Title of Thesis
Factors Affecting the Activity of Solid Catalysts
for C-C and C-H Bonds Cleavage of Hydrocarbons
National Centre for Excellence in Physical
Chemistry / University of Peshawar, Peshawar
|Number of Pages|
|Keywords (Extracted from title, table of contents and
abstract of thesis)|
Affecting, Activity, Solid, Catalysts,
hydrogenation, isomerization, Cleavage, Hydrocarbons
The reactions of isopropanol and cyclohexane via the cleavage of C-H and C-C bonds have been studied over various solid catalysts both commercial and laboratory prepared.
All the catalysts were characterized by surface area measurements and x-ray diffraction analysis. The gaseous reactants were passed over the catalysts placed in a glass microcatalytic
reactor in continuous reactant flow mode. The reactor effluents were
analyzed by a gas chromatograph equipped with an F.I.D. detector.
Dehydrogenation of isopropanol led to the formation of acetone while hydrogenation/isomerization of cyclohexane produced methylcyclopentane (M. C. P.). benzene and some high boiling point compounds. 10 % (Cu/Cr2O3)/ZrO2 was found to be the most active catalyst for isopropanol conversion in oxygenated atmosphere. No deactivation of this catalyst was found for longer contact times. X.R.D. analysis shows that the ZrO2 present in the sample is monoclinic. The oxygen assisted isomerization of cyclohexane to M.C.P. was a function of temperature and oxygen partial pressure.
Dehydrogenation of cyclohexane over platinized surfaces leads to the formation of benzene in N, atmosphere. No increase in activity was found for platinized catalysts with loading higher than 5-6% pt. Deactivation of these catalysts was reversible. The catalysts were regenerated in
H2 flow followed by treatment in N2flow.