Lean-burn NOx Reduction by Propene over Gold Supported on Alumina Catalysts Derived from the Sol-Gel Method

Gold supported on alumina catalysts were investigated for selective NOx reduction by propene. Two types of alumina, commercial and sol-gel alumina, were employed. The catalytic performance was mainly studied over the impregnated sol-gel alumina catalyst. The catalytic activity was tested under various propene and oxygen concentrations. NOx conversion and the activity window of the catalysts increased as the propene or oxygen concentration increased. The presence of water also enhanced the NOx conversion and widened the activity window of the catalysts. The sol-gel alumina supported catalysts gave much higher activity than the commercial alumina supported catalysts. Graphical Abstract Catalytic activity of gold supported on alumina prepared from various techniques. [graphic removed]