Abstract
ABSTRACT The catalytic cracking of methylcyclohexane over an industrial FCC catalyst (containing Y-zeolite) has been studied in the Temporal Analysis of Products (TAP) reactor. High selectivities towards toluene were observed (S tol ≈ 70 %). The unusual product distribution originates from a predominant protolytic cracking that is favored by the low pressures and high concentration of acid sites applied in the TAP reactor. The formation of the other cracking products (benzene and smaller paraffins and olefins) is well accounted for by the relative stability of the secondary and tertiary carbenium ions. The catalytic cracking of methylcyclohexane can be adequately modeled by a reaction scheme by which the secondary and tertiary carbenium ions are formed in parallel. The activation energies for the formation of toluene and benzene are 144 kJ mol - 1 and 220 kJ mol - 1 respectively. This is in line with thermodynamic considerations concerning the stability of carbenium ions.
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