Morphologies of Sn and PtSn phases on thin films of alumina and graphite

Transmission electron microscopy studies of Sn and Pt-Sn morphologies were conducted on model catalysts, prepared by the vacuum evaporation of metal onto thin films of γ-alumina and sheets of graphite. All supported Sn samples showed nonwetting metallic particles following treatment in hydrogen. Sma...

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Published in:Journal of catalysis 1990-07, Vol.124 (1), p.160-182
Main Authors: Handy, B.E., Dumesic, J.A., Sherwood, R.D., Baker, R.T.K.
Format: Article
Language:English
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Chemistry
Exact sciences and technology
General and physical chemistry
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
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Dumesic, J.A.
Sherwood, R.D.
Baker, R.T.K.
description Transmission electron microscopy studies of Sn and Pt-Sn morphologies were conducted on model catalysts, prepared by the vacuum evaporation of metal onto thin films of γ-alumina and sheets of graphite. All supported Sn samples showed nonwetting metallic particles following treatment in hydrogen. Small (
doi_str_mv 10.1016/0021-9517(90)90112-W
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All supported Sn samples showed nonwetting metallic particles following treatment in hydrogen. Small (&lt;20 nm) particles assumed a core/shell morphology on alumina, due to the existence of a thin oxidic tin-support phase surrounding or beneath a metallic core, whereas the metallic particles on graphite showed uniform contrast. Upon oxidation, metallic Sn particles transformed into toroidal-shaped particles, indicative of an interaction between tin oxide and the substrates. Upon addition of Pt to the supported Sn samples, Pt-Sn alloy formation was observed under reducing conditions. On alumina, the particles were round and surrounded by a light apron. Graphite-supported particles were round and featureless. Upon oxidation of all specimens, the alloy phase was destroyed, as the tin was preferentially oxidized to SnO 2 while the platinum remained metallic, forming a characteristic core/shell appearance. The presence of tin retarded the catalytic oxidation of the graphite substrate by platinum at 770 K. A fraction of the surface tin oxide layer formed during the oxidation treatment of Pt-Sn/Al 2O 3 did not re-alloy with the platinum upon reduction, due to interaction with the alumina support.</description><identifier>ISSN: 0021-9517</identifier><identifier>EISSN: 1090-2694</identifier><identifier>DOI: 10.1016/0021-9517(90)90112-W</identifier><identifier>CODEN: JCTLA5</identifier><language>eng</language><publisher>Amsterdam: Elsevier Inc</publisher><subject>Chemistry ; Exact sciences and technology ; General and physical chemistry ; Theory of reactions, general kinetics. Catalysis. 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All supported Sn samples showed nonwetting metallic particles following treatment in hydrogen. Small (&lt;20 nm) particles assumed a core/shell morphology on alumina, due to the existence of a thin oxidic tin-support phase surrounding or beneath a metallic core, whereas the metallic particles on graphite showed uniform contrast. Upon oxidation, metallic Sn particles transformed into toroidal-shaped particles, indicative of an interaction between tin oxide and the substrates. Upon addition of Pt to the supported Sn samples, Pt-Sn alloy formation was observed under reducing conditions. On alumina, the particles were round and surrounded by a light apron. Graphite-supported particles were round and featureless. Upon oxidation of all specimens, the alloy phase was destroyed, as the tin was preferentially oxidized to SnO 2 while the platinum remained metallic, forming a characteristic core/shell appearance. The presence of tin retarded the catalytic oxidation of the graphite substrate by platinum at 770 K. A fraction of the surface tin oxide layer formed during the oxidation treatment of Pt-Sn/Al 2O 3 did not re-alloy with the platinum upon reduction, due to interaction with the alumina support.</description><subject>Chemistry</subject><subject>Exact sciences and technology</subject><subject>General and physical chemistry</subject><subject>Theory of reactions, general kinetics. Catalysis. 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All supported Sn samples showed nonwetting metallic particles following treatment in hydrogen. Small (&lt;20 nm) particles assumed a core/shell morphology on alumina, due to the existence of a thin oxidic tin-support phase surrounding or beneath a metallic core, whereas the metallic particles on graphite showed uniform contrast. Upon oxidation, metallic Sn particles transformed into toroidal-shaped particles, indicative of an interaction between tin oxide and the substrates. Upon addition of Pt to the supported Sn samples, Pt-Sn alloy formation was observed under reducing conditions. On alumina, the particles were round and surrounded by a light apron. Graphite-supported particles were round and featureless. Upon oxidation of all specimens, the alloy phase was destroyed, as the tin was preferentially oxidized to SnO 2 while the platinum remained metallic, forming a characteristic core/shell appearance. 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subjects Chemistry
Exact sciences and technology
General and physical chemistry
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
title Morphologies of Sn and PtSn phases on thin films of alumina and graphite
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