Patent ID: 7695703

Claim:
A process of selective catalytic reduction of NOx in a combustion exhaust stream comprising: preparing a catalyst by the steps of a) steam treating a zeolite material at about 500° C.-600° C. for about 5-15 hours; b) adding iron to the zeolite material at a loading between 0.01% and 10% iron; and c) calcining the zeolite material at about 750° C.-900° C. for about 1-5 hours; wherein the order of steps a) and b) may vary, followed by step c); mixing 60-82 ppm of ammonia into a combustion exhaust stream at over 500° C.; contacting the combustion exhaust stream at 500° C.-650° C. with the catalyst in a manner necessary to facilitate a reaction between NO and NO 2 in the exhaust stream and the ammonia.