Exhaust gas treatment catalyst
    5.
    发明授权
    Exhaust gas treatment catalyst 有权
    废气处理催化剂

    公开(公告)号:US07374729B2

    公开(公告)日:2008-05-20

    申请号:US10812542

    申请日:2004-03-30

    摘要: Provided are an exhaust treatment catalyst and an exhaust article containing the catalyst. The catalyst comprises: (a) a carrier; (b) a first layer deposited on the carrier, said first layer comprising substantially only at least one refractive metal oxide; (c) a second layer deposited on the first layer, said second layer comprising substantially only at least one oxygen storage component and at least one binder therefor; and (d) a third layer deposited on the second layer, said third layer comprising at least one layer of one or more platinum group metal components supported on a refractory metal oxide support. Optionally, a fourth layer is deposited on the third layer wherein the fourth layer comprises one or more platinum group metal components supported on a refractory metal oxide support. As a further option, an overcoat layer may be deposited on the third or fourth layer wherein the overcoat layer comprises a catalyst poison sorbent. Also provided are methods for preparing the catalyst and methods for monitoring the exhaust storage capacity of an exhaust article containing the catalyst.

    摘要翻译: 提供了含有催化剂的废气处理催化剂和排气制品。 催化剂包括:(a)载体; (b)沉积在载体上的第一层,所述第一层基本上仅包含至少一种折射金属氧化物; (c)沉积在第一层上的第二层,所述第二层基本上仅包含至少一个储氧部件和至少一个粘合剂; 和(d)沉积在第二层上的第三层,所述第三层包含负载在难熔金属氧化物载体上的至少一层一种或多种铂族金属组分。 任选地,第四层沉积在第三层上,其中第四层包含负载在难熔金属氧化物载体上的一种或多种铂族金属组分。 作为另外的选择,外涂层可沉积在第三层或第四层上,其中外涂层包含催化剂毒物吸附剂。 还提供了制备催化剂的方法和用于监测含有催化剂的排气制品的排气存储容量的方法。