| http://www.w3.org/ns/prov#value | - MnO2 (both ??-MnO2 and ??-MnO2), as well as palladium or palladium oxides, Ag2O, or other metal oxides such as aluminum oxides and/or copper oxides can be used as a catalyst and can be applied as a coating on surfaces of the delivery device that are in contact with the airstream.
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