Surface species formed during propane aromatization over Zn/MFI catalyst as determined by in situ spectroscopic techniques

Autor:	Yuri A. Pirogov, Irina I. Ivanova, Elena M. Pasynkova, Yuriy G. Kolyagin, Ekaterina V. Asachenko, Vitaly V. Ordomsky
Rok vydání:	2009
Předmět:	Alkane chemistry.chemical_classification Chemistry Process Chemistry and Technology Inorganic chemistry Aromatization chemistry.chemical_element Reaction intermediate Zinc Heterogeneous catalysis Catalysis Propene chemistry.chemical_compound Propane Physical and Theoretical Chemistry
Zdroj:	Journal of Molecular Catalysis A: Chemical. 305:47-53
ISSN:	1381-1169
DOI:	10.1016/j.molcata.2008.10.051
Popis:	The propane conversion was studied by in situ 1H, 13C MAS NMR and IR spectroscopic techniques over Zn/H-MFI catalyst. Propane 2-13C, propane 1-13C, propene 1-13C, propene 2-13C and benzene 13C were used as labelled reactants. The results pointed to the propane activation via dissociative adsorption over zinc oxide sites, as evidenced by zinc propyl surface species observation at the onset of propane conversion. Zinc propyl species convert further into propene, which forms asymmetric π-complex with zinc cations. At the later reaction steps, propene oligomerizes to give charge delocalized carbanionic species stabilized on zinc cations. The role of carbanionic species in consecutive reaction steps is discussed.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::426fad5135abc000cf8994a332e479d7 https://doi.org/10.1016/j.molcata.2008.10.051 Zobrazit plný text záznamu Full Text from ScienceDirect