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Related Experiment Videos

Acetone oxidation using ozone on manganese oxide catalysts.

Yan Xi1, Corey Reed, Yong-Kul Lee

  • 1Environmental Catalysis and Nanomaterials Laboratory, Department of Chemical Engineering, Virginia Tech, Blacksburg, Virginia 24061, USA.

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

Supported manganese oxide catalysts efficiently oxidize acetone using ozone. Alumina-supported catalysts show higher activity and turnover frequencies, indicating a promising approach for catalytic oxidation with low pressure drop.

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Area of Science:

  • Catalysis
  • Materials Science
  • Environmental Chemistry

Background:

  • Developing efficient catalysts for volatile organic compound (VOC) oxidation is crucial for air quality control.
  • Manganese oxides are promising catalytic materials due to their redox properties.
  • Ozone addition can enhance catalytic oxidation efficiency at lower temperatures.

Purpose of the Study:

  • To prepare and characterize supported manganese oxide catalysts for acetone oxidation.
  • To investigate the effect of support material (alumina vs. silica) on catalytic performance.
  • To elucidate the reaction mechanism using in situ spectroscopy.

Main Methods:

  • Impregnation of alumina foam blocks with alumina and silica washcoats.
  • Preparation of supported manganese oxide catalysts (10 wt% MnO2).

Related Experiment Videos

  • Characterization using Mn K-edge EXAFS and temperature-programmed reduction (TPR).
  • Acetone catalytic oxidation experiments with and without ozone.
  • In situ steady-state Raman spectroscopy.

    • Main Results:

    • Catalysts exhibited Mn K-edge EXAFS profiles similar to Mn3O4 and beta-MnO2.
    • Acetone oxidation was significantly accelerated by ozone, reducing reaction temperatures.
    • Alumina-supported catalysts demonstrated higher activity and turnover frequencies (TOFs) for acetone and ozone conversion compared to silica-supported ones.
    • Low pressure drop was observed across the foam catalysts.
    • In situ Raman spectroscopy identified adsorbed acetone and peroxide species.

    Conclusions:

    • Supported manganese oxide catalysts are effective for acetone oxidation, with alumina showing superior performance.
    • Ozone co-oxidation enhances catalytic activity and lowers reaction temperatures.
    • The catalyst structure and support material play critical roles in catalytic efficiency.
    • The study provides insights into the reaction mechanism through in situ spectroscopic analysis.