| 摘要 |
Disclosed herein are NOx reduction catalysts, particulate filters, exhaust treatment systems, and methods of treating a gas stream. In one embodiment, a NOx reduction catalyst comprises Ce<SUB>a</SUB>-Zr<SUB>b</SUB>-R<SUB>c</SUB>-A<SUB>d</SUB>-M<SUB>e</SUB>-O<SUB>x</SUB>. "R" is W and/or Mn. If "R" is W, "A" is selected from the group consisting of Mo, Ta, Nb, and combinations comprising at least one of the foregoing "A", and if "R" is Mn, A is selected from the group consisting of W, Mo, Ta, Nb, and combinations comprising at least one of the foregoing "A". "M" is a trivalent rare earth ion. a+b+c+d+e=1. "a" is about 0.1 to about 0.6; "b" is about 0.25 to about 0.7; "c" is about 0.02 to about 0.5; and if "R" is Mn, "d" is about 0.04 to about 0.2, and if "R" is W, "d" is less than or equal to about 0.2; while "e" is less than or equal to about 0.15. The NOx reduction catalyst is capable of reducing NOx.
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