Patent ID: 6210649
Filing Date: 2001-04-03
Classification: B01D,B01J

Abstract:
A method comprising:exposing an NO.sub.x compound to a ceramic, the ceramic under conditions such that NO.sub.x reduction occurs, having a surface area of at least 10 m.sup.2 /g, the ceramic comprising an agglomerate of crystals having a mean crystallite size of less than 20 nm, the ceramic being selected from the group consisting of Sc.sub.2 O.sub.3, Y.sub.2 O.sub.3, La.sub.2 O.sub.3, Gd.sub.2 O.sub.3, Eu.sub.2 O.sub.3, Dy.sub.2 O.sub.3, Sm.sub.2 O.sub.3, and Lu.sub.2 O.sub.3, and doped Sc.sub.2 O.sub.3, Y.sub.2 O.sub.3, La.sub.2 O.sub.3, Gd.sub.2 O.sub.3, Eu.sub.2 O.sub.3, Dy.sub.2 O.sub.3, Sm.sub.2 O.sub.3, and Lu.sub.2 O.sub.3.