1. Introduction
The selective catalytic reduction (SCR) of NO with NH3 process has been studied by many investigations in recent years with copper-based catalysts for conversion of NO, since the copper-containing catalysts (zeolite- and oxide-based catalysts) have high catalytic activity. The reduction mechanism of NO over Cu-zeolite, in the absence of oxygen, has been investigated and it was found that the CuO-based catalysts containing Cu-zeolite have a high activity for the reaction of NO with NH3.1,2 Also, CuO/zeolite catalyst has a distinct advantage of decreasing NH3 oxidation over other catalysts to remove NOx.3 T self-inhibiting effect of NOx in the SCR of NOx in a diesel engine over a Cu-zeolite catalyst has also been observed. This effect is strongest at lower temperatures (<250 °C) and became negligible above 300 °C.4 It is also reported that CuO/γ-Al2O3 catalyst has two possible reaction pathways of NO reduction to N2, one via a nitrosoamide-like intermediate and second via an ammonium nitrate-like intermediate or their equivalent Cu complexes [NO-Cu-NH2 and NO2-Cu-NH4, respectively]. The reaction mechanism of the SCR of NO with NH3 in the presence of O2 over CuO/γ-Al2O3 catalyst has also been summarized.

Verwandte Artikel

• Wie funktioniert BlueTEC (0)
• Verkehr SCR-Technik Umweltbundesamt (0)
• Untersuchung der Beeinträchtigung der Funktionalität von Abgasnachbehandlungssystemen beim Einsatz von Biokraftstoffen und Ableitung von Qualitätsanforderungen an neue Kraftstoffe (0)
• Stationary and Marine SCR Applications (0)
• SCR Wikipedia (0)