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US 7,402,292 B2Granted
Device and methods of ammonia generation for NOx abatement
AssigneeDelphi Technologies, Inc.
InventorsMark D. Hemingway, William J. LaBarge, Haskell Simpkins
Life of this patent
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Abstract
One embodiment of a method of operating a NOx abatement system comprises: introducing an exhaust stream to an ammonia generator in a normal flow direction, adsorbing NOx from the exhaust stream in the ammonia generator, diverting the exhaust stream around the ammonia generator, introducing hydrogen to the ammonia generator in a direction opposite the normal flow direction, and generating ammonia within the ammonia generator.
Claims20
An ammonia generator, comprising:
- a shell;
- and
- a catalyst bed housed within said shell;
- wherein said catalyst bed comprises a substrate and a catalyst,
- wherein said catalyst comprises a catalytic metal capable of reacting NOx and hydrogen to form ammonia, and a material capable of adsorbing NOx;
- wherein said catalytic metal comprises about 100 g/ft3 to about 260 g/ft3 ruthenium, and about 10 g/ft3 to about 50 g/ft3 to platinum.
3 more elements
A NOx abatement system, comprising:
- an ammonia generator comprising an inlet end and an outlet end
- an exhaust conduit connected in fluid communication to said inlet end;
- a mixture conduit connected in fluid communication to said outlet end;
- a by-pass circuit connected in fluid communication to said exhaust conduit on a first end and connected in fluid communication to said mixture conduit on a second end;
- a reformer connected to said mixture conduit;
- and,
- a valve capable of directing and inhibiting a flow of fluids, wherein said valve is disposed in said mixture conduit at a position capable of inhibiting flow of a fluid stream from said by-pass circuit into said ammonia generator and capable of directing reformate from said reformer into said ammonia generator.
4 more elements
A method of operating a NOx abatement system, comprising:
- introducing an exhaust stream to an ammonia generator in a normal flow direction;
- adsorbing NOx from said exhaust stream in said ammonia generator;
- diverting said exhaust stream around said ammonia generator;
- introducing hydrogen to said ammonia generator in a direction opposite said normal flow direction;
- and
- generating ammonia within said ammonia generator.
3 more elements
Dependencies are inferred from the claim text.