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Emissions Treatment System with Ammonia-Generating and SCR Catalysts

  • US 20140047819A1
  • Filed: 10/04/2013
  • Published: 02/20/2014
  • Est. Priority Date: 04/03/2009
  • Status: Active Grant
First Claim
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1. An emissions treatment system for an exhaust stream of a diesel engine or a lean burn gasoline engine comprising:

  • an in-situ ammonia-generating component; and

    an SCR catalyst disposed downstream of the ammonia-generating component, wherein the SCR catalyst comprises a molecular sieve having the CHA crystal structure, wherein the SCR catalyst is effective to reduce a spike in ammonia during cyclic operation of the engine between lean and rich operation.

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