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Mn monolayer modified Rh for syngas-to-ethanol conversion: a first-principles study.
Fengyu Li1, De-en Jiang, Xiao Cheng Zeng
1Department of Physics, Department of Chemistry, University of Puerto Rico, Rio Piedras Campus, San Juan, PR 00931, USA.
Nanoscale
|November 11, 2011
Summary
Manganese (Mn) promoters significantly enhance rhodium (Rh)
Area of Science:
- Catalysis
- Surface Science
- Computational Chemistry
Background:
- Rhodium (Rh) catalysts are known for converting syngas to ethanol.
- Promoters are often used to enhance catalyst performance.
- Understanding the mechanism of syngas conversion on Rh surfaces is crucial.
Purpose of the Study:
- To investigate the catalytic performance of pure and manganese (Mn) modified Rh(100) surfaces for ethanol formation from syngas.
- To elucidate the mechanistic role of Mn promoters in enhancing Rh selectivity.
- To provide new insights into the key reaction steps involved in syngas to ethanol conversion.
Main Methods:
- Systematic first-principles computations were employed.
- The study focused on the Rh(100) surface, both pure and modified with a Mn monolayer.
- Key reaction steps, including CO dissociation and CO insertion, were analyzed.
Main Results:
- CO dissociation barrier on the Mn-modified Rh(100) surface is reduced by approximately 1.5 eV compared to pure Rh(100).
- The reaction barrier for CO insertion into the chemisorbed CH(3) group is 0.34 eV lower on the Mn-modified surface compared to methane formation.
- Mn promoters significantly lower activation barriers for critical reaction steps.
Conclusions:
- Manganese promoters play a crucial role in enhancing the selectivity of rhodium catalysts for ethanol production from syngas.
- The study provides mechanistic understanding of how Mn promoters facilitate CO dissociation and CO insertion.
- These findings offer valuable insights for designing more efficient catalysts for syngas conversion.
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