Abstract
Fast Fourier transformation infrared spectroscopy was used to characterize the formation of bimetallic interactions of γ-Al2O3-supported Pd−Pt catalysts. The effects of bimetallic interactions on catalyst performance were examined in long-term stability tests, carried out with a pilot plant under the same operating conditions and feed as those of a commercial diesel hydrotreating process. These tests are the hydrotreating of straight run distillate diesel at 340 °C, 580 psig, and H2/oil (mol) = 2.5 over a 25 day period. The characterization results indicate that Pd precursors and pretreatment conditions affect Pd−Pt bimetallic interactions in the H2-reduced catalysts and the catalyst performance. The Pd−Pt catalysts made from palladium(II) acetate without calcination pretreatment presented a significant Pd−Pt bimetallic interaction, as evidenced by a shift in the infrared absorption peak characteristic of terminal CO ligands adsorbed on the Pt clusters to higher energy, bridging CO on the Pd to lower ener...
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