| http://www.w3.org/ns/prov#value | - t selected from the f block lanthanides or Be, Mg, Ca, Sr, Ba; B is an element selected from the group consisting of Al, Ga, In or mixtures thereof; and B' and B are different elements and are independently selected from the group of elements Mg or the d-block transition elements; (b) passing said oxygen-containing gas in contact with said membrane in said reduction zone to reduce oxygen therein
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