Patent ID: 7232789

Claim:
A method of preparing a chromium oxide catalyst for preparation of pentafluoroethane from a chloroethane compound, said method comprising the steps of: heat treating a chromium hydroxide powder at a temperature not higher than 300° C. to obtain chromium oxide powder; heat treating a metal hydroxide at a temperature not higher than 300° C. to obtain metal oxide powder, said metal hydroxide being selected from a group consisting of magnesium hydroxide, iron hydroxide, molybdenum hydroxide, vanadium hydroxide and aluminum hydroxide; mixing 85% to 99.5% by weight of said chromium oxide powder with 0.5% to 15% by weight of the metal oxide powder so as to obtain a mixture; forming said mixture into a pellet; burning said pellet at 200° C. to 300° C. with nitrogen gas; and fluorinating the burned pellet at 300° C. to 320° C. with a gas mixture containing N 2 and HF and then at 320° C. to 380° C. with HF gas.