The Effects of Different Preparation Conditions of IR Catalyst on the Simultaneous Removal of Soot and NOx in the Presence of Rich Oxygen and H<sub>2</sub>O as Well as SO<sub>2</sub>

A series of Ir-supported catalysts were prepared by incipient impregnation method. The activity of Ir catalyst for the simultaneous removal of soot and NOx in the presence of rich-oxygen and H 2 O as well as SO 2 has been studied, and the effects of calcination temperature, calcination time, calcination atmosphere, loading, carrier and precursor on its catalytic performance has also been investigated. Ir catalyst exhibits a high activity. With the calcination temperature increasing, Ir catalytic activity increases firstly and then decreases, and the optimal calcination temperature is 900°C. With the calcination time prolonged, Ir catalytic activity also increases firstly and then decreases, and the optimal calcination time is 3h. The optimal calcination atmosphere is 1.5vol.% H 2 /N 2 . Support material and precursor have a little effect on the catalytic activity, and the order is Ir/TiO 2 > Ir/ZrO 2 > Ir/SiO 2 > Ir/Al 2 O 3 > Ir/ZSM-5 and IrCl (CO)[P(C 6 H 5 ) 3 ] 2 /ZrO 2 > H 2 IrCl 6 ·6H 2 O/ZrO 2 > IrCl 4 ·4H 2 O/ZrO 2 .