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A temperature-adjustable in situ infrared diffuse reflectance spectroscopy system for catalysts.

Weifeng Huang1,2, Tao Chen1, Jun Luo2

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A new infrared system rapidly analyzes catalyst behavior across temperatures (-180 to 300°C). Pt/CeO2/CNT catalysts show strong oxygen adsorption at low temperatures and desorption at high temperatures, aiding efficient catalyst design.

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Area of Science:

  • Catalysis
  • Materials Science
  • Spectroscopy

Background:

  • Catalyst performance is highly dependent on operating temperature.
  • Accurate *in situ* characterization under varying temperatures is crucial for catalyst development.
  • Existing methods for catalyst evaluation can be time-consuming.

Purpose of the Study:

  • To introduce a novel *in situ* infrared diffuse reflection spectroscopy system with temperature control.
  • To investigate the temperature-dependent behavior of Pt-based catalysts.
  • To accelerate the assessment of catalyst properties and guide future catalyst design.

Main Methods:

  • Development of an *in situ* infrared diffuse reflection rapid detection system with temperature regulation (-180 to 300 °C).
  • Acquisition and analysis of infrared absorption spectra for four Pt-based catalysts under vacuum.
  • Application of IR correlation spectroscopy to analyze spectral variations.

Main Results:

  • The system successfully obtained infrared spectra across a wide temperature range.
  • Pt/CeO2/CNT catalysts exhibited significant changes in peak intensity with temperature.
  • Observed robust adsorption of oxygen-containing groups at low temperatures and desorption at high temperatures.

Conclusions:

  • The developed system enables rapid and accurate *in situ* assessment of catalyst behavior.
  • Temperature-dependent adsorption and desorption properties of catalysts were elucidated.
  • The findings provide valuable insights for synthesizing more efficient catalysts.