Enhancing selective hydrogenation of pyridine: The role of nickel doping in Pt/γ-Al2O3 catalysts

作者：Zhen Xu, Wenbin Huang, Tianyu Bai, Jiling Guo, Meng Huang, Yang Han, Fan Shao, Rongrong Li, Yasong Zhou, Qiang Wei · 发表于：Chemical Engineering Science · 年份：2025 · DOI：10.1016/j.ces.2025.121751 · 被引用次数：3 · 研究领域：Catalysis and Hydrodesulfurization Studies、Catalytic Processes in Materials Science、Nanomaterials for catalytic reactions

Highly dispersed PtNi bimetallic sites were constructed on γ-Al 2 O 3 through a nickel doping strategy for selective pyridine hydrogenation. Optimal Ni doping promoted active site exposure, optimized reactant diffusion pathways, and influenced pyridine adsorption via electronic microenvironment modulation. The Pt-Ni electronic synergy was maintained while suppressing C–N bond hydrogenolysis through surface adsorption barrier control. Density functional theory (DFT) calculations confirmed reduced piperidine desorption energy barriers due to Ni doping. Under continuous flow conditions (453 K, 3.5 MPa, H 2 /oil 500:1, LHSV 3 h −1 ), Pt 3 Ni 1 /Al 2 O 3 achieved 87.9 % pyridine conversion and 96 % piperidine selectivity. The enhanced performance originated from highly dispersed bimetallic sites, optimized acid distribution, and electronic synergy, providing a new idea for the selective hydrogenation of heterocyclic compounds.