Zeolite catalyst and preparation process for NOx reduction

A catalyst prepared by:

• providing a zeolite carrier having a silicon/aluminum mole ratio of from about 14 to about 30;
• providing a cupric salt aqueous solution having a concentration of from about 0.001 molar to about 10 molar;
• defining a copper zeolite catalyst by carrying out an ion exchange reaction between copper ions and said zeolite carrier in said cupric salt aqueous solution at a temperature of from about 4° C. to about 25° C.;
• and
• calcinating said copper zeolite catalyst at a temperature of from about 300° C. to about 700° C.

A process for preparing a catalyst, comprising the steps of:

• providing a zeolite carrier;
• providing a cupric salt aqueous solution;
• defining a copper zeolite catalyst by carrying out an ion exchange reaction between copper ions and said zeolite carrier in said cupric salt aqueous solution at a temperature of from about 4° C. to about 25° C.;
• and
• calcinating said copper zeolite catalyst.

A process for removing nitrogen oxides from a gaseous medium, comprising the steps of:

• providing a catalyst prepared by providing a cupric salt aqeous solution, providing a zeolite carrier, and causing an ion exchange reaction between copper ions and said zeolite carrier in said cupric salt aqueous solution at a temperature of from about 4° C. to about 25° C.;
• defining a gaseous mixture by providing a reducing agent and mixing said reducing agent with said gaseous medium;
• and
• passing said gaseous mixture through said catalyst.