Aromatics reduction over supported platinum catalysts .3. Effects of catalyst precursors and pretreatment conditions on the performance of palladium-promoted platinum catalysts

被引:36
作者
Jan, CA
Lin, TB
Chang, JR
机构
[1] NATL CHUNG CHENG UNIV,DEPT CHEM ENGN,CHIAYI,TAIWAN
[2] CHINESE PETR CORP,RMRC,CHIAYI,TAIWAN
关键词
D O I
10.1021/ie960134e
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
Fast Fourier transformation infrared spectroscopy was used to characterize the formation of bimetallic interactions of gamma-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 degrees C, 580 psig, and H-2/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 H-2-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 energy, and a catalytic reduction of palladium(II) acetate by Pt. In contrast, no significant bimetallic interactions were observed for both catalysts made from palladium(II) acetate with a calcination at 450 degrees C in air and from palladium amine. The long-term stability tests further indicate that the Pd-Pt catalysts with bimetallic interactions have a relatively high selectivity for aromatics reduction and hydrodenitrogenation (HDN), whereas they have a relatively low selectivity for hydrodesulfurization (HDS).
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页码:3893 / 3898
页数:6
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