Methane Activation over Zn-Modified MFI Zeolite: NMR Evidence for Zn−Methyl Surface Species Formation
| Autor: | Vitaly V. Ordomsky, Yuriy G. Kolyagin, Antoine Gédéon, Yuri A. Pirogov, Irina I. Ivanova |
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| Rok vydání: | 2008 |
| Předmět: |
In situ
Inorganic chemistry chemistry.chemical_element Zinc Dissociative adsorption Dissociation (chemistry) Methane Surfaces Coatings and Films Electronic Optical and Magnetic Materials Catalysis chemistry.chemical_compound General Energy Adsorption chemistry Physical and Theoretical Chemistry Zeolite |
| Zdroj: | The Journal of Physical Chemistry C. 112:20065-20069 |
| ISSN: | 1932-7455 1932-7447 |
| DOI: | 10.1021/jp8067766 |
| Popis: | The early stages of methane activation over Zn-modified H-MFI catalysts obtained by high-temperature reaction with zinc vapor have been studied by 13C MAS NMR in situ. Methane 99.9% enriched with 13C was used as labeled reactant. The spectroscopic data pointed to formation of zinc methyl species at ambient temperature just after methane adsorption onto the zeolite sample. The results suggest that methane activation occurs via dissociative adsorption over acid−base Zn−O pairs involving Zn2+ cations and negatively charged oxygen atoms of the zeolite framework. The nature of the sites responsible for the dissociation is discussed. |
| Databáze: | OpenAIRE |
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