Effect of noble metal particle size on the sulfur tolerance of monometallic Pd and Pt catalysts supported on high-silica USY zeolite

被引：47
作者：
Matsui, T
Harada, M
Ichihashi, Y
Bando, KK
Matsubayashi, N
Toba, M
Yoshimura, Y
机构：
[1] Natl Inst Adv Ind Sci & Technol, Energy Technol Res Inst, Tsukuba, Ibaraki 3058565, Japan
[2] Kobe Univ, Fac Engn, Dept Sci & Chem Engn, Nada Ku, Kobe, Hyogo 6578501, Japan
来源：
APPLIED CATALYSIS A-GENERAL | 2005年 / 286卷 / 02期
关键词：
Pd; Pt; noble metal catalyst; USY zeolite; size effect; sulfur tolerance; EXAFS;
D O I：
10.1016/j.apcata.2005.03.024
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 size effect of monometallic Pd and Pt clusters was investigated for the sulfur tolerance of these noble metal catalysts supported on high-silica USY zeolite, using the CO adsorption method and the extended X-ray adsorption fine structure (EXAFS) method. Both Pd and Pt particles show the highest surface sulfur tolerance in the form of < 20 angstrom-diameter particles, although the bulk phase of these clusters is subject to penetration by adsorbed sulfur atoms. For noble metal particles > 25 angstrom in diameter, the bulk phases of the Pd and the Pt particles approach that of the metallic structure. With increased cluster size, the surface sulfur tolerance of Pt particles decreases gradually, while that of Pd particles decreases rapidly. For large noble metal particles > 50 angstrom in diameter, EXAFS spectra show that sulfidation in the bulk phase of the noble metal particles is suppressed for Pt but promoted for Pd. (c) 2005 Elsevier B.V. All rights reserved.
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收藏
页码：249 / 257
页数：9
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