Analysing and understanding the active site by IR spectroscopy

Area of Science:

• Catalysis and Surface Science
• Spectroscopic Techniques
• Chemical Reaction Mechanisms

Background:

• Infrared (IR) spectroscopy is crucial for elucidating catalytic reaction mechanisms.
• Understanding surface mechanisms at the molecular level is key in catalysis research.
• In situ and operando approaches provide dynamic insights into catalytic processes.

Purpose of the Study:

• To review significant advancements in using IR spectroscopy for catalytic reaction studies.
• To present methodologies for observing active sites and analyzing surface properties.
• To critically assess the role of active sites, catalytic steps, and reaction intermediates.

Main Methods:

• In situ and operando IR spectroscopy for real-time reaction monitoring.
• Probe molecule adsorption for characterizing active sites.
• Qualitative and quantitative analysis of surface species and their properties.
• Literature review based on extensive laboratory experience.

Main Results:

• Demonstration of IR spectroscopy's capability to probe catalytic surface mechanisms.
• Examples illustrating the analysis of physical-chemical properties of surface entities.
• Methods for discriminating the role of active sites in catalytic steps.
• Critical discussion on the visibility of reaction intermediates using spectroscopic techniques.

Conclusions:

• IR spectroscopy is a powerful tool for understanding catalytic mechanisms at the molecular level.
• In situ and operando techniques significantly enhance the study of catalytic reactions.
• Further research is needed to improve the detection and characterization of reaction intermediates.