| http://www.w3.org/ns/prov#value | - platinum supported on such a carrier as alumina, silica or carbon black; platinum-vinylsiloxane complexes {e.g. Pt.sub.n(ViMe.sub.2SiOSiMe.sub.2Vi).sub.n, Pt[(MeViSiO).sub.4].sub.m}; platinum-phosphine complexes {e.g. Pt(PPh.sub.3).sub.4,
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