Katalyzátory na bázi směsných oxidů pro environmentální aplikace.

Abstract

In this bachelor thesis, the direct decomposition of NO to oxygen and nitrogen was studied using catalysts based on Pb/Co3O4 mixed oxide modified with potassium and barium. Eight catalysts with different amounts of lead were prepared. The first set of four catalysts was modified with 2 wt. % of potassium and the second with 4 wt. % of barium. The stability, activity and physico-chemical properties of the catalysts were studied. The physico-chemical methods used for the characterization of catalysts were: AAS, X-ray diffraction, physical sorption of N2, TPR-H2. The results of the measurements showed that catalysts based on mixed cobalt oxides modified with alkali metals and alkaline earth metals are potentially suitable for the decomposition of NO. The effect of the alkaline promoter on the properties of the catalysts was tested. From the stability measurements of the catalysts, it was found that the Ba-modified catalysts were stable but showed lower activity, while the K-modified catalysts were unstable but showed higher activity. To improve the NO decomposition results, it is necessary to work on improving the stability of potassium-modified catalysts and increasing the activity of barium-modified catalysts.