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The most active zeolite hydroisomerization catalyst found during the course of a series of screening experiments was palladium impregnated hydrogen mordenite. The high activity of hydrogen mordenite catalyst was also reported by research workers of the Shell Oil Company. (71)Typical conditions used in this study were 55OoF., 450 Ib./sq.in. gauge, 8 g. of n-pentone fed /h./g. of catalyst, and a hydrogen/pentane molar ratio of 3.4.Process variable studies have shown that neither gas to particle mass transfer, intraparticle (macro-pore) diffusion, nor the chemical reactions at the palladium sites are rate limiting. The data can be correlated by a mathematical model based on the assumptions that a first-order, reversible isomerization reaction on the mordenite acidic sites is rate-controlling, and the apparent rate constant is an Arrhenius function of the temperature of the system. The pressure dependency of the reaction rate constant is consistent with a dual-site mechanism and Langmuir adsorption isotherms.