WOx effect on the catalytic properties of Pt particles on Al2O3

被引：9

作者：

Contreras, J. L. ^{[1
,2
]}

Fuentes, G. A. ^{[2
]}

Garcia, L. A. ^{[3
]}

Salmones, J.

Zeifert, B.

机构：

[1] Univ Autonoma Metropolitana Azcapotzalco, Mexico City 02200, DF, Mexico

[2] Univ Autonoma Metropolitana Iztapalapa, Dpto IPH, Mexico City 09340, DF, Mexico

[3] Inst Politecn Nacl, ESIT, UPALM Zacatenco, Mexico City 07738, DF, Mexico

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2009年 / 483卷 / 1-2期

关键词：

Surfaces and interfaces; Sol-gel synthesis; Scanning and transmission electron microscopy; Nanostructures; ALUMINA CATALYSTS; GAMMA-ALUMINA; TUNGSTEN; ION;

D O I：

10.1016/j.jallcom.2008.08.143

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 effect of WOx on the microstructure, Lewis acidity and catalytic conversion of Pt/Al2O3 catalysts was studied. High surface areas were obtained at low W concentration and the WOx species decreased the Al2O3 surface area and Lewis acid sites. WOx species in tetrahedral coordination were found. Multiple layers of close-packed spheres forming pores were seen on the Al2O3. The addition of WOx produced semi-cubic particles and the spheres disappeared. At low W concentrations (0.5-2 wt%W) dehydrociclization and isomerization selectivities were higher than the hydrocracking selectivity. On the contrary high hydrocracking selectivity was found for samples with high W concentration (4-22 wt%W). (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：450 / 452

页数：3

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