Product-induced corrosion of Pt/graphite during catalytic oxidation of sorbose studied by in situ STM and cyclic voltammetry

I. Bakos, T. Mallat, A. Baiker

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Platinum deposited onto high and low surface area graphites are used as model catalysts in studying the irreversible catalyst deactivation observed previously in the aerobic oxidation of L-sorbose to 2-keto-L-gulonic acid. The corrosion of platinum in the neutral aqueous solution was followed in the liquid cell of a scanning tunnelling microscope. Leaching of platinum was well detectable in the time scale of 1-2 h. Depending on the nature of graphite support and the Pt content, a considerable fraction or even all Pt dissolved during sorbose oxidation, as evidenced by cyclic voltammetry. The strikingly high rate of Pt dissolution into the neutral aqueous medium under ambient conditions is attributed to the excellent chelating properties of the polyhydroxy carboxylic acid product.

Original languageEnglish
Pages (from-to)201-207
Number of pages7
JournalCatalysis Letters
Volume43
Issue number1-2
Publication statusPublished - 1997

Fingerprint

Sorbose
Graphite
Catalytic oxidation
Platinum
Cyclic voltammetry
corrosion
platinum
graphite
Corrosion
oxidation
products
catalysts
Oxidation
Catalyst deactivation
leaching
Carboxylic Acids
Chelation
Carboxylic acids
carboxylic acids
deactivation

Keywords

  • Corrosion
  • Cyclic voltammetry
  • Pt/graphite
  • Scanning tunnelling microscopy
  • Sorbose oxidation

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Catalysis

Cite this

Product-induced corrosion of Pt/graphite during catalytic oxidation of sorbose studied by in situ STM and cyclic voltammetry. / Bakos, I.; Mallat, T.; Baiker, A.

In: Catalysis Letters, Vol. 43, No. 1-2, 1997, p. 201-207.

Research output: Contribution to journalArticle

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AB - Platinum deposited onto high and low surface area graphites are used as model catalysts in studying the irreversible catalyst deactivation observed previously in the aerobic oxidation of L-sorbose to 2-keto-L-gulonic acid. The corrosion of platinum in the neutral aqueous solution was followed in the liquid cell of a scanning tunnelling microscope. Leaching of platinum was well detectable in the time scale of 1-2 h. Depending on the nature of graphite support and the Pt content, a considerable fraction or even all Pt dissolved during sorbose oxidation, as evidenced by cyclic voltammetry. The strikingly high rate of Pt dissolution into the neutral aqueous medium under ambient conditions is attributed to the excellent chelating properties of the polyhydroxy carboxylic acid product.

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