US 10,857,521 B2Granted

Diesel oxidation catalyst

AssigneeBASF SE

InventorsShiang Sung, Patrick William McCanty, Stanley A. Roth, Xiaolai Zheng, Olga Gerlach, Markus Kögel

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Abstract

An oxidation catalyst composite, methods, and systems for the treatment of exhaust gas emissions from a diesel engine are described. More particularly, described is an oxidation catalyst composite including a first oxidation component comprising a first refractory metal oxide support, palladium (Pd) and platinum (Pt); a NOx storage component comprising one or more of alumina, silica, titania, ceria, or manganese; and a second oxidation component comprising a second refractory metal oxide, a zeolite, and Pt. The oxidation catalyst composite is sulfur tolerant, adsorbs NOx and thermally releases the stored NOx at temperature less than 350° C.

Claims19

Dependent claims

An oxidation catalyst composite comprising:

a carrier substrate;
and
a catalytic coating on at least a portion of the carrier substrate, the catalytic coating including:
a first oxidation component comprising at least one platinum group metal (PGM) and a first refractory metal oxide, wherein the first oxidation component is substantially free of zeolite;
a NOx storage component comprising one or more of alumina, silica, titania, ceria, and manganese;
and
a second oxidation component comprising a second refractory metal oxide, a zeolite, and at least one PGM,
wherein the first oxidation component is in an under layer on the carrier substrate, the NOx storage component is in a middle layer on the under layer, and the second oxidation component is in an upper layer on the middle layer.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/548,657Filed 8 Feb 2016 · us provisional application
Priority: 9 Feb 2015
Published: US 2018/0029016 A11 Feb 2018
Granted: 8 Dec 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification59 codes

B01J 23/6562
Manganese, technetium or rhenium: manganese
B01D 53/9418
Processes characterised by a specific catalyst: for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a…
B01D 53/944
By catalytic processes: simultaneously removing carbon monoxide, hydrocarbons or carbon making use of oxidation catalysts
B01J 23/002
Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00: mixed oxides other than spinels, e.g. perovskite