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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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Development of Heterogeneous Enantioselective Catalysts using Chiral Metal-Organic Frameworks (MOFs)
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Indications for a surface temperature excess in heterogeneous catalysis.

Lianjie Zhu1, Gert Frens

  • 1Department of Chemical Technology, Delft University of Technology, Julianalaan 136, 2628 BL Delft, The Netherlands. zhu@nano.ku.dk

The Journal of Physical Chemistry. B
|September 15, 2006
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Summary

Surface temperature excess, the difference between real reaction and measured catalyst temperatures, explains curved Arrhenius plots in heterogeneous catalysis. This finding offers a new perspective on gas-solid catalytic systems.

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Area of Science:

  • Heterogeneous Catalysis
  • Surface Chemistry
  • Chemical Kinetics

Background:

  • Arrhenius plots in heterogeneous catalysis often exhibit curvature.
  • This curvature has been a long-standing puzzle in the field.
  • Surface temperature variations are a potential explanation for this phenomenon.

Purpose of the Study:

  • To investigate the concept of surface temperature excess (DeltaT) in catalytic reactions.
  • To explain the origin of gradually curved Arrhenius plots.
  • To provide a new insight into gas-solid catalytic systems.

Main Methods:

  • Analysis of experimental data for CO oxidation over Pd/gamma-Al(2)O(3) catalysts.
  • Exploration of the surface temperature excess (DeltaT = T(r) - T(m)).
  • Comparison of real reaction temperature (T(r)) with measured catalyst (T(m)) and gas (T(g)) temperatures.

Main Results:

  • A surface temperature excess, positive or negative, can explain curved Arrhenius plots.
  • Using the real reaction temperature (T(r)) linearized the Arrhenius plot.
  • The surface temperature excess is linked to coupled reaction and heat transport fluxes.
  • The magnitude of DeltaT is approximately 10 K and increases exponentially with reaction temperature.

Conclusions:

  • Surface temperature excess is a key factor influencing observed kinetics in heterogeneous catalysis.
  • The proposed model provides a general explanation for curved Arrhenius plots.
  • This understanding is crucial for accurate kinetic modeling and catalyst design.