The material zeolu00edtico of ofretita (off) and / or erionita (ERI), ZSM - 34 containing copper, the catalyst, the use of a catalyst, exhaust gas treatment system, and method for the selective reduction of nitrogen oxides NOx

摘要

The material zeolu00edtico of ofretita (off) and / or erionita (ERI), ZSM - 34 containing copper, the catalyst, the use of a catalyst, exhaust gas treatment system, and method for the selective reduction of nitrogen oxides NOx.The present invention relates to a material zeolu00edtico of ofreita (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 1 0% 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 0.7 to about 1.5% by weight, in which the material zeolu00edtico of ofretita (off) and / or erionita (ERI), ZSM - 34 containing copper aging 750 198 C shows conversion of the 200 C 198 at least about 75% and 450 198 C or pel The least about 90%.As a space velocity based on hourly volume gas 30000 h under conditions of stable state, in the conditions of suspension of NH ~ 3 ~ maximum, in a gas mixture of 500 ppm, 500 ppm NH ~ 3 ~ 10% of H ~ 2 ~ o, the balance being n.