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Highly sensitive silicon microreactor for catalyst testing.

Toke R Henriksen1, Jakob L Olsen, Peter Vesborg

  • 1Department of Micro- and Nanotechnology, Technical University of Denmark, DTU Nanotech Building 345 East, DK-2800 Kgs. Lyngby, Denmark.

The Review of Scientific Instruments
|January 12, 2010
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Summary
This summary is machine-generated.

A novel microfabricated chemical reactor enables highly sensitive measurements of catalytic activity. This silicon chip device accurately characterizes low-surface-area model catalysts using mass spectrometry.

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Area of Science:

  • Chemical Engineering
  • Materials Science
  • Surface Science

Background:

  • Characterizing low-surface-area model catalysts is crucial for fundamental understanding but challenging due to limited sample size.
  • Existing methods often struggle with sensitivity and require larger catalyst quantities.
  • Microfabrication offers a potential solution for creating sensitive, small-scale catalytic reactors.

Purpose of the Study:

  • To present a novel microfabricated chemical reactor for highly sensitive measurements of catalytic activity and surface kinetics.
  • To enable the characterization of model catalysts with very small surface areas.
  • To investigate and model the gas flow dynamics within the microreactor.

Main Methods:

  • Fabrication of a silicon chip-based microreactor for gas-phase reactions (0.1–5.0 bar).
  • Directing the entire gas flow through the catalyst bed to a mass spectrometer for high sensitivity.
  • Experimental investigation and theoretical modeling of gas flow and pressure relationships within the reactor.
  • Demonstration using CO oxidation on low-area platinum thin film catalysts.

Main Results:

  • The microreactor achieves high sensitivity by analyzing nearly all reaction products via mass spectrometry.
  • Experimental gas flow data align well with the developed theoretical model, predicting intermediate flow regime.
  • A gas flow of ~3x10^14 molecules/s and a residence time of ~11 s were observed under typical conditions.
  • Platinum catalysts with surface areas as small as 15 µm² were successfully characterized.

Conclusions:

  • The developed microfabricated reactor is highly effective for sensitive catalytic activity and surface kinetics measurements.
  • The device is particularly well-suited for characterizing small quantities of model catalysts.
  • The findings validate the reactor's design and its potential for fundamental catalysis research.