Supported Pt-Sn catalysts highly selective for isobutane dehydrogenation:: preparation, characterization and catalytic behavior

被引：112
作者：
Llorca, J
Homs, N
León, J
Sales, J
Fierro, JLG
de la Piscina, PR
机构：
[1] Univ Barcelona, Fac Quim, Dept Quim Inorgan, E-08028 Barcelona, Spain
[2] CSIC, Inst Catalisis & Petr Quim, Madrid 28049, Spain
来源：
APPLIED CATALYSIS A-GENERAL | 1999年 / 189卷 / 01期
关键词：
bimetallic catalysts preparation; supported platinum-tin catalysts; dehydrogenation of isobutane; isobutene selective production; alloys on supports;
D O I：
10.1016/S0926-860X(99)00253-7
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：
Magnesia-supported platinum-tin catalysts with a Pt content 0.25-3% and atomic ratio Pt/Sn = 1 were prepared from a Pt-Sn bimetallic complex. Characterization of catalysts by XRD, TEM, EDX, XPS and CO singleton frequency indicated the formation of well-dispersed bimetallic particles, the size of which decreased with the metal content. Both dilution and electronic effects on Pt by Sn were evidenced by IR experiments of CO adsorption. The behavior of catalysts in isobutane dehydrogenation at 753 K and atmospheric pressure was related to their structural characteristics and compared to silica- and alumina-supported catalysts prepared by a similar method, and to the respective monometallic catalysts. Magnesia-supported bimetallic catalysts were the most selective to isobutene production. Selectivities higher than 99 % were achieved for conversion values of 11%. (C) 1999 Elsevier Science B.V. AU rights reserved.
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页码：77 / 86
页数：10
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