Hydrogenation is one of useful processes in the high valorization of biomass and the non-precious nickel based catalyst is one of promising catalysts owing to its high activity and low cost. Herein, we present a systematic investigation on the preparation, characterization and catalytic property of Ni/Nb₂O₅-SiO₂(x) catalysts in hydrogenation of palmitic acid as a probe reaction. Ni/Nb₂O₅-SiO₂(x) of varying Nb compositions (x = 5, 10 and 20, weight percent of Nb₂O₅) are employed to understand any possible support effect. Kinetic assessments of hydrogenation reaction are conducted to gain information on the catalytic mechanism and synergy effect between Ni and NbO_x in Ni/Nb₂O₅-SiO₂(x) catalysts. Kinetic study shows a higher proportion of NbO_x could lower the activation energy apparently and pre-exponential factor as well. The overall reaction rate step is the Langmuir-Hinshelwood surface reaction between independently adsorbed palmitic acid and H atoms.

氢化是生物质高价值化中的有用方法之一，非贵金属镍基催化剂由于其高活性和低成本而成为有前途的催化剂之一。本文中，我们对Ni / Nb ₂ O ₅ -SiO ₂（x）催化剂在棕榈酸加氢中的制备，表征和催化性能进行系统研究，以探针反应为研究对象。不同Nb组成的Ni / Nb ₂ O ₅ -SiO ₂（x）（x = 5、10和20，Nb ₂ O _5的重量百分比）以了解任何可能的支持效果。进行了氢化反应的动力学评估，以了解Ni / Nb ₂ O ₅ -SiO ₂（x）催化剂中Ni与NbO _x之间的催化机理和协同效应。动力学研究表明，较高比例的NbO _x可以明显降低活化能，也可以降低指数前因子。总体反应速率步骤是独立吸附的棕榈酸和H原子之间的Langmuir-Hinshelwood表面反应。