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Factors Affecting the Activity of Solid Catalysts for C-C and C-H Bonds Cleavage of Hydrocarbons

Shah, Subhanullah (1999) Factors Affecting the Activity of Solid Catalysts for C-C and C-H Bonds Cleavage of Hydrocarbons. PhD thesis, University of Peshawar, Peshawar .



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.

Item Type:Thesis (PhD)
Uncontrolled Keywords:Affecting, Activity, Solid, Catalysts, hydrogenation, isomerization, Cleavage, Hydrocarbons
Subjects:Physical Sciences (f) > Chemistry(f2)
ID Code:6719
Deposited By:Mr. Javed Memon
Deposited On:21 Jul 2011 10:20
Last Modified:12 Dec 2011 09:04

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