Morphologies of Sn and PtSn 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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| Veröffentlicht in: | Journal of catalysis 1990-07, Vol.124 (1), p.160-182 |
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| container_title | Journal of catalysis |
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| creator | Handy, B.E. 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 |
| format | Article |
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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
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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. Nomenclature, chemical documentation, computer chemistry</subject><issn>0021-9517</issn><issn>1090-2694</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1990</creationdate><recordtype>article</recordtype><recordid>eNo9kM1KxDAUhYMoOI6-gYtuBF1Ub_6ayUaQwT9UFFRmGdL0dhrptCWpgk_iq_hUPoPtjLg6F87H5fARckjhlALNzgAYTbWk6ljDiQZKWbrYIhMKGlKWabFNJv_ILtmL8Q0GSMrZhNw9tKGr2rpdeoxJWybPTWKbInnqf76-h7urbByLJukr3ySlr1drzNbvK9_YNbsMtqt8j_tkp7R1xIO_nJLXq8uX-U16_3h9O7-4T5Eq6FMOOTLMAVWuhHKZVFoN8xQWgmFWKildoTVIZFwBFSC40zTLuaQzx5EXfEqONn87G52ty2Ab56Ppgl_Z8Gmo5jMhFBu48w2Hw5gPj8FE57FxWPiArjdF6w0FMyo0ox8z-jEazFqhWfBfWupkMA</recordid><startdate>19900701</startdate><enddate>19900701</enddate><creator>Handy, B.E.</creator><creator>Dumesic, J.A.</creator><creator>Sherwood, R.D.</creator><creator>Baker, R.T.K.</creator><general>Elsevier Inc</general><general>Elsevier</general><scope>IQODW</scope></search><sort><creationdate>19900701</creationdate><title>Morphologies of Sn and PtSn phases on thin films of alumina and graphite</title><author>Handy, B.E. ; Dumesic, J.A. ; Sherwood, R.D. ; Baker, R.T.K.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-e170t-30be2eb0e7b747c657970027ed42e6f755cd9905e237014043c916b3518c3e3d3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1990</creationdate><topic>Chemistry</topic><topic>Exact sciences and technology</topic><topic>General and physical chemistry</topic><topic>Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Handy, B.E.</creatorcontrib><creatorcontrib>Dumesic, J.A.</creatorcontrib><creatorcontrib>Sherwood, R.D.</creatorcontrib><creatorcontrib>Baker, R.T.K.</creatorcontrib><collection>Pascal-Francis</collection><jtitle>Journal of catalysis</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Handy, B.E.</au><au>Dumesic, J.A.</au><au>Sherwood, R.D.</au><au>Baker, R.T.K.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Morphologies of Sn and PtSn phases on thin films of alumina and graphite</atitle><jtitle>Journal of catalysis</jtitle><date>1990-07-01</date><risdate>1990</risdate><volume>124</volume><issue>1</issue><spage>160</spage><epage>182</epage><pages>160-182</pages><issn>0021-9517</issn><eissn>1090-2694</eissn><coden>JCTLA5</coden><abstract>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 (<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.</abstract><cop>Amsterdam</cop><pub>Elsevier Inc</pub><doi>10.1016/0021-9517(90)90112-W</doi><tpages>23</tpages></addata></record> |
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| source | Elsevier ScienceDirect Journals |
| 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 PtSn phases on thin films of alumina and graphite |
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