초록 ▼

A catalyst suitable for use as a three-way catalyst having low H2S emissions for emission control and with substantially no ceria present is made with a refractory oxide particle or powder support having deposited thereon about 0.5-20% by weight of a non-rate earth oxide stabilizer, at least 0.5 to

A catalyst suitable for use as a three-way catalyst having low H2S emissions for emission control and with substantially no ceria present is made with a refractory oxide particle or powder support having deposited thereon about 0.5-20% by weight of a non-rate earth oxide stabilizer, at least 0.5 to about 5% by weight of an alkali metal oxide as a promoter, and a catalytically-effective amount of one or more platinum group metals. The preferred refractory oxide is alumina and the non-rare earth oxide stabilizer can be an oxide such as ZrO2, MgO, CaO, SnO, CaO, Y2O3, TiO2, ZnO, B2O3, P2O5, SnO2, Bi2O3, or SiO2 with the preferred oxide being zirconia.

대표청구항 ▼

A catalyst suitable for use as a three-way catalyst having low H2S emissions for emission control with no substantial amount of ceria or nickel present comprising a formed refractory oxide particle or refractory oxide powder support having a B.E.T. surface area of 50-250 m2g and having directly depo

A catalyst suitable for use as a three-way catalyst having low H2S emissions for emission control with no substantial amount of ceria or nickel present comprising a formed refractory oxide particle or refractory oxide powder support having a B.E.T. surface area of 50-250 m2g and having directly deposited thereon about 0.5-20% by weight of a non-rare earth oxide stabilizer selected from the group consisting of ZrO2, MgO, CaO, SrO, BaO, Y2O3, ZnO, B2O3, P2O5, SiO2 and mixtures thereof; at least about 0.5 to about 5% by weight of an alkali metal oxide as a promoter; and having subsequently deposited thereon a catalytically-effective amount of one or more platinum group metals selected from the group of Pt, Pd, Ir, Rh, or mixtures thereof; binary mixtures of Pt-Pd, Pt-Rh, or Pd-Rh; and tertiary mixtures of Pt-Pd-Rh.