Zoned three-way conversion catalyst comprising platinum, palladium and rhodium

• Main Authors: SONG XIANG, RIVIDARAN PADMAVATHI, LI YUEJIN, ZHENG XIAOLAI, SUN YIPENG, TRAN, PHONG, DOMBYA KEVIN, JI CHUNXIN, JOHNSON SIMON
• Format: Patent
• Language: Chinese; English
• Published: 26.04.2024
• Subjects: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; THEIR RELEVANT APPARATUS; TRANSPORTING

The present invention provides a catalytic article comprising: a substrate; a bottom carrier coating deposited on the substrate; and a top washcoat deposited on the undercoat layer, where the undercoat layer includes a zoned configuration where the zoned configuration includes a first zone comprising palladium supported on a ceria-zirconia mixed oxide or alumina or both, and a second zone comprising palladium supported on a ceria-zirconia mixed oxide or alumina or both. Wherein the second zone comprises platinum supported on a ceria-alumina composite, and wherein the top washcoat comprises rhodium supported on alumina or a ceria-alumina composite. The invention also provides a method for preparing the catalytic article, and its use for purifying a gaseous exhaust stream. 本发明提供了一种催化制品，该催化制品包括：基材；沉积在该基材上的底部载体涂料；以及沉积在底涂层上的顶部载体涂料，其中该底部载体涂料包括分区构造，其中该分区构造包括第一区和第二区，其中该第一区包含负载在二氧化铈-氧化锆混合氧化物或氧化铝或两者上的钯，其中该第二区包含负载在二氧化铈-氧化铝复合材料上的铂，其中该顶部载体涂料包含负载在氧化铝或二氧化铈-氧化铝复合材料上的铑。本发明还提供了一种用于制备该催化制品的方法，及其用于纯化气态排出流的用途。