公开(公告)号：US20230001386A1

公开(公告)日：2023-01-05

申请号：US17756482

申请日：2020-11-26

Applicant: BASF Corporation

Inventor： M Shahjahan KAZI ,  Andreas R. MUNDING ,  David M. YOUNGREN

IPC: B01J23/42 ,  B01J21/06 ,  B01J21/08 ,  B01J35/00 ,  B01J35/04 ,  B01J37/02 ,  B01D53/94 ,  F01N3/28

Abstract: An oxidation catalyst composition is provided, the composition including a plurality of platinum group metal particles having a multi-modal distribution of particle sizes. The plurality of platinum group metal particles includes a first population of platinum group metal particles having a range of particle sizes of from about 0.5 nm to about 3 nm, and a second population of platinum group metal particles having a range of particle sizes of from about 4 nm to about 15 nm. Methods for the preparation and use of the catalyst composition are also provided, as well as catalyst articles and emission gas treatment systems employing such catalyst articles. The catalyst exhibits enhanced stability with respect to oxidation performance after degreening and/or aging, as compared to conventional oxidation catalysts, in particular less loss of NOx oxidation performance.