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Catalytic Transformation of C7-C9 Methyl Benzenes over USY-based FCC Zeolite Catalyst

Summary: Catalytic Transformation of C7-C9 Methyl Benzenes over USY-based FCC
Zeolite Catalyst
S. Al-Khattaf,
*, N. M. Tukur, A. Al-Amer and U, Al-Mubaiyedh
Chemical Engineering Department, King Fahd University of Petroleum & Minerals
Dhahran 31261, Saudi Arabia
Catalytic transformation of three methyl benzenes (toluene, m-xylene, and 1,2,4-trimethyl
benzene) has been investigated over USY based FCC zeolite catalyst in a novel riser
simulator at different operating conditions. The effect of reaction conditions on the variation
of isomerization to disproportionation products ratio (I/D), distribution of trimethylbenzene
(TMB) isomers (1,3,5-to-1,2,3-) and values of p-xylene/o-xylene (P/O) ratios are reported.
The sequence of reactivity of the three alkyl benzenes was found to decrease as the number
of methyl group per benzene ring decreases, as follows: 1,2,4-trimethyl benzene > m-xylene
> toluene. This is true at all temperatures investigated over the USY zeolite. This
phenomenon can be explained by the complex inter-relationship between the zeolite system
architecture and the competition that exists between reaction and diffusion during the
transformation reactions. This is further confirmed from the quasi-steady state
approximation modeling of the experimental data involving a decay function based on
"Time on Stream" that points to transformation reaction rates that have intermediate


Source: Al-Khattaf, Sulaiman - Department of Chemical Engineering, King Fahd University of Petroleum and Minerals


Collections: Fossil Fuels; Engineering