公开(公告)号：US20240131498A1

公开(公告)日：2024-04-25

申请号：US18277908

申请日：2022-02-18

Applicant: BASF CORPORATION

Inventor： Jia Di Zhang ,  Wen-Mei Xue ,  Xiaofan Yang ,  Weiyong Tang ,  Burcu Bayram ,  Yu Fen Hao

IPC: B01J29/76 ,  B01D53/94 ,  B01J23/42 ,  B01J29/90 ,  B01J35/57 ,  B01J35/61 ,  B01J35/77 ,  B01J37/00 ,  B01J37/02 ,  B01J38/12 ,  F01N3/20 ,  F01N3/28

CPC classification number: B01J29/763 ,  B01D53/9418 ,  B01D53/944 ,  B01J23/42 ,  B01J29/90 ,  B01J35/57 ,  B01J35/612 ,  B01J35/77 ,  B01J37/0036 ,  B01J37/0215 ,  B01J38/12 ,  F01N3/2066 ,  F01N3/2803 ,  B01D2255/1021 ,  B01D2255/20761 ,  B01D2255/50 ,  B01D2255/9155 ,  B01D2257/404 ,  B01D2258/012 ,  B01J2229/186 ,  F01N2370/04

Abstract: The present invention relates to a SCR catalytic article, comprising —a substrate and —a copper-containing small pore zeolite, having a crystal structure characterized by a decrease of unit cell volume upon sulfurization and desulfurization of less than Å3 as determined by an X-ray powder diffraction, wherein the sulfurization and desulfurization are carried out in accordance with the processes as described in the specification, and to an exhaust treatment system comprising the same. The present invention also relates to a method for determining whether a metal-promoted small pore zeolite is resistant to irreversible sulfur poisoning and a method for evaluating whether a metal-promoted small pore zeolite is qualified for resistance to irreversible sulfur poisoning.

公开(公告)号：US20240082765A1

公开(公告)日：2024-03-14

申请号：US18269117

申请日：2021-12-01

Applicant: BASF Corporation

Inventor： Jia Di Zhang ,  Teng Shen ,  Jian Li ,  Wen Ji Song ,  Tobias Paul ,  Martin Kalwei ,  Edgar Viktor Huennekes ,  Weiyong Tang

IPC: B01D39/20

CPC classification number: B01D39/2058 ,  B01D2255/702 ,  B01D2258/01

Abstract: The present invention provides a method for treating a used particulate filter, comprising: removing particulates from the particulate filter; and introducing simulated ash into inlet channels of the particulate filter after removing the particulates.

公开(公告)号：US20220258137A1

公开(公告)日：2022-08-18

申请号：US17626135

申请日：2020-07-09

Applicant: BASF CORPORATION

Inventor： Weiyong Tang ,  Sandip D. Shah ,  Andreas R. Munding ,  Fabien A. Rioult ,  Ramesh Murlidhar Kakwani

IPC: B01J23/44 ,  B01J23/42 ,  B01J21/04 ,  F01N3/20

Abstract: A catalyst article is provided including a substrate including a plurality of passageways, and further including a first and a second oxidation region including a first and a second subset of said plurality of passageways. A first catalyst composition is coating at least a portion of each passageway of the first oxidation region and positioned as a sole PGM-containing catalyst layer, or a zoned portion thereof, or as a top PGM-containing catalyst layer, or a zoned portion thereof, in the first oxidation region. A second catalyst composition is coating at least a portion of each passageway of the second oxidation region and positioned as a sole PGM-containing catalyst layer, or a zoned portion thereof, or as a top PGM-containing catalyst layer, or a zoned portion thereof, in the second oxidation region. The Pt:Pd weight ratio is greater in the first catalyst composition than in the second catalyst composition.

公开(公告)号：US11097264B2

公开(公告)日：2021-08-24

申请号：US16142451

申请日：2018-09-26

Applicant: BASF Corporation

Inventor： Xiaofan Yang ,  Weiyong Tang ,  Ze Zhang

IPC: B01J38/08 ,  B01J29/90 ,  B01J29/76 ,  B01D53/94 ,  B01D53/96 ,  F01N3/20 ,  F01N3/28 ,  B01J38/02 ,  B01J29/072 ,  B01J29/72 ,  B01J29/70 ,  B01J29/06 ,  B01J37/02 ,  F01N3/035 ,  F01N3/10

Abstract: The present invention provides methods for low temperature desulfating sulfur-poisoned SCR catalysts, and emission control systems adapted to apply such desulfating methods, in order to regenerate catalytic NOx conversion activity. The methods are adapted for treating an SCR catalyst to desorb sulfur from the surface of the SCR catalyst and increase NOx conversion activity of the SCR catalyst, the treating step including treating the SCR catalyst with a gaseous stream comprising a reductant for a first treatment time period and at a first treatment temperature, wherein the first treatment temperature is about 350° C. or less, followed by a second treatment time period and a second treatment temperature higher than the first treatment temperature, wherein the molar ratio of reductant to NOx during the treating step is about 1.05:1 or higher.