Abstract
Data on the physico-chemical characterization and on the catalytic activity in CH4combustion of BaFe12O19and BaFexAl(12−x)O19samples (x=1, 3, 6, 9) are reported. BaFe12O19shows good catalytic activity in CH4combustion, 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 BaFe6Al6O19retains a surface area of 5 m2/g and shows a good activity in CH4combustion.
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