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HERO ID
7958653
Reference Type
Journal Article
Title
Carbon-supported PtSn catalysts: Characterization and catalytic properties
Author(s)
Roman-Martinez, MC; Cazorla-Amoros, D; de Miguel, S; Scelza, O
Year
2004
Is Peer Reviewed?
Yes
Journal
Journal of the Japan Petroleum Institute
ISSN:
1346-8804
EISSN:
1349-273X
Volume
47
Issue
3
Page Numbers
164-178
Language
English
DOI
10.1627/jpi.47.164
Web of Science Id
WOS:000222117000002
Abstract
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.
Keywords
platinum tin catalyst; carbon support; carvone hydrogenation; XAFS; TPR
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