Development of Iridium Catalysts for Selective Reduction of NO with CO

作者：Hamada Hideaki^*; Haneda Masaaki

来源：Journal of the Japan Petroleum Institute, 2012, 55(2): 87-98.

DOI：10.1627/jpi.55.87

• Nitrogen monoxide
• Selective catalytic reduction
• Carbon monoxide
• Iridium catalyst
• Additive effect
• Diesel exhaust

The development of Ir/SiO2-based catalysts for the selective reduction of NO with CO in the presence of O-2 is described in this review paper. The catalytic activity of Ir/SiO2 was promoted considerably by addition of Nb2O5 and WO3 These promoted catalysts showed NO reduction activity even in the absence of SO2, in contrast to In SiO2 catalyst. The addition of Nb2O5 was found to stabilize Ir metal as the active species for NO reduction. Also in the case of WO3, it was concluded that In metal interacting strongly with WO3 (denoted as Ir-WO3) is the catalytic active species. High temperature calcination created preferentially the Ir-WO3 species. The catalytic activity and durability of Ir/WO3/SiO2 was further promoted by addition of Ba. The developed Ba/Ir/WO3/SiO2 catalyst in monolithic form showed good performance for NO reduction for actual diesel exhaust.

• 出版日期2012-3