Confirmation of sulfur tolerance of bimetallic Pd-Pt supported on highly acidic USY zeolite by EXAFS

被引：64

作者：

Yasuda, H ^{[1
]}

Matsubayashi, N ^{[1
]}

Sato, T ^{[1
]}

Yoshimura, Y ^{[1
]}

机构：

[1] Natl Inst Mat & Chem Res, Ibaraki 3058565, Japan

来源：

CATALYSIS LETTERS | 1998年 / 54卷 / 1-2期

关键词：

EXAFS; sulfided bimetallic catalysts; Pd; Pt; USY zeolites; sulfur tolerance;

D O I：

10.1023/A:1019079906043

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The sulfur tolerance (i.e., degree of sulfidation) of Pd and Pt in sulfided bimetallic Pd-Pt catalysts (Pd:Pt mole ratio of 4:1) supported on USY (ultrastable Y) zeolites (SiO2/Al2O3 = 10.7. 48, and 310) was investigated using an extended X-ray absorption fine structure (EXAFS) method. The sulfidation of the catalysts was done in a 1000 ppm H2S-2% H-2/N-2 stream at 573 K for 0.5 h. In the Fourier transforms of Pd K-edge and Pt L-III-edge EXAFS spectra both of the peaks due to metallic Pd and to metallic Pt for the Pd-Pt/USY (SiO2/Al2O3 = 10.7) catalyst remained most after sulfidation. Further, the results of the Fourier transforms confirmed that the sulfur tolerance of both Pd and Pt decreased with increasing SiO2/Al2O3 ratio, suggesting that Pd and Pt become sulfur-tolerant when Pd-Pt bimetallic particles are supported on highly acidic USY zeolite.

引用

页码：23 / 27

页数：5

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