Catalyst subassembly, device comprising same for purifying exhaust gases from an internal combustion engine, modular system for the subassembly, and method for manufacturing the subassembly
First Claim
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1. A catalyst subassembly for a device for purifying exhaust gases from an internal combustion engine, the catalyst subassembly comprising:
- a common catalyst housing;
a regeneratable particulate filter and an integral SCRF catalyst on the particulate filter for selective reduction of nitrogen oxides, where the common catalyst housing and the SCRF catalyst are usable for a plurality of variants of an internal combustion engine; and
an SCR catalyst for selective reduction of nitrogen oxides, whereinthe SCR catalyst is arranged upstream of the SCRF catalyst,the SCRF catalyst and the SCR catalyst are arranged in the common catalyst housing, andthe SCR catalyst is variably dimensioned depending on a selected engine variant among the plurality of variants of the internal combustion engine, while the common catalyst housing and the SCRF catalyst each are identically dimensioned independently of the selected engine variant.
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Abstract
A catalyst subassembly for a device for purifying exhaust gases from an internal combustion engine, in particular a diesel engine, includes an SCRF catalyst and an SCR catalyst upstream of the SCRF catalyst. The two catalysts are arranged in a common catalyst housing. The catalyst housing, the SCRF catalyst and the SCR catalyst can be selected from a modular system for different variants of the internal combustion engine.
11 Citations
19 Claims
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1. A catalyst subassembly for a device for purifying exhaust gases from an internal combustion engine, the catalyst subassembly comprising:
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a common catalyst housing; a regeneratable particulate filter and an integral SCRF catalyst on the particulate filter for selective reduction of nitrogen oxides, where the common catalyst housing and the SCRF catalyst are usable for a plurality of variants of an internal combustion engine; and an SCR catalyst for selective reduction of nitrogen oxides, wherein the SCR catalyst is arranged upstream of the SCRF catalyst, the SCRF catalyst and the SCR catalyst are arranged in the common catalyst housing, and the SCR catalyst is variably dimensioned depending on a selected engine variant among the plurality of variants of the internal combustion engine, while the common catalyst housing and the SCRF catalyst each are identically dimensioned independently of the selected engine variant. - View Dependent Claims (2, 3, 4, 5)
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6. A modular system for a catalyst subassembly for a device for purifying exhaust gases from an internal combustion engine, the catalyst subassembly comprising a common catalyst housing;
- a regeneratable particulate filter and an integral SCRF catalyst on the particulate filter for selective reduction of nitrogen oxides, where the common catalyst housing and the SCRF catalyst are usable for a plurality of variants of an internal combustion engine; and
an SCR catalyst for selective reduction of nitrogen oxides, wherein the SCR catalyst is arranged upstream of the SCRF catalyst, and the SCRF catalyst and the SCR catalyst are arranged in the common catalyst housing,wherein the modular system comprises; a plurality of the common catalyst housings and a plurality of the SCRF catalysts, where each common catalyst housing and each SCRF catalyst are dimensioned independently of a selected engine variant among the plurality of variants of the internal combustion engine; and a set of different SCR catalysts, where each SCR catalyst is differently dimensioned depending on the selected engine variant. - View Dependent Claims (7, 8, 9, 10, 11, 12)
- a regeneratable particulate filter and an integral SCRF catalyst on the particulate filter for selective reduction of nitrogen oxides, where the common catalyst housing and the SCRF catalyst are usable for a plurality of variants of an internal combustion engine; and
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13. A device for purifying exhaust gases from an internal combustion engine, the device comprising:
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a catalyst subassembly, the catalyst subassembly comprising; a common catalyst housing; a regeneratable particulate filter and an integral SCRF catalyst on the particulate filter for selective reduction of nitrogen oxides, where the common catalyst housing and the SCRF catalyst are usable for a plurality of variants of an internal combustion engine; and an SCR catalyst for selective reduction of nitrogen oxides, wherein the SCR catalyst is arranged upstream of the SCRF catalyst, the SCRF catalyst and the SCR catalyst are arranged in the common catalyst housing, and the SCR catalyst is variably dimensioned depending on a selected engine variant among the plurality of variants of the internal combustion engine, while the common catalyst housing and the SCRF catalyst each are identically dimensioned independently of the selected engine variant. - View Dependent Claims (14, 15, 16, 17)
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18. A method for producing a catalyst subassembly from a modular system for use with a plurality of engine variants of an internal combustion engine, the method comprising the acts of:
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providing a plurality of catalyst housings and a plurality of SCRF catalysts, each catalyst housing and each SCRF catalyst being identically dimensioned independently of a selected engine variant among the plurality of variants of the internal combustion engine; selecting an SCR catalyst from a set of different SCR catalysts, the selected SCR catalyst being variably dimensioned depending on the selected engine variant; and assembling the selected SCR catalyst with the SCRF catalyst in a common catalyst housing to form the catalyst subassembly. - View Dependent Claims (19)
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Specification