公开(公告)号：US20230219039A1

公开(公告)日：2023-07-13

申请号：US17999216

申请日：2021-06-11

Applicant: BASF CORPORATION

Inventor： Robert DORNER ,  Ansgar WILLE ,  Tobias PAUL

IPC: B01D53/94 ,  B01J29/76 ,  B01J23/44 ,  B01J23/42 ,  B01J21/06 ,  B01J21/04 ,  B01J35/00 ,  B01J37/02 ,  B01J37/08 ,  F01N3/10 ,  F01N3/20 ,  F01N3/28

CPC classification number: B01D53/9477 ,  B01D53/944 ,  B01D53/9418 ,  B01D53/9436 ,  B01D53/9468 ,  B01J21/04 ,  B01J21/063 ,  B01J21/066 ,  B01J23/42 ,  B01J23/44 ,  B01J29/763 ,  B01J35/0006 ,  B01J35/0066 ,  B01J37/088 ,  B01J37/0228 ,  B01J37/0236 ,  B01J37/0244 ,  F01N3/103 ,  F01N3/2066 ,  F01N3/2828 ,  B01D2251/208 ,  B01D2251/2062 ,  B01D2255/50 ,  B01D2255/1021 ,  B01D2255/1023 ,  B01D2255/2092 ,  B01D2255/9032 ,  B01D2255/20707 ,  B01D2255/20715 ,  B01D2255/20738 ,  B01D2255/20761 ,  F01N2370/04 ,  F01N2610/03

Abstract: The present invention relates to an exhaust gas treatment system for treating exhaust gas from a lean burn combustion engine, wherein said exhaust gas comprises hydrocarbons and NOx, the exhaust gas treatment system comprising: (i) a means for injecting hydrocarbons into an exhaust gas stream; (ii) a diesel oxidation catalyst (DOC) comprising a substrate and a catalyst coating provided on the substrate, wherein the catalyst coating comprises one or more platinum group metals, wherein the one or more platinum group metals comprise platinum; (iii) a means for injecting a nitrogenous reducing agent into an exhaust gas stream; and (iv) a multifunctional catalyst (MFC) comprising an oxidation catalyst, and a selective catalytic reduction (SCR) catalyst for the selective catalytic reduction of NOx, wherein the MFC comprises a substrate and a catalyst coating provided on the substrate, wherein the catalyst coating comprises the oxidation catalyst and the SCR catalyst, wherein the oxidation catalyst comprises one or more platinum group metals, wherein the one or more platinum group metals comprise palladium and/or platinum, and wherein the SCR catalyst comprises a zeolitic material loaded with copper and/or iron; wherein the means for injecting hydrocarbons, the DOC, the means for injecting a nitrogenous reducing agent, and the MFC are located in sequential order in a conduit for exhaust gas, wherein the means for injecting hydrocarbons into an exhaust gas stream is located upstream of the DOC, wherein the DOC is located upstream of the MFC, and wherein the means for injecting a nitrogenous reducing agent into the exhaust gas stream is located between the DOC and the MFC. Furthermore, the present invention relates to a method for the treatment of exhaust gas using the exhaust gas treatment system according to the present invention, and to a method for the preparation of an exhaust gas treatment system according to the present invention.