Abstract
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.
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