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7958653 
Journal Article 
Carbon-supported PtSn catalysts: Characterization and catalytic properties 
Roman-Martinez, MC; Cazorla-Amoros, D; de Miguel, S; Scelza, O 
2004 
Yes 
Journal of the Japan Petroleum Institute
ISSN: 1346-8804
EISSN: 1349-273X 
47 
3 
164-178 
English 
WOS:000222117000002 
Carbon-supported PtSn catalysts were prepared by impregnation using a commercial activated carbon after purification and oxidation (H2O2 20 vol %) treatments. The support surface chemistry of the carbon after purification and the oxidized carbon, and successive impregnation or coimpregnation procedures were examined. H2PtCl6 was partially reduced after the impregnation and drying steps. After impregnation and drying, Pt and Sn must be in close proximity. After reduction, bimetallic catalysts consisted of metallic Pt, a major fraction of tin as Sn(II) and/or Sn(IV) species, and also Sn in the zero valent state, which was probably present as alloys with zero valent Pt. Sn surface enrichment was observed. The effect of the surface oxidation on the catalytic activity for cyclohexane dehydrogenation was related to the accessibility of the Pt particles, which were more externally located on the oxidized support. The effect of tin on the selectivity for alcohols was related to blockage of the Pt particles, which reduced the hydrogenation rate of the C=C bond. 
platinum tin catalyst; carbon support; carvone hydrogenation; XAFS; TPR