SELECTIVE REDUCTION OF NITRIC OXIDE ON NICKEL OXIDE-COPPER OXIDE SUPPORTED CATALYSTS

Article abstract of DOI:10.1021/j100411a016

Selective catalytic reduction of nitrogen oxides (NOx) is one of the main alternatives for reducing atmospheric pollution produced by NOx emissions from static sources.Experimental results described in this paper were carried out in the framework of a more general study undertaken in order to develop an industrial process for the abatement of NOx emissions from nitric acid plants.The catalyst used was NiO-CuO/γ-Al2O3 and the reactions studied were NO reduction with NH3 (in the presence and absence of oxygen) and NH3 oxidation with oxygen, both at atmospheric pressure and in the temperature range between 200 and 300 deg C.A kinetic equation was developed by using three different reaction models.This equation fits the experimental results in the above-mentioned temperature range very well, but at high temperatures experimental values clearly deviate from the model predictions.The paper ends by discussing current data in the literature and the experimental evidence obtained in this work in order to postulate a more complex mechanism for the NO reduction with NH3 on oxide-supported catalysts.This discussion pointed out possible new lines of research in order to clarify the physical chemistry of the oxidation-reduction system involved in detail.