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Systems Utilizing Non-Zeolitic Metal-Containing Molecular Sieves Having The CHA Crystal Structure

  • US 20110300028A1
  • Filed: 08/22/2011
  • Published: 12/08/2011
  • Est. Priority Date: 01/31/2008
  • Status: Active Grant
First Claim
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1. An emission treatment system for treatment of an exhaust gas stream comprising NOx and particulate matter, the emission treatment system comprising:

  • a SCR catalyst substrate containing a catalyst comprising a Cu-loaded non-zeolitic molecular sieve having a CHA crystal structure and a Cu loading so that the catalyst is effective to selectively reduce nitrogen oxides with ammonia in the presence of oxygen and ammonia in an exhaust gas stream at 200°

    C. when the catalyst has been deposited on a honeycomb substrate having a cell density of 400 cpsi at target a loading between about 2 and 2.5 g/in3 and tested at a space velocity of 80,000 hr

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    where the feed stream is a mixture of 10% O2, 5% H2O, 500 ppm NO, and 500 ppm NH3 to provide at least about 70% NOx conversion; and

    an ammonia injector or an ammonia-precursor injector positioned upstream of the SCR catalyst substrate for injecting ammonia or an ammonia-precursor.

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