| 摘要 |
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.
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