Catalytic reduction of NO over in situ synthesized Ir/ZSM-5 monoliths

Unique properties of Ir/ZSM-5 catalyst for NO reduction with CO in the presence of excess oxygen

“…1. In our previous paper [12], we have demonstrated that under such feed conditions, NO was actually reduced by CO contained in the feed gas. Thus, the maximum NO conversions in Fig.…”

“…On the other hand, Ogura et al [11] found that Ir/silicalite could catalyze NO reduction with CO even in the presence of SO 2 and excess oxygen. In our previous paper [12], we have reported that over binderless Ir/ZSM-5 monoliths prepared by a vapor phase transport technique, NO could be efficiently reduced by CO under lean conditions. Furthermore, the presence of 10% steam in the feed gas had no effect on the NO conversions.…”

An Ir/WO3 catalyst for selective reduction of NO with CO in the presence of O2 and/or SO2

“…The reaction results are also given in Table 1. According to the literature [1][2][3][4], diesel exhaust gases usually contain 6 -16% O 2 and 1 -500 ppm SO 2 . Such resistance of Ir/WO 3 catalyst to oxidation is useful for lean-burn engines.…”

“…Carbon monoxide is also one of the effective reducing agents involved in engine exhaust. It has recently been reported that Ir supported on silicate [3] and ZSM-5 [4] can catalyze NO reduction by CO even in the presence of excess oxygen. Hamada et al [5][6][7][8] have reported that catalysts made from Ir/SiO 2 alone or doped with various metals are active for NO reduction with CO in the presence of both O 2 and SO 2 .…”

Pd/γ-Al2O3 monolithic catalysts for NOx reduction with CH4 in excess of O2: Effect of precursor salt

“…For the CH 4 -SCR noble metals such as Pt, Pd and Rh among others have been employed as active phases [8][9][10], as too metal oxides such as Co, Fe or Cu [11] but in general the noble metals had higher activities than the metal oxides. An important drawback of Pt-based catalysts is the low N 2 selectivity with N 2 O being one of the principle reaction products [12,13].…”