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A kinetic investigation was conducted for the toluene disproportionation reaction in the presence of a particular zeolite, namely (0.2 wt %) nickel-loaded mordenite with a silica:alumina ratio of 23. Process variables studied were catalyst size, temperature, and contact time. The reaction rate constants calculated on the basis of a reversible second-order reaction model fitted an Arrhenius function of temperature with an apparent activation energy of 14.5 kcal/mol. For the falling rate period, the activity of the catalyst ( ) decreased with time on stream (t) according to the relationship = 0oe~mf, where m was approximately equal to 3 X 10"3 at 350 °C and above.Kinetic studies of toluene disproportionation are mainly confined to conventional acid catalysts (Izumi and Shiba, 1963; Ai et al., 1965;Ogawa et al., 1969; Iwamura et al., 1971). Although zeolites have been proved to be highly active catalysts for this reaction, there are only a few reports on kinetic studies using such a type of catalysts, namely, that of Yashima et al. (1970) on H-mordenite, and Aneke et al. (1979) ón a composite catalyst containing H-Y zeolite, A1F3, and copper. The present paper describes the