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Journal of Thermal Analysis and Calorimetry
Authors: L. Chmielarz, M. Zbroja, P. Kuśtrowski, B. Dudek, A. Rafalska-Łasocha, and R. Dziembaj

Abstract  

Alumina, zirconia and titania pillared montmorillonites additionally modified with silver were tested as catalysts of NO reduction with NH3 or C2H4. Ammonia was much more effective reducer of NO than ethylene. The silver containing TiO2-pillared clay has been found to be the most active catalyst for NO reduction both with NH3 or C2H4. Oxidation of the reducing agents by oxygen limited the NO conversion in the high temperature region. The ammonia and nitric oxide adsorption sites were studied by the temperature programmed desorption methods (TPD).

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Journal of Thermal Analysis and Calorimetry
Authors: P. Kustrowski, A. Wegrzyn, L. Chmielarz, A. Bronkowska, A. Rafalska-Lasocha, and R. Dziembaj

Abstract  

Thermal decomposition of magnesium-aluminum hydrotalcites intercalated with four different polyoxometalate anions (V10O28 6−,Cr2O7 2−, W7O24 6−or Mo7O24 6−) was examined. The studied samples were prepared by the ion-exchange procedure starting from the parent carbonate-containing hydrotalcite. The successful synthesis was confirmed by powder X-ray diffraction and chemical analysis. The samples decomposed in two or three essential steps forming finally mixed metal oxides. The dichromate-containing hydrotalcite showed a thermal reduction of Cr6+ to Cr3+ ions.

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Abstract  

K-promoted hematite catalysts for ethylbenzene dehydrogenation were studied by thermal analysis (TG/DTG) and high-temperature XRD. The formation of potassium ferrite (K2Fe2O4), considered to be a catalytically active phase, was observed during calcination of the Ce-promoted catalysts. A linear correlation of the catalytic activity and the temperature of potassium ferrites formation was found.

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