Effect of K on the deactivation of model Pt black catalysts: Electron spectroscopy and hexane test reaction

A. Wootsch, Ute Wild, Robert Schlögl, Z. Paál

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Pt black prepared by reduction with HCHO/KOH contains ca. 2% K impurity (Pt/K). It can be removed by washing it with HNO3 (Pt). Transformation of hexane/H2 was studied on these two samples after regeneration (O2/H2) and after exposure to trans-trans-hexa-2,4-diene at 603 K. XPS showed ~47% C after this treatment on both samples, but with different carbon structure: more "graphite- like" entities on Pt, and an excess of "atomic" surface C ("C1") on Pt/K. The loss of activity and changes in selectivity - related to the regenerated state - were less pronounced on Pt/K. The presence of K on Pt: (i) stabilizes chemisorbed hydrogen, (ii) hinders accumulation of "massive" hydrocarbonaceous deposits, (iii) and promotes their removal during regeneration.

Original languageEnglish
Pages (from-to)419-423
Number of pages5
JournalCatalysis Communications
Volume5
Issue number8
DOIs
Publication statusPublished - Aug 2004

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Electron spectroscopy
Hexanes
Hexane
Washing
Hydrogen
Carbon
Deposits
X ray photoelectron spectroscopy
Impurities
Catalysts

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

Cite this

Effect of K on the deactivation of model Pt black catalysts : Electron spectroscopy and hexane test reaction. / Wootsch, A.; Wild, Ute; Schlögl, Robert; Paál, Z.

In: Catalysis Communications, Vol. 5, No. 8, 08.2004, p. 419-423.

Research output: Contribution to journalArticle

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