 Pd/Al2O3 存在下在 250°C 下进行 1 小时时，WS 馏分的产率达到 73%。与通过铁辅助 HTL 获得的相比，加氢催化剂的添加导致更高的氢与有效碳比（高达 1.33）和挥发性轻 WS 馏分的比例（高达 63%）。这种改进的性能归因于金属 Fe 和氢化催化剂的协同加速，特别是将酮氢化成醇。最后，提出了解释加氢催化剂作用的合理机制。