Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases p. 1811 - 1820 (1980)
Update date:2022-08-17
Topics:
Bridgewater, Alan J.
Burch, Robert
Mitchell, Philip C. H.
The activites and selectivities of Mo/C and Mo/Al2O3 catalysts (prepared by impregnating a coconut charcoal and γ-Al2O3, respectively, with ammonium heptamolybdate) have been determined for the reforming of cyclohexane, n-hexane, methylcyclopentane and n-heptane in a microreactor by pulse and flow techniques at 1 atm and 773 K.The Mo/C catalyst was more selective and more stable than the Mo/Al2O3 catalyst.The Mo/C catalyst was more active for dehydrogenation and dehydrocyclisation whereas Mo/Al2O3 was more active for ring expansion, isomerization and cracking.Over Mo/C in the pulse experiments the predominant cracked product was methane.The Mo/C catalyst behaved mainly as a metallic-type catalyst catalysing ring-closure reactions (n-hexane to benzene, n-heptane to toluene) directly and not via a methylcyclopentane intermediate, while the Mo/Al2O3 catalyst had both metallic and acidic functions.The molybdenum catalysts are compared with Pt/Al2O3 catalysts.
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