| (1)H and (13)C MAS NMR studies of light alkanes activation over MFI zeolite modified by Zn vapour. | |
| | |
MedLine Citation:
|
PMID: 19286356 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
The early stages of methane, ethane and propane conversion were studied by in situ (1)H and (13)C MAS NMR techniques over fully exchanged Zn(2+)/MFI catalyst obtained by the reaction with zinc vapour. The in situ techniques revealed strong interaction of alkanes with Zn(2+) cations evidenced by significant shift of the corresponding NMR lines. Besides that, the formation of methyl zinc, ethyl zinc and n-propyl zinc species along with bridging and silanol surface OH-groups was detected already at the ambient temperature. These results pointed to dissociative adsorption of alkanes over (ZO)-Zn(2+)-(OZ) and (ZO)-Zn(2+)-(OSi) active sites of the catalyst. The dissociative adsorption was shown to be a dead-end surface reaction in the case of methane starting reactant, while in the case of ethane and propane, it appeared to be responsible for the initiation of the catalytic cycle leading to alkenes and dihydrogen formation and regeneration of zinc containing catalytic sites. |
| | |
Authors:
|
Yuriy G Kolyagin; Irina I Ivanova; Yuri A Pirogov |
Related Documents
:
|
15351276 - A differential assay for the reduced and oxidized states of metallothionein and thionein. 22239746 - Infrared spectroscopy of si(co)n+ complexes: evidence for asymmetric coordination. 2692616 - Structural transition in the metal-free hexamer of protein-engineered [b13 gln]insulin. 20405836 - Synthesis and spectroscopic and computational characterization of zn4o(alicyclic or aro... 20078096 - High-frequency electron paramagnetic resonance analysis of the oxidation state and loca... 21582546 - N-(2,4-dimethyl-phen-yl)-2-methyl-benzamide. |
Publication Detail:
|
Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2009-02-12 |
Journal Detail:
|
Title: Solid state nuclear magnetic resonance Volume: 35 ISSN: 0926-2040 ISO Abbreviation: Solid State Nucl Magn Reson Publication Date: 2009 Apr |
Date Detail:
|
Created Date: 2009-04-07 Completed Date: 2009-07-07 Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 9306181 Medline TA: Solid State Nucl Magn Reson Country: Netherlands |
Other Details:
|
Languages: eng Pagination: 104-12 Citation Subset: IM |
Affiliation:
|
Department of Chemistry, Moscow State University, Lenin Hills 1/3, 119991 Moscow, Russia. |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Alkanes
/
chemistry* Carbon Isotopes / analysis, chemistry* Catalysis Computer Simulation Gases / chemistry Magnetic Resonance Spectroscopy / methods* Models, Chemical* Models, Molecular* Molecular Conformation Protons Zeolites / analysis, chemistry* Zinc / chemistry* |
| Chemical | |
Reg. No./Substance:
|
0/Alkanes; 0/Carbon Isotopes; 0/Gases; 0/Protons; 1318-02-1/Zeolites; 7440-66-6/Zinc |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Investigation on the Beckmann rearrangement reaction catalyzed by porous solids: MAS NMR and theoret...
Next Document: Implications of regular solution theory on the release mechanism of catanionic mixtures from gels.