The isomerization of m-xylene was studied by the continuous flow method under pressure. The activation energies for the isomerization of m-xylene to p-xylene and o-xylene were 30.32 kcal/mol under the pressures of 300 kg/cm2, 2000 kg/cm2 and 4000 kg/cm2. When the reaction pressure increased from 300 kg/cm2 to 5000 kg/cm2, log km, i, and log knto increased by 1.3, as was shown in Fig.2. The activation volume, which may be considered to correspond to the dif- ference in molar volume of m-xylene between a chemisorbed state and an activated state, was obtained from Fig.2 and was shown in Fig.3. From these results the chemisorbed state and the activated state of m-xylene were discussed.
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