WOx effect on the catalytic properties of Pt particles on Al2O3

J. L. Contreras; G. A. Fuentes; L. A. García; J. Salmones; B. Zeifert

doi:10.1016/j.jallcom.2008.08.143

WOx effect on the catalytic properties of Pt particles on Al₂O₃

J. L. Contreras, G. A. Fuentes, L. A. García, J. Salmones, B. Zeifert

Centro Interdisciplinario de Investigaciones y Estudios sobre Medio Ambiente y Desarrollo (CIIEMAD)
Escuela Superior de Ingeniería Química e Industrias Extractivas (ESIQIE)

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

Abstract

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).

Original language	English
Pages (from-to)	450-452
Number of pages	3
Journal	Journal of Alloys and Compounds
Volume	483
Issue number	1-2
DOIs	https://doi.org/10.1016/j.jallcom.2008.08.143
State	Published - 26 Aug 2009

Keywords

Nanostructures
Scanning and transmission electron microscopy
Sol-gel synthesis
Surfaces and interfaces

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10.1016/j.jallcom.2008.08.143

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title = "WOx effect on the catalytic properties of Pt particles on Al2O3",

abstract = "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).",

keywords = "Nanostructures, Scanning and transmission electron microscopy, Sol-gel synthesis, Surfaces and interfaces",

author = "Contreras, {J. L.} and Fuentes, {G. A.} and Garc{\'i}a, {L. A.} and J. Salmones and B. Zeifert",

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T1 - WOx effect on the catalytic properties of Pt particles on Al2O3

AU - Contreras, J. L.

AU - Fuentes, G. A.

AU - García, L. A.

AU - Salmones, J.

AU - Zeifert, B.

PY - 2009/8/26

Y1 - 2009/8/26

N2 - 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).

AB - 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).

KW - Nanostructures

KW - Scanning and transmission electron microscopy

KW - Sol-gel synthesis

KW - Surfaces and interfaces

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DO - 10.1016/j.jallcom.2008.08.143

M3 - Artículo

SN - 0925-8388

VL - 483

SP - 450

EP - 452

JO - Journal of Alloys and Compounds

JF - Journal of Alloys and Compounds

IS - 1-2

ER -

WOx effect on the catalytic properties of Pt particles on Al₂O₃

Abstract

Keywords

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