Copper aluminate catalysts for abatement of NO with propylene or ammonia in presence of excess oxygen

To abate NO in exhaust, a series of copper-aluminate catalysts were prepare d by calcination at high temperature with high surface area support. Variab les were Cu loadings and calcination temperatures. Characterization results show that a copper aluminate phase is formed with spinel type structure th rough high calcination temperature and copper lending. The activity and sta bility for NO reduction were studied in a lab. scale reactor in the presenc e of excess oxygen. The reducing agent was C3H6 or NH3. The catalyst, calci ned at high temperature showed enhanced activity in the presence of C3H6, b ut copper aluminate species, formed hy calcination at high temperature, hav e no effect on NO conversion when NH3 is used as the reducing agent. Engine dynamometer test showed that C3H6 is more effective than C2H5OH to abate n itric oxide with 10 wt.% copper loaded aluminate catalysts.