Which outcome occurs in selective catalytic reduction when ammonia slip exceeds recommended threshold?

💡 Explanation

When ammonia slip is excessive, unreacted ammonia combines with sulfur trioxide (SO3) in the exhaust gas forming ammonium bisulfate (ABS) because SCR catalysts promote oxidation of SO2 to SO3. Therefore formation of ammonium bisulfate results, rather than increased NOx conversion, reduced pressure drop or elevated temperatures, all requiring different chemical conditions.

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