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Related Experiment Videos

Temperature patterns on a hollow cylindrical catalytic pellet.

J. Annamalai1, M. A. Liauw, D. Luss

  • 1Department of Chemical Engineering, University of Houston, Houston, Texas 77204-4792.

Chaos (Woodbury, N.Y.)
|June 5, 2003
PubMed
Summary

Catalytic oxidation of carbon monoxide exhibits complex temperature patterns and irregular behavior. Nonuniform catalysts and reactor conditions lead to intricate pulse splitting and extinction phenomena.

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Hot zones evolution and dynamics in heterogeneous catalytic systems.

Chaos (Woodbury, N.Y.)·2003
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Area of Science:

  • Chemical Engineering
  • Catalysis
  • Reaction Engineering

Background:

  • Atmospheric oxidation of carbon monoxide (CO) is crucial for pollution control.
  • Understanding catalytic reactions on solid supports is vital for process design.
  • Hollow cylindrical catalysts offer unique surface area and mass transfer properties.

Purpose of the Study:

  • To investigate the atmospheric oxidation of carbon monoxide on a hollow cylindrical catalytic pellet.
  • To analyze the resulting temperature patterns and reaction dynamics under varying conditions.
  • To understand the influence of catalyst nonuniformity and transport phenomena on reaction stability.

Main Methods:

  • Utilized a conical reactor for simultaneous temperature measurement on the pellet's top and side using an IR imager.

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  • Performed atmospheric oxidation of a 6 vol % carbon monoxide mixture.
  • Observed transitions from a high-temperature ignited state to nonuniform states with temperature fronts.

    • Main Results:

    • Observed intricate pulse splitting and extinction phenomena on both the top and side of the pellet.
    • Demonstrated that catalyst nonuniformity and transport significantly influence temperature fronts and patterns.
    • Reported highly irregular motions and conversions following a decrease in reactor temperature.
    • Identified global coupling as a stabilizing factor for temperature fronts and patterns.

    Conclusions:

    • The atmospheric oxidation of CO on a hollow cylindrical catalyst is characterized by complex, dynamic temperature patterns.
    • Catalyst and reactor design, including transport phenomena, critically affect reaction stability and behavior.
    • Nonuniformity and global coupling play key roles in stabilizing intricate reaction patterns and fronts.