The kunetics of benzene hydrogenation over a rhodium-αalumina catalyst was studied in a differential flow reactor with temperature range from 323 K , benzene partial pressures from 0.67 kPa to 5.33 kPa and hydrogen partial pressures from 24 kPa to 96 kPa. The main reaction product was cyclohexane and some cyclohexene was detected byt its amount was very small to be neglected. The apparent activation energies of the hydrogenation reaction appeared 48.1 kJ/mol in the temperature range of 323-383 K, and unusually 62.8 kJ/mol between 473-536.5 K revealing the existence of maximum rate at certain temperature range. The temperature of the maximum rate shifted from 453^oK at 96 kPa hydrogen pressures to 408 K at 24 kPa. All these phenomena are examined and the reaction mechanism also suggested.