The material zeolu00edtico ofretita (off) and / or erionita (ERI), ZSM - 34 containing copper, catalyst, process for the preparation of the same, use of the catalyst, exhaust gas treatment system and method for selectively reducing nitrogen oxides NOx

摘要

The material zeolu00edtico ofretita (off) and / or erionita (ERI), ZSM - 34 containing copper, catalyst, process for the preparation of the same, use of catalyst system for the treatment of exhaust gas, and method for selectively reducing nitrogen oxides NOx.The present invention relates to a material zeolu00edtico of ofretita (off) and / or erionita (ERI), ZSM - 34 containing copper having a molar ratio of silica to alumina of from about 4 to about 50 and a content of copper, reported as Cuo, a band from about 1 to about 10% by weight based on the total weight of the material zeolu00edtico calcined.And having a content of alkali metal, reported as metallic oxide, in a range from about 1.5 to about 12% by weight.