On the Mechanisms of Carbon Formation Reaction on Ni(111) Surface
| Autor: | Jimmy X. Li, John J. Hoffman, Hansong Cheng, Xiaowei Tang, Kevin Ray Heier, Qingfan Zhang, Agnes Derecskei-Kovacs, Bo Han, Stephanie L. Britton, Minfa Lin |
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| Rok vydání: | 2012 |
| Předmět: |
Chemistry
Reaction formation High activation Rate-determining step Photochemistry Dissociation (chemistry) Surfaces Coatings and Films Electronic Optical and Magnetic Materials General Energy Adsorption Computational chemistry Molecule Moiety Density functional theory Physical and Theoretical Chemistry |
| Zdroj: | The Journal of Physical Chemistry C. 116:16522-16531 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/jp303648c |
| Popis: | The carbon formation reaction (abbreviated in this work from now on as CFR) is an industrially important chemical process. Using density functional theory, we explored the detailed mechanisms of the process on the Ni(111) surface. Four possible reaction pathways that give rise to carbon deposition on the surface were examined based on minimum energy path calculations. It was found that both the direct dissociation of CO on the surface and the pathway in which a gas phase H2 molecule reacts with an adsorbed CO molecule to produce a gas phase water molecule and a C adatom are kinetically difficult due to the high activation energies. It was identified that the rate limiting step along the reaction pathway is CO* + 2H* → HCO* + H*. Comparison of the calculated energetic profiles of the CFR process on both the Ni(111) and the γ-Fe(111) surfaces was also made. Both the H atom and the CO moiety exhibit high mobility on the surfaces after adsorption, which allows them to readily react with various surface specie... |
| Databáze: | OpenAIRE |
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