| abstract |
The present invention has a copper content reported as CuO, ranging from about 1 to about 10 weight percent based on the silica to alumina molar ratio in the range of about 4 to about 50 and the total weight of the calcined zeolite material, and from about 0.7 to about 1.5 weight Copper containing ZSM-34 having a reported alkali metal content as metal oxide in the% range, offreite (OFF) and / or erionite (ERI) zeolite material, 750 ° C. aged copper containing ZSM-34, OFF and / or ERI zeolitic material was mixed in a gas mixture of 500 ppm NO, 500 ppm NH 3 , 10% O 2 , 5% H 2 O and the remaining N 2 at a volumetric gas construction rate of 30000 h −1 . Copper containing ZSM-34, OFFET and / or Ery, exhibiting NO conversion of at least about 75% at 200 ° C. and at least about 90% at 450 ° C. measured under steady state conditions under maximum NH 3 -slip conditions. Onite (ERI) zeolite material. |