| http://www.w3.org/ns/prov#value | - It is also asserted that promoters including alkali metals can be added to the catalysts. [0030] U.S. 5,567,839 relates to palladium/gold shell type catalysts for vinyl acetate production in which a barium salt is used to precipitate water-insoluble palladium and optional gold compounds onto a support prior to reduction with a reducing agent. [0031] U.S. 6,468,496 relates to a supported gold-conta
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