公开(公告)号：WO2021165658A1

公开(公告)日：2021-08-26

申请号：PCT/GB2021/050361

申请日：2021-02-15

Applicant: JOHNSON MATTHEY PUBLIC LIMITED COMPANY

Inventor： HOTCHKISS, Thomas ,  MARVELL, David ,  TURNER, John ,  WALTON, Mark

IPC: F01N3/021 ,  F01N3/035 ,  B01D46/24 ,  B01D53/94 ,  B01D53/92

Abstract: A method and apparatus (1) for treating a filter (2) for filtering particulate matter from 5 exhaust gas and a treated filter (2) are described. A reservoir (3) containing a dry powder (4) is provided. A vacuum generator (6) establishes a primary gas flow through a porous structure of the filter (2) by applying a pressure reduction to an outlet face of the filter (2). A spray device (7) receives the dry powder (4) from a transport device (8) and sprays the dry powder (4) towards the inlet face of the filter (2). A controller (9) is configured to control 10 operation of at least the vacuum generator (6) and the spray device (7). The dry powder (4) comprises or consists of a metal compound for forming by thermal decomposition a metal oxide.

公开(公告)号：WO2019186485A1

公开(公告)日：2019-10-03

申请号：PCT/IB2019/052596

申请日：2019-03-29

Applicant: JOHNSON MATTHEY PUBLIC LIMITED COMPANY ,  BERGEAL, David

Inventor： BERGEAL, David ,  BROWN, Gavin ,  HOUEL, Valerie ,  WALTON, Mark ,  WIJEMANNE, Thilanka

IPC: F01N3/035 ,  F01N3/10 ,  F01N3/20 ,  F01N13/00

Abstract: Systems and methods of the present invention related to an exhaust gas purification system comprising: (a) a first injector for injecting ammonia or a compound decomposable to ammonia into the exhaust gas; (b) a diesel particulate filter including an inlet and an outlet, wherein the filter includes a selective catalyst reduction (SCR) catalyst and an oxidation catalyst; (c) a second injector for injecting ammonia or a compound decomposable to ammonia into the exhaust gas, located downstream of the filter; and (d) a downstream catalyst comprising a selective catalytic reduction catalyst, located downstream of the second injector.