Patent ID: 6936564
Filing Date: 2005-08-30
Classification: B01J,C01B,C07B,C07C,C23C

Abstract:
1. A supported platinum group metal catalyst obtained by controlled electroless deposition of at least one platinum group metal from a deposition solution which comprises i) at least one homogeneously dissolved platinum group metal compound, ii) a reducing agents, and iii) at least one control agent selected from the group consisting of an isopolyacid of niobium, an isopolyacid of tantalum, an isopolyacid of molybdenum, an isopolyacid of tungsten, an isopolyacid of vanadium, a salt of an isopolyacid of niobium, a salt of an isopolyacid of tantalum, a salt of an isopolyacid of molybdenum, a salt of an isopolyacid of tungsten, a salt of an isopolyacid of vanadium, a heteropolyacid of niobium, a heteropolyacid of tantalum, a heteropolyacid of molybdenum, a heteropolyacid of tungsten, a heteropolyacid of vanadium, a salt of a heteropolyacid of niobium, a salt of a heteropolyacid of tantalum, a salt of a heteropolyacid of molybdenum, a salt of a heteropolyacid of tungsten, a salt of a heteropolyacid of vanadium and mixtures thereof, thereby obtaining said supported platinum group metal catalyst, wherein the elements on which said control agent is based are detected in the catalyst only in negligible amounts.