A sensitive method for determining dehydrogenation probabilities at a metal surface
Behrouz Sabour1, Bayenah O Al-Shami1, Johannes V Diedrich2,3
1Texas Tech University, Department of Chemistry and Biochemistry, Lubbock, Texas 79409, USA.
The Journal of Chemical Physics
|July 16, 2026
Summary
Researchers developed a new method to track surface hydrogen using methanol dehydrogenation kinetics on platinum. This study reveals insights into direct and precursor-mediated reaction mechanisms.
Area of Science:
- Surface Science
- Chemical Kinetics
- Heterogeneous Catalysis
Background:
- Understanding surface reactions is crucial for catalysis.
- Methanol dehydrogenation on platinum is a key reaction in surface chemistry.
- Accurate measurement of surface hydrogen coverage is challenging.
Purpose of the Study:
- To develop a sensitive method for tracking surface hydrogen coverage.
- To investigate methanol-d4 dehydrogenation on Pt(111).
- To elucidate the reaction mechanisms involved.
Main Methods:
- Utilized a high-repetition rate implementation of velocity-resolved kinetics.
- Probed second-order reaction kinetics of D2 and HD formation.
- Studied methanol-d4 dehydrogenation over a surface temperature range of 700-950 K.
Main Results:
- Developed a sensitive approach for tracking surface hydrogen coverage.
- Methanol dehydrogenation probability was low (∼10-3) and showed weak temperature dependence, suggesting a direct mechanism.
- Methanol clustering increased dehydrogenation probability at low temperatures, indicating a precursor-mediated mechanism.
Conclusions:
- The study successfully demonstrated a novel method for monitoring surface hydrogen.
- Reaction pathways for methanol dehydrogenation on Pt(111) depend on incident beam conditions.
- Cluster formation can significantly influence surface reaction dynamics.
