BaFexAl(12-x)O-19 system for high-temperature catalytic combustion: Physico-chemical characterization and catalytic activity

Data on the physico-chemical characterization and on the catalytic activity inCH4 combustion of BaFe12O19 and BaFexAl(12¡x)O19 samples (xD1, 3, 6, 9) are reported. BaFe12O19 shows good catalytic activity in CH4 combustion, but does not possess the required thermal stability. It completely sinters upon calcination at temperatures higher than 1000±C and deactivates both on increasing the calcination temperature and upon treatment at 900±C under reaction conditions. The catalytic properties of this system completely degenerate upon calcination at 1300 C. Deactivation seems to be related both to sintering and to a Fe3+ -> Fe2+ reduction involving limited metal amounts. Partial replacement of Fe ions with Al3+ ions improves the thermal stability of the Fe-containing systems. Upon calcination at 1300 C BaFe6Al6O19 retains a surface area of 5m2/g and shows a good activity in CH4 combustion.