Patent Number: 6,251,820

Title: Catalyst for purifying exhaust gas and process for producing the same

Abstract: A catalyst for purifying an exhaust gas includes amorphous and homogeneous composite oxide particles, a catalytic noble metal element, and metallic oxide particles. The metallic oxide particles interpose among the composite oxide particles to connect them with each other at least. The catalyst has good heat resistance, sulfur-poisoning resistance, and durability. The catalyst is produced as follows. A slurry is prepared by mixing an organosol with a suspension, or by mixing a solution with a suspension. The slurry is deposited on a support substrate to form a coating layer thereon. The suspension includes a precursor powder, and a solvent. The precursor powder includes the composite oxide particles, and the catalytic noble metal element. The composite oxide particles include a support component, and an NO.sub.x storage element. The solvent is free from elution of the NO.sub.x storage element. The organosol includes an organic solvent, and an oxide sol. The solution includes an organic solvent, and an organometallic compound. The oxide sol and organometallic compound includes aluminum, silicon or zirconium.

Inventors: Tsuji; Shinji (Okazaki, JP)

Assignee: Toyota Jidosha Kabushiki Kaisha

International Classification: B01D 53/94 (20060101); B01J 23/58 (20060101); B01J 23/63 (20060101); B01J 23/54 (20060101); B01J 37/00 (20060101); B01J 37/02 (20060101); B01J 023/00 (); B01J 021/08 (); B01J 021/12 (); B01J 021/14 ()

Expiration Date: 06/26/2018