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AssigneeBASF SE
InventorsJeff H. Yang, Wen-Mei Xue, Stanley A. Roth, Kenneth E. Voss, Qi Fu, Subramanian Prasad, Barbara K. Slawski, Jaya L. Mohanan, Sandip D. Shah
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Certain selective catalytic reduction (SCR) articles, systems and methods provide for high NOx conversion while at the same time low N2O formation. The articles, systems and methods are suitable for instance for the treatment of exhaust gas of diesel engines. Certain articles have zoned coatings disposed thereon, for example, a zoned coating comprising an upstream zone comprising a coating layer comprising a steam-activated iron-containing molecular sieve and a downstream zone comprising a coating layer comprising a high copper-containing molecular sieve.
A method for activating an iron-containing molecular sieve powder, the method comprising:
A selective catalytic reduction article comprising a substrate having a front upstream end and a rear downstream end defining an axial length and having a catalytic coating thereon, where the catalytic coating comprises:
A selective catalytic reduction system comprising:
26-27. (canceled)
Dependencies are inferred from the claim text.