SYNTHESIS OF BARIUM HEXAFERRITE AND CATALYTIC BEHAVIOR IN THE COMBUSTION OF METHANE

Barium hexaferrite doped with iridium was synthesized by two methods: the citrate gel and the polyacrylamide gel methods. The nature of phas es obtained and the specific surface area were determined after heat t reatments in air at 700 degrees C, 900 degrees C and in air containing 10% humidity at 1200 degrees C. The catalytic activity in the combust ion of methane was measured after heat treatment at 900 degrees C. The se hexaferrites showed a good catalytic activity after treatment at 90 0 degrees C. However this catalytic activity and the specific surface disappeared after heat treatment at 1200 degrees C.