Effect of Organics on Activity of Cu/ZSM-5 Catalyst for Selective Reduction of NO with NH₃

Abstract

The effect of co-existing organics on the selective reduction of NO using ammonia as a reducing agent was investigated over Cu/ZSM-5 catalysts. Addition of organics in the feed gas resulted in deactivation of the catalysts. NH₃-SCR activity at 200°C decreased in the following order, acetaldehyde > n-decane > methyl decanoate, p-xylene > m-xylene. After oxidation of the deactivated catalysts in an oxygen flow at 500°C, the activity of the catalyst was recovered. Hence, the cause of the deactivation was considered to be a carbonaceous material deposited over the catalyst.