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Understanding CO oxidation on the Pt(111) surface based on a reaction route network
Kanami Sugiyama1, Yosuke Sumiya, Makito Takagi
1Graduate School of Chemical Sciences and Engineering, Hokkaido University, Sapporo, 060-8628, Japan.
This study investigated CO oxidation on platinum surfaces using artificial force induced reaction (AFIR) and rate constant matrix contraction (RCMC) methods. The CO2 generation step was identified as the reaction bottleneck, consistent with the Langmuir-Hinshelwood mechanism.
Area of Science:
- Surface science
- Chemical kinetics
- Computational chemistry
Background:
- Understanding catalytic reaction mechanisms on solid surfaces is crucial.
- CO oxidation on Pt(111) is a model system for heterogeneous catalysis.
Purpose of the Study:
- To systematically analyze the CO oxidation reaction mechanism on the Pt(111) surface.
- To identify the rate-limiting step and understand contributing factors like migration and entropy.
Main Methods:
- Artificial Force Induced Reaction (AFIR) method for reaction path searching.
- Construction of a comprehensive reaction route network.
- Rate Constant Matrix Contraction (RCMC) for kinetic analysis.
Main Results:
- A detailed reaction route network including bond rearrangement and migration paths was generated.
- The CO2 generation step was identified as the bottleneck of the overall reaction.
- Results align with the Langmuir-Hinshelwood mechanism, considering O2 dissociation.
Conclusions:
- The combined AFIR and RCMC approach provides a systematic method for analyzing complex surface reactions.
- Multiple reaction paths and entropic contributions from adsorbed species migration significantly impact the reaction dynamics.
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