Abstract: Pd/Al₂O₃, Pt/Al₂O₃, and Pd-Pt/Al₂O₃ catalysts were prepared using macroporous alumina as the support, and their performance in hydrodeolefination of reformate oil was evaluated. The catalysts were characterized using scanning transmission electron microscopy, electron probe microanalysis, and X-ray photoelectron spectroscopy. The results indicated that the Pd-Pt/Al₂O₃ catalyst exhibited higher olefin removal activity compared to the Pd/Al₂O₃ and Pt/Al₂O₃ catalysts. The S7 catalyst, with n(Pt)/n(Pd) ratio of 0.218, achieved an olefin removal rate of 99.4% and an aromatic loss rate of 0.1%. On the S7 catalyst, Pt and Pd primarily existed as atomic clusters with an average size of 1.6 nm, and both Pt and Pd were uniformly distributed from the center to the edge of the cross-section. Electron transfer from Pd species to Pt species occurred in the catalyst, indicating strong interactions between the Pd and Pt active components.

Key words: reformate, hydrotreating, deolefination, operating conditions