PROCEDURE TO PRODUCE A CATALYST TO PURIFY EXHAUST GASES.

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A catalyst for purifying an exhaust gas comprising a support including rutile type titania, an NO x storage material including at least one element selected from the group consisting of alkali metals, alkaline-earth metals and rare-earth elements and loaded on the support, and a noble metal loaded on the support. Since the rutile type TiO2 and the NO x storage material form a fine composite oxide, the NO x storage material is likely to decompose even when it is subject to the sulfur poisoning, and the NO x storage material easily recovers the NO x storage ability. Therefore, the NO x storage material can be inhibited from the sulfur poisoning, and a high NO x conversion ratio can be maintained even after the service at an elevated temperature.