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Related Concept Videos

Heterogeneous Catalysis01:22

Heterogeneous Catalysis

Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...

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Ru(0001) model catalyst under oxidizing and reducing reaction conditions: in-situ high-pressure surface X-ray

Y B He1, M Knapp, E Lundgren

  • 1Department of Physical Chemistry, Justus-Liebig University, Heinrich-Buff-Ring, D-35392 Giessen, Germany.

The Journal of Physical Chemistry. B
|July 21, 2006
PubMed
Summary

The oxidation of the Ruthenium(0001) model catalyst to form Ruthenium dioxide (RuO2) films was studied in-situ. These RuO2 films are catalytically active and can be reduced by H2 and CO.

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Area of Science:

  • Surface science
  • Catalysis
  • Materials science

Background:

  • Ruthenium (Ru) based catalysts are crucial for various chemical reactions, including CO oxidation.
  • Understanding the oxidation behavior of Ru surfaces is essential for designing efficient catalysts.
  • Ruthenium dioxide (RuO2) is a key oxide phase with significant catalytic properties.

Purpose of the Study:

  • To investigate the in-situ oxidation of the Ru(0001) model catalyst under varying reaction conditions.
  • To determine the critical oxygen pressures and temperatures for the formation of catalytically active RuO2 films.
  • To study the reduction behavior of RuO2 films.

Main Methods:

  • Surface X-ray diffraction (SXRD) was employed using a high-pressure reaction chamber.
  • In-situ measurements were performed under controlled oxygen and CO atmospheres.
  • Varying oxygen partial pressures and preparation temperatures were explored.

Main Results:

  • Formation of the catalytically active RuO2(110) oxide film requires 20 mbar O2 in a CO/O2 mixture (2:1), but only 10(-5) mbar O2 in pure oxygen.
  • A self-limiting RuO2(110) film of 1.6 nm thickness is produced at preparation temperatures between 550-630 K.
  • The RuO2(110) film exhibits self-accelerated growth after an induction period.
  • RuO2 films on Ru(0001) are readily reduced by H2 and CO at 415 K without an induction period.

Conclusions:

  • The oxidation of Ru(0001) to form active RuO2(110) films is highly dependent on oxygen partial pressure and atmosphere composition.
  • Controlled self-limiting RuO2(110) films can be prepared under specific conditions.
  • The prepared RuO2 films demonstrate facile reducibility, suggesting potential for catalytic applications and regeneration.