| http://www.w3.org/ns/prov#value | - The refractory inorganic oxide having the platinum group elements consequently supported thereon is supplied together either with remainder of the refractory inorganic oxide having no platinum group element supported thereon and a cerium-zirconium mixed oxide or with the cerium-zirconium mixed oxide to a pulverizing device such as a ball mill and wet pulverized therein to prepare a slurry.
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