New three-way catalysts with PT, RH and PD, each supported on a seperate support

摘要

New catalysts for catalytic convertion of CO, light hydrocarbons and nitrogen oxides comprising a 1-layer/3-parts catalyst and/or a 3-layer catalyst, where Rh is supported on W⁶⁺-doped-TiO₂, Pd supported on Y₂O₃-doped-ZrO₂ and Pt supported on SiO₂ or γ-Al₂O₃ or Y₂O₃-doped-ZrO₂, were found to be significantly more active and durable than the known commercial ones.;The new catalysts require smaller quantities of PGM in order to achieve the same activity as known ones and, in addition, present longer lifetime. They may be used for example for automobile emission control and/or for the treatment of industrial and power generation stations emissions.