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

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.