课题组近期采用金属氧化物（ZrO₂、CeO₂、La₂O₃和MgO）修饰γ-Al₂O₃，通过浸渍法制备负载量为10wt%的Ni基催化剂。以月桂酸甲酯为模型化合物，研究载体表面性质对Ni基催化剂油脂加氢脱氧（HDO）性能的影响，并采用H₂-TPD、H₂-TPR、BET、TEM、XRD、CO₂-TPD、NH₃-TPD和Py-IR等表征手段表征所制备的Ni基催化剂。结果表明，所制备的Ni基催化剂均具有大的比表面积（> 130 m²·g^-1）和发达的孔道结构，助剂的引入对Ni物种的还原性有显著影响，并明显提高了所研究的Ni基催化剂对H₂分子的低温“吸附-解吸”性能。经助剂修饰后，催化剂表面酸碱性发生明显改变，金属中心和酸位之间的协同作用，使Ni基催化剂能优先催化月桂酸甲酯发生脱羰/羧基（DCO）反应，产生C₁₁烷烃；金属中心和碱位之间的协同作用，使Ni基催化剂能优先催化月桂酸甲酯选择性加氢反应，生成含氧化合物。经La₂O₃修饰的Ni基催化剂具有高的月桂酸甲酯转化率和含氧产物选择性，在反应温度为400℃、反应压力为2.0 MPa、H₂/油比为500 N和LHSV为1.5 h^-1时，月桂酸甲酯转化率为72.70%，含氧产物选择性达63.82%。

Shuang Chen（陈爽）, Meijun Leng, Zhengjiang Liao, Jia Zeng, Hongmei Xie, Guilin Zhou*. Synergistic effects of surface acidity and alkalinity of Ni/γ-Al₂O₃ catalysts in fats and oils hydrodeoxygenation product distribution [J]. Industrial Crops & Products, 2024, 211, 118227.

The deep utilization of green and renewable chemicals has laid the foundation for sustainable development. Recombining and modifying the long carbon chain structure and oxygen-containing functional groups in fats and oils can prepare important chemical products, such as high-quality second-generation biodiesel and oxygen-containing compounds (fatty alcohols, fatty acids, and esters). To improve the hydrodeoxygenation (HDO) performances of Ni-based catalysts, the effect of surface composition was studied in detail. Acid-base centers of Ni/γ-Al₂O₃ catalysts were finely regulated by adding metal oxides (ZrO₂, CeO₂, La₂O₃, and MgO). It was found that enhancing the basicity of the studied catalyst was conducive to the methyl laurate conversion, but was not conducive to the HDO of oxygen-containing intermediates. In other words, the strong basicity would promote the condensation reaction of oxygen-containing intermediates over Ni-based catalyst. Among the studied catalysts, Ni/La₂O₃/γ-Al₂O₃ catalyst showed the highest methyl laurate conversion (73%) and oxygen-containing product selectivity (64%) at 400 °C, LHSV = 1.5 h^-1, H₂/oil = 500 Nm³/m³, and P_H2 = 2.0 MPa over the Ni/La₂O₃/γ-Al₂O₃ catalyst. The acidity was favorable to improve the conversion of oils and the yield of alkane products, and the basicity was favorable to obtain oxygen-containing compounds over the corresponding catalysts.