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Structure and properties of an alumina/amorphous‐alumina/platinum catalytic system deposited on FeCrAl steel

We have investigated the properties and structure of alumina films obtained as a result of thermal oxidation of 0H18J5 steel under a mixture of SO2 and O2 atmosphere and then covered with layers of magnetron‐sputtered alumina and platinum. The catalytic tests and transmission electron microscopy investigations reveal that θ‐Al2O3 films containing acidic and basic sites are distinguished by high catalytic activity, whereas amorphous and α‐Al2O3 films show neutral activity. The platinum films deposited on them contribute to the enrichment of the laminar system with basic sites, and consequently raise the catalytic activity of the system. The investigations performed indicate that the catalytic activity of the system may be tailored to the desired level by the control of the thickness of the individual layers of coating.