SCR SCR CATALYSTS HAVING IMPROVED LOW TEMPERATURE PERFORMANCE AND METHODS OF MAKING AND USING THE SAME

摘要

A molecular sieve, at least one species of the ionic iron to form a mixture and combined with at least one organic compound, and then the mixture was removed at least one organic compound in the calcined SCR- Active ingredients are manufactured based catalyst itself. The process is iron that is not treated with an organic compound to improve the dispersion of the iron contained in the molecular sieve as compared to the molecular sieve. Iron-containing ferrierite zeolite shows the selective catalytic reduction of nitrogen oxides due to aging or exposure to water vapor before, NH ₃ or an element of transition greater than 25% at 300 ℃ in the exhaust gas. Iron-containing beta-zeolite is 10% H ₂ after aging for 20 hours at 700 ℃ in the presence of O in the exhaust gas (a) from 300 ℃ 40% excess of transition and (b) at 400 ℃ 80% excess conversion, NH ₃ or it represents the selective catalytic reduction of nitrogen oxides by the element.