ISSN:
1572-9028
Keywords:
propane activation
;
mechanism
;
zeolites
;
H-ZSM-5
;
MAS NMR
;
carbenium ions
;
carbonium ions
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract 13C MAS NMR study of the early stages of propane 2-13C activation was performed over H-ZSM-5 catalysts with various content of protonic and aprotonic sites. The reaction mechanism was tested by addition of various probe-molecules (C3H6, C6H6, H2, H2O and CO). The results on tracing the fate of 13C label during this experiments conclude to a monofunctional mechanism involving propane protonation on the strong Brønsted sites of H-ZSM-5 and the formation of carbonium ion type transition states, which further evolve in four different ways leading to 13C scrambling in propane, cracking, dehydrogenation and disproportionation.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1019139111671
