Catalytic hydrodeoxygenation is an essential step for bio-oil upgrading. However, hydrodeoxygenation usually requires a high hydrogen pressure and high temperature due to the good stability of the C–O bonds. Here we report an effective multiphase hydrodeoxygenation of lignin-based bio-oil at temperatures <100 °C and hydrogen pressures <1 atm using a synergetic catalyst system that consists of a low redox potential H₄SiW₁₂O₄₀ (SiW₁₂) and suspended Pt-on-carbon (Pt/C) particles. We propose that SiW₁₂ plays three critical roles in bio-oil hydrodeoxygenation. First, it quickly oxidizes the H₂ gas to form reduced SiW₁₂ in the presence of Pt/C. Second, it transfers both electrons and H⁺ ions to the bulk phase to form active H* or H₂ on the Pt/C surface. Third, the formation of the oxonium ion in a SiW₁₂ superacid solution reduces the deoxygenation energy. The SiW₁₂-enhanced proton-transfer hydrodeoxygenation mechanism is supported by density functional theory computations. As a result of the hydrogen buffer and acidic effect, up to a 90% yield of hydrocarbons (cyclohexane, benzene and their derivatives) was achieved from the hydrodeoxygenation of phenol and its derivatives.

催化加氢脱氧是生物油提质的重要步骤。但是，由于C–O键的良好稳定性，加氢脱氧通常需要较高的氢气压力和高温。在这里，我们报告了使用协同催化系统由木质素基生物油在低于100°C的温度和低于1 atm的氢气压力下进行的有效多相加氢脱氧，该系统由低氧化还原电位H ₄ SiW ₁₂ O ₄₀（SiW ₁₂）组成并悬浮碳载铂（Pt / C）颗粒。我们建议SiW ₁₂在生物油加氢脱氧中发挥三个关键作用。首先，它迅速氧化H ₂气体以形成还原的SiW ₁₂在Pt / C存在下。其次，它将电子和H ⁺离子都转移到本体相中，从而在Pt / C表面形成活性H *或H ₂。第三，在SiW ₁₂超酸溶液中形成氧鎓离子会降低脱氧能。SiW ₁₂增强的质子转移加氢脱氧机理得到密度泛函理论计算的支持。由于氢缓冲作用和酸性作用，苯酚及其衍生物的加氢脱氧反应可实现高达90％的烃（环己烷，苯及其衍生物）收率。