Methods and systems for oxidizing nitric oxide in a gas stream
AssigneeGM Global Technology Operations LLC
InventorsSteven J. Schmieg, Chang H Kim, Gongshin Qi, Wei Li, David B. Brown
Life of this patent
Estimating the term…
Abstract
An after-treatment system architecture and method for oxidizing the nitric oxide component of a gas stream are disclosed. One embodiment may include treatment of a gas stream that includes NOx with a perovskite catalyst of the general formula ABO3 or a modified formula of ABO3 wherein a small amount of a promoter material is substituted for a portion of at least one of element A or element B in a catalytic oxidation reaction to oxidize nitric oxide in the gas stream.
Claims23
A catalytic oxidation reactor, for oxidizing the nitric oxide component of a gas stream, the catalytic oxidation reactor comprising a perovskite catalyst having the general formula ABB′O3,
- wherein A comprises a rare earth metal from the Lanthanide Series and/or alkaline-earth metal;
- wherein B comprises a transition metal;
- and
- wherein B comprises a substitution of a promoter material for a portion of B.
A catalytic oxidation reactor, for oxidizing, the nitric oxide component of a gas stream, the catalytic oxidation reactor comprising a perovskite catalyst having the general formula AA′BO3,
- wherein A comprises a rare earth metal from the Lanthanide Series and/or an alkaline-earth metal;
- wherein B comprises a transition metal;
- wherein A′ comprises a substitution of a promoter material for a portion of A;
- and
- wherein A′ comprises Strontium.
A system for reducing NOx and particulate matter emissions in an exhaust stream comprising:
- catalytic oxidation reactor comprising a substrate material having a first portion and a second portion, said first portion being coupled to a first coating comprising a perovskite catalyst having the general formula AA′BO3 or ABB′O3, wherein A comprises a rare each meta from the Lanthanide Series and/or an alkaline-earth metal, A′ comprises Strontium as a promoter material and a substitution for a portion of A, B′ comprises a substitution of a promoter material for a portion of B, and wherein B comprises a transition metal;
- a particulate filter;
- a catalytic reduction reactor having a selective catalytic reduction catalyst.
A method for oxidizing nitric oxide in a gas stream from hydrocarbon fueled power source operated with a fuel lean combustion mixture, the method comprising:
- passing the gas stream through a catalytic oxidation reactor, the catalytic oxidation reactor comprising a perovskite catalyst of the general formula AA′BO3 or ABB′O3, wherein A comprises a rare earth metal from the Lanthanide Series and/or an alkaline-earth metal, A′ comprises Strontium as a promoter material and a substitution for a portion of A, B′ comprises a substitution of a promoter material for a portion of B and wherein B comprises a transition metal.
Dependencies are inferred from the claim text.