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US 11,033,858 B2Granted
Combined soot filter and urea hydrolysis
AssigneeUmicore AG & Co. KG
InventorPaer Gabrielsson
Life of this patent
Estimating the term…
Abstract
A monolith filter unit for exhaust gas cleaning combines urea hydrolysis with particle filtering.
Claims21
A catalyst impregnated exhaust gas particulate filter unit for vehicle exhaust gas, the unit comprises
- at least one monolith comprising a plurality of channels open at one end and closed at the other end,
- a first open end, and
- a second open end,
- wherein the at least one monolith is divided in two sections, a first section which is not coated or which is coated with a first type of catalyst and a second section which is coated with a second type of catalyst, and
- wherein the filter unit has a cylindrical shape and the first section has the shape of a sector or segment of a circle when seen in a cross sectional view of the filter unit.
2 more elements
A catalyst impregnated exhaust gas particulate filter unit for vehicle exhaust gas, the unit comprises
- at least one monolith comprising a plurality of channels open at one end and closed at the other end,
- a first open end, and
- a second open end,
- wherein the at least one monolith is divided in two sections, a first section which is not coated or which is coated with a first type of catalyst and a second section which is coated with a second type of catalyst, and
- wherein the unit further comprises a flow guide upstream the first section adapted to guide a part of the exhaust gas stream only to the first section and isolate this part of the exhaust gas stream from the rest of the exhaust gas stream.
2 more elements
A catalyst impregnated exhaust gas particulate filter unit for vehicle exhaust gas, the unit comprises
- at least one monolith comprising a plurality of channels open at one end and closed at the other end,
- a first open end, and
- a second open end,
- wherein the at least one monolith is divided in two sections, a first section which is not coated or which is coated with a first type of catalyst and a second section which is coated with a second type of catalyst, and
- wherein the filter unit further comprises a mixer arranged downstream the first and second section adapted to mix the exhaust gas stream from the first section with the exhaust gas stream from the second section.
2 more elements
A process for vehicle exhaust gas cleaning comprising the steps of
- providing a catalyst impregnated exhaust gas particulate filter unit for vehicle exhaust gas comprising at least one monolith comprising a plurality of channels open at one end and closed at the other end, a first open end, a second open end, at least one wall adapted to fit around said at least one monolith, wherein the at least one monolith is divided in two sections, a first section which is not coated or which is coated with a first type of catalyst and a second section which is coated with a second type of catalyst,
- providing a vehicle exhaust gas upstream the first open end of the unit,
- injecting urea into a partial stream of the vehicle exhaust gas, upstream the first section of the at least one monolith, and
- providing a fluid guide upstream the first section of the at least one monolith for the partial stream, adapted to guide the partial stream to the first section of the at least one monolith.
1 more element
A process for vehicle exhaust gas cleaning comprising the steps of
- providing a catalyst impregnated exhaust gas particulate filter unit for vehicle exhaust gas comprising at least one monolith comprising a plurality of channels open at one end and closed at the other end, a first open end, a second open end, at least one wall adapted to fit around said at least one monolith, wherein the at least one monolith is divided in two sections, a first section which is not coated or which is coated with a first type of catalyst and a second section which is coated with a second type of catalyst,
- providing a vehicle exhaust gas upstream the first open end of the unit,
- injecting urea into a partial stream of the vehicle exhaust gas, upstream the first section of the at least one monolith, and
- providing a mixer downstream the filter unit and mixing the flow of fluids comprising NO2 and NH3 exiting the first and the second section of the filter unit.
1 more element
Dependencies are inferred from the claim text.