Hydrothermally stable catalyst for improved lean NOx reduction
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United States of America Patent
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Nov 11, 2003
Grant Date -
Apr 24, 2003
app pub date -
Oct 18, 2001
filing date -
Oct 18, 2001
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Abstract
Certain metal-exchanged SUZ-4 zeolites have been prepared that have catalytic activity for the reduction of NOx in the exhaust of a hydrocarbon or alcohol fueled engine operated under fuel lean conditions. Initially the SUZ-4 zeolite contains alkali metal cations such as Li.sup.+, Na.sup.+, K.sup.+ and/or Cs.sup.+. These alkali metal cation-containing zeolites are partially exchanged with at least one of copper (II), silver (I), iron (III) or cobalt (II) ions. The resulting partially exchanged SUZ-4 zeolites display such activity and are stable under extreme hydrothermal aging conditions.
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