In this study, Ni–Sn metal oxide catalysts, with strong Lewis acidity, were prepared and applied in lignin depolymerization to produce liquefied fuels. The Ni–Sn metal oxide catalysts could cleave the lignin linkages and stabilize the reaction intermediates due to the high Lewis acidity and the hydrogenation of nickel sites. When the molar ratio of nickel to tin was 1 : 3, a liquid product yield of 90% and a petroleum ether soluble product (mainly monomers and dimer degradation products) yield of 60% were obtained at 310 °C for 24 h. Under these reaction conditions, the petroleum ether soluble product had a higher heating value (HHV) (36.45 MJ kg⁻¹) than Kraft lignin (25.83 MJ kg⁻¹). A meticulous study on Ni–Sn metal oxide catalysts revealed that Lewis acidity and the synergistic effect between Ni and Sn played an important role in lignin depolymerization.

中文翻译：

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Ni-Sn金属氧化物催化剂对牛皮纸木质素进行催化解聚以生产液体燃料

在这项研究中，制备了具有强路易斯酸性的Ni-Sn金属氧化物催化剂，并将其用于木质素解聚以生产液化燃料。由于高路易斯酸度和镍位点的氢化作用，Ni-Sn金属氧化物催化剂可以裂解木质素键并稳定反应中间体。当镍与锡的摩尔比为1：3时，在310℃下24小时获得60％的液体产物产率和60％的石油醚可溶性产物（主要是单体和二聚体降解产物）产率。在这些反应条件下，石油醚可溶性产物的热值（HHV）（36.45 MJ kg ^-1）比牛皮纸木质素（25.83 MJ kg ^-1）高）。对Ni-Sn金属氧化物催化剂的细致研究表明，路易斯酸度以及Ni和Sn之间的协同作用在木质素解聚中起重要作用。