Strong oxide-oxide interactions in silica-supported Fe3O4. III. Water-induced migration of silica on geometrically designed catalysts

Carl R.F. Lund; J. A. Dumesic

doi:10.1016/0021-9517(81)90074-9

Strong oxide-oxide interactions in silica-supported Fe₃O₄. III. Water-induced migration of silica on geometrically designed catalysts

Carl R.F. Lund
, J. A. Dumesic

Department of Chemical and Biological Engineering

University of Wisconsin-Madison

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

65 Scopus citations

Abstract

Geometrically designed catalysts were prepared by evaporating silica onto part of the surface of an oxidized iron foil. These model catalysts allowed scanning Auger electron microscopy to be used to study the mobility of silica in different gas environments at ca. 670 K and atmospheric pressure. For the iron oxide/silica model catalyst, silica migration was observed upon treatment in H₂O CO or H₂O H₂ gas mixtures, while significant migration was not observed upon treatment in CO₂ CO or O₂. In particular, that portion of the iron oxide surface, initially free of Si, became covered by Si after treatment in H₂O CO or H₂O H₂, while it remained essentially free of Si after treatment in CO₂ CO or O₂. Preliminary investigation of a similarly prepared Pt SiO₂ catalyst indicated that the phenomenon of SiO₂ mobility at ca. 660 K and atmospheric pressure may be of importance for other silica-supported catalyst systems.

Original language	English
Pages (from-to)	21-30
Number of pages	10
Journal	Journal of Catalysis
Volume	72
Issue number	1
DOIs	https://doi.org/10.1016/0021-9517(81)90074-9
State	Published - Nov 1981

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title = "Strong oxide-oxide interactions in silica-supported Fe3O4. III. Water-induced migration of silica on geometrically designed catalysts",

abstract = "Geometrically designed catalysts were prepared by evaporating silica onto part of the surface of an oxidized iron foil. These model catalysts allowed scanning Auger electron microscopy to be used to study the mobility of silica in different gas environments at ca. 670 K and atmospheric pressure. For the iron oxide/silica model catalyst, silica migration was observed upon treatment in H2O CO or H2O H2 gas mixtures, while significant migration was not observed upon treatment in CO2 CO or O2. In particular, that portion of the iron oxide surface, initially free of Si, became covered by Si after treatment in H2O CO or H2O H2, while it remained essentially free of Si after treatment in CO2 CO or O2. Preliminary investigation of a similarly prepared Pt SiO2 catalyst indicated that the phenomenon of SiO2 mobility at ca. 660 K and atmospheric pressure may be of importance for other silica-supported catalyst systems.",

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N2 - Geometrically designed catalysts were prepared by evaporating silica onto part of the surface of an oxidized iron foil. These model catalysts allowed scanning Auger electron microscopy to be used to study the mobility of silica in different gas environments at ca. 670 K and atmospheric pressure. For the iron oxide/silica model catalyst, silica migration was observed upon treatment in H2O CO or H2O H2 gas mixtures, while significant migration was not observed upon treatment in CO2 CO or O2. In particular, that portion of the iron oxide surface, initially free of Si, became covered by Si after treatment in H2O CO or H2O H2, while it remained essentially free of Si after treatment in CO2 CO or O2. Preliminary investigation of a similarly prepared Pt SiO2 catalyst indicated that the phenomenon of SiO2 mobility at ca. 660 K and atmospheric pressure may be of importance for other silica-supported catalyst systems.

AB - Geometrically designed catalysts were prepared by evaporating silica onto part of the surface of an oxidized iron foil. These model catalysts allowed scanning Auger electron microscopy to be used to study the mobility of silica in different gas environments at ca. 670 K and atmospheric pressure. For the iron oxide/silica model catalyst, silica migration was observed upon treatment in H2O CO or H2O H2 gas mixtures, while significant migration was not observed upon treatment in CO2 CO or O2. In particular, that portion of the iron oxide surface, initially free of Si, became covered by Si after treatment in H2O CO or H2O H2, while it remained essentially free of Si after treatment in CO2 CO or O2. Preliminary investigation of a similarly prepared Pt SiO2 catalyst indicated that the phenomenon of SiO2 mobility at ca. 660 K and atmospheric pressure may be of importance for other silica-supported catalyst systems.

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Strong oxide-oxide interactions in silica-supported Fe₃O₄. III. Water-induced migration of silica on geometrically designed catalysts

Abstract

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