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A zeolite catalyst and a process for preparing a zeolite catalyst which is both capable of catalyzing the removal of nitrogen oxides from a gaseous medium across a broad temperature range and is operationally and hydrothermally stable at high reaction temperatures. The zeolite catalyst includes a z

A zeolite catalyst and a process for preparing a zeolite catalyst which is both capable of catalyzing the removal of nitrogen oxides from a gaseous medium across a broad temperature range and is operationally and hydrothermally stable at high reaction temperatures. The zeolite catalyst includes a zeolite carrier having a mole ratio of typically from about 14 to about 95 and copper ions supported on the zeolite carrier. The zeolite catalyst is prepared by providing a zeolite carrier, reacting copper with the zeolite carrier by carrying out an ion exchange reaction in a cupric salt aqueous solution at a temperature of between about 4째 C. and room temperature (25째 C.), and then drying and calcining the catalyst.

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What is claimed is: 1. A process for preparing a catalyst, comprising the steps of: providing a zeolite carrier having a silicon/aluminum mole ratio of from about 14 to about 95; providing a cupric salt aqueous solution; defining a copper zeolite catalyst by carrying out an ion exchange reaction be

What is claimed is: 1. A process for preparing a catalyst, comprising the steps of: providing a zeolite carrier having a silicon/aluminum mole ratio of from about 14 to about 95; 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 4째 C. to about 14째 C.; and calcinating said copper zeolite catalyst. 2. The process of claim 1 wherein said copper zeolite catalyst comprises a copper content of from about 0.1% to about 10.0% by weight. 3. The process of claim 1 wherein said calcining said copper zeolite catalyst comprises calcining said copper zeolite catalyst at a temperature of from about 300째 C. to about 700째 C. 4. The process of claim 3 wherein said copper zeolite catalyst comprises a copper content of from about 0.1% to about 10.0% by weight. 5. The process of claim 1 wherein said cupric salt aqueous solution is copper sulfate, copper nitrate, copper acetate or copper chloride having a concentration of from about 0.001 molar to about 10 molar. 6. The process of claim 5 wherein said calcining said copper zeolite catalyst comprises calcining said copper zeolite catalyst at a temperature of from about 300째 C. to about 700째 C.