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.

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ABSTRACT

Realizing the need for e®ective kinetic models that could be used over wide op-erating regimes, oxidation and storage kinetics for a diesel oxidation catalyst (DOC) were developed in this work. As a first step towards kinetics development, a simple catalyst formulation including only Platinum was chosen. Kinetics were generated by assuming that propylene was representative all the hydrocarbons (HCs) in the exhaust. A systematic methodology was formulated which consisted of (1) careful choice of concentration/temperature domain (2) measurement of reactor conversions of aged catalyst samples at chosen test points using a high space velocity integral reactor (3) developing a simplified 1D reactor model (4) defining an objective func- tion which is critically sensitive to the differences between model predictions and experiments at all conversions (5) generating proper initial guesses and finally (6) modifying Langmuir-Hinshelwood rate expressions to arrive at the final rate forms. This methodology can be used to generate steady state global kinetics in general.

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Hochschule für Technik und Wirtschaft Dresden (FH) University of Applied Sciences Forschungsbericht 2007

Projektleiter: Prof. Dr.-Ing. G. Zikoridse
Projektlaufzeit: 07/2007 – 06/2010
Kooperationspartner: Fa. Greentop GmbH, Öko Zentrum Nossen GmbH, Reupert & Grohmann GbR
Förderer: AiF /S.131

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