Surface and structural properties of Pt/CeO2catalyst under preferential CO oxidation in hydrogen (PROX)

Detre Teschner, A. Wootsch, Olga Pozdnyakova, Hermann Sauer, Axel Knop-Gericke, Robert Schlögl

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Preferential oxidation of CO in the presence of excess hydrogen was studied on Pt/CeO2with 5% metal loading. Catalytic data were similar to those observed on 1% Pt/CeO2earlier [16]. The optimum temperature region is T£373 K; conversion and selectivity of CO oxidation strongly decreased at higher temperatures. High-pressure XPS indicated CO adsorbed on platinum particles and significant amount of water on the ceria surface. The top-most ceria surface re-oxidized as small amount of oxygen (3%) was introduced into the H2/CO feed. Despite this surface re-oxidation, high-resolution TEM after reaction indicated oxygen deficient ceria bulk structure, in which the defects formed a super-cell, with CeO 1.695structure. The defective ceria is suggested to play an important role stabilizing the hydrogen bonded surface water, which (i) suppresses further hydrogen oxidation and (ii) reacts at the metal/support interface with linearly adsorbed CO in a low temperature water-gas-shift type reaction to produce CO2.

Original languageEnglish
Pages (from-to)235-247
Number of pages13
JournalReaction Kinetics and Catalysis Letters
Volume87
Issue number2
DOIs
Publication statusPublished - Apr 2006

Fingerprint

Cerium compounds
Carbon Monoxide
surface properties
Surface properties
Structural properties
Hydrogen
Oxidation
oxidation
hydrogen
Metals
Oxygen
Water gas shift
oxygen
surface water
Surface waters
metals
Temperature
water
Platinum
platinum

Keywords

  • Ceria
  • High pressure XPS
  • HRTEM
  • Hydrogen purification
  • Platinum
  • Preferential CO oxidation
  • PROX
  • Pt/CeO

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Catalysis

Cite this

Surface and structural properties of Pt/CeO2catalyst under preferential CO oxidation in hydrogen (PROX). / Teschner, Detre; Wootsch, A.; Pozdnyakova, Olga; Sauer, Hermann; Knop-Gericke, Axel; Schlögl, Robert.

In: Reaction Kinetics and Catalysis Letters, Vol. 87, No. 2, 04.2006, p. 235-247.

Research output: Contribution to journalArticle

Teschner, Detre ; Wootsch, A. ; Pozdnyakova, Olga ; Sauer, Hermann ; Knop-Gericke, Axel ; Schlögl, Robert. / Surface and structural properties of Pt/CeO2catalyst under preferential CO oxidation in hydrogen (PROX). In: Reaction Kinetics and Catalysis Letters. 2006 ; Vol. 87, No. 2. pp. 235-247.
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