Ni基催化剂的分散度对其加氢脱氧性能有显著的影响，提高金属Ni的分散度有利于更多的金属Ni活性位暴露于催化剂表面，从而促进催化剂对H₂分子和反应物分子的吸附和活化，使催化剂展现出更优异的油脂加氢脱氧性能。课题组近期将柠檬酸作为助剂引入Ni/Al₂O₃催化剂中，柠檬酸助剂的引入能有效提升前驱体的可还原性能，制得具有高分散度的Ni催化剂，能削弱金属Ni与γ-Al₂O₃载体间的相互作用，从而影响催化剂活化氢分子的能力，且活性氢物种供应能力随柠檬酸用量增加呈火山型变化趋势。2CA-6wt%NiAl催化剂具有较高的月桂酸甲酯转化率，在反应温度为400℃、反应压力为2.0 MPa、H₂/油为500 N和LHSV为1.5 h^-1时，月桂酸甲酯转化率为82.87%，烷烃选择性达71.0%，其中主要产物C₁₁烷烃的选择性达60.02%。

Shuang Chen (陈爽), Jia Zeng, Zhengjiang Liao, Hongmei Xie, Guilin Zhou*. Controllable preparation of highly dispersed Ni/γ-Al₂O₃ catalyst for lipids hydrodeoxygenation to biofuel [J]. Journal of Environmental Chemical Engineering, 2025, 13(5): 117518. https://doi.org/10.1016/j.jece.2025.117518.

Lipids, which derived from waste cooking oil and produced in large quantities, have a naturally intact long carbon chain structure and can be hydrodeoxygenated to prepare second-generation biodiesel. In order to further improve the hydrodeoxygenation (HDO) performances of the Ni-based catalysts, citric acid additive is used to form chelates with Ni²⁺, thereby weakening the strong interaction between metal Ni and the Al₂O₃support, forming small Ni nanoparticlesand improving the dispersion of metal Ni.Characterization and DFT calculations indicate that the interfacial structure formed by Ni and Al₂O₃ is critical for lipid HDO, and that metallic Ni enables lipid activation and hydrogenation of key intermediates through efficient H₂ dissociation. The effects of metal Ni dispersion, metal-support interactions, and metal Ni content on the lipids HDO performances of the Ni/γ-Al₂O₃ catalysts are investigated in detail. The lipids HDO performances are greatly improved by balancing the metal Ni content and dispersion. The 2CA-6wt% NiAl catalyst has the highest methyl laurate conversion (82.87%) and alkane selectivity (77.0%), including the main C₁₁ alkane product with a selectivity of 60.02%. This work provides a new design method fordeveloping highly efficient lipids HDO catalysts by controlling dispersion.