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AIr Mössbauer study of Pt-Ir catalysts prepared by impregnantion of silica with HMCl

Hyperfine Interactions, ISSN: 0304-3843, Vol: 57, Issue: 1-4, Page: 2127-2131
1990
  • 10
    Citations
  • 0
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  • 2
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Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    10
    • Citation Indexes
      10
  • Captures
    2

Article Description

The state of iridium on Pt-Ir catalysts prepared by impregnation of amorphous silica with HIrCl and HPtCl was studied byIr Mössbauer spectroscopy after different steps of preparation. The Ir is adsorbed in its trivalent state, presumably as [IrCl]. Calcination in air at 450°C converts this to IrO. The metallic clusters formed by subsequent reduction in H at 200°C show a strong tendency towards segregation of Ir and Pt and re-oxidize partially when exposed to air at ambient temperature. In both respects the behaviour is similar to that of samples prepared by co-exchange from [Ir(NH)Cl]Cl and Pt(NH)Cl. HO. © 1990 J.C. Baltzer A.G. Scientific Publishing Company.

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