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Related Experiment Videos

Scanning mass spectrometer for quantitative reaction studies on catalytically active microstructures.

M Roos1, S Kielbassa, C Schirling

  • 1Institute of Surface Chemisty and Catalysis, Ulm University, D-89069, Ulm, Germany.

The Review of Scientific Instruments
|September 4, 2007
PubMed
Summary
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This study introduces a scanning mass spectrometry apparatus for precise gas analysis of microstructures. The system enables quantitative reaction rate determination on individual microstructures with high spatial resolution.

Area of Science:

  • Chemical Engineering
  • Surface Science
  • Analytical Chemistry

Background:

  • Understanding catalytic reactions at the microscale is crucial for catalyst design.
  • Previous methods lacked the spatial resolution to analyze individual microstructures.
  • Evaluating gas phase mass transport effects is essential for accurate reaction kinetics.

Purpose of the Study:

  • To develop an apparatus for spatially resolved scanning mass spectrometry.
  • To quantitatively measure reaction rates on individual microstructures.
  • To evaluate gas phase mass transport effects in microstructured catalytic systems.

Main Methods:

  • Utilized a piezoelectrically driven positioning substage for precise sample manipulation.
  • Employed a capillary probe connected to a mass spectrometer for gas analysis.

Related Experiment Videos

  • Performed measurements under reaction conditions (10⁻²–10 mbar, RT–450 °C).

    • Main Results:

    • Achieved lateral resolution better than 100 µm for gas composition analysis.
    • Demonstrated quantitative determination of reaction rates on individual Pt microstructures.
    • Observed rapid decay in lateral resolution with increasing probe-sample distance, indicating gas transport effects.

    Conclusions:

    • The developed apparatus enables spatially resolved analysis of microcatalytic reactions.
    • Accurate reaction rates can be determined for individual microstructures.
    • The system is suitable for studying gas phase mass transport phenomena in microstructured reactors.