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Kinetics of the chlorination of Nb 2 O 5 powder by CCl 4 vapor in mixture with N 2 in a static bed in the temperature range of 698 to 853 K were carried out at different partial pressures of CCl 4 ( ), p CCl4 varying from 0.10 to 0.75 atm. The fraction of Nb 2 O 5 chlorinated R at of 0.6 atm in the p CCl4 temperature range of 698 to 773 K was found to be proportional to time t, and the activation energy E is calculated to be 112 kJ/mole. Results on the effect of (0.4, 0.6, and 0.75 atm) at 723 K p CCl4 suggest that the rate v (R/min) is proportional to . However, at of 0.2 atm, R is not linear