Exhaust gas purifying catalyst
AssigneeToyota Jidosha Kabushiki Kaisha
InventorHiromasa Suzuki
Life of this patent
Estimating the term…
Abstract
In a three-way catalyst for purifying exhaust gases from internal combustion engines, scattering of bismuth components can be suppressed by employing a Bi—Ti composite oxide at a predetermined ratio. Accordingly, the effect of suppressing hydrogen sulfide emissions can be retained for a long time. This catalyst comprises a support substrate, and a catalyst layer formed on the support substrate and including a noble metal, a porous oxide, and a Bi—Ti composite oxide, and satisfies 0.3≦R≦1.5, where R is the molar ratio of the Bi content to the Ti content per unit volume of the support substrate.
Claims4
An exhaust gas purifying catalyst, comprising:
- a support substrate;
- and
- a catalyst layer formed on said support substrate and including a noble metal, a porous oxide, and a bismuth and titanium composite oxide,
- the ratio R of the molar amount of bismuth loaded per unit volume of said support substrate to the molar amount of titanium loaded per unit volume of said support substrate satisfying 0.3≦R≦1.5.
Dependencies are inferred from the claim text.