decomposition of 2-propanol over vanadium pentoxide and modified vanadium pentoxide catalysts
abstract
the catalytic decomposition of 2-propanol has been investigated
in a flow system from 200-300°c on vanadium pentoxide and modified
vanadium pentoxide catalysts.
dehydration, dehydrogenation and propane formation were observed
over the temperature range studied. the propane reaction was predominant
at higher temperatures.
kinetic experiments showed the dehydration and dehydrogenation
reactions to be zero order with respect to all components while the propane-
forming reaction was found to have a rate order of 0.3 with respect
to 2-propanol. the kinetics for the reactions were interpreted in terms
of the langmuir-hinshelwood model and elimination type mechanisms have
been proposed to account for the 2-propanol decomposition.
trends in activity and activation energies for the dehydration
reaction have been correlated with the mobility of surface oxygen
previously reported in the literature. some correlations were obtained
with activation energies for dehydration reactions in similar systems.
the reduction of the catalysts used, as indicated by changes
in surface area and x-ray powder diffraction patterns, has been related
to oxygen mobility and to the surface 'tammann* temperature of the
additive.
collections
- retrospective theses [1604]