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EN
Al2O3 or TiO2 pillared montmorillonites modified with Cu or Co have been studied as catalysts for NO reduction with ammonia. The type of a pillaring agent, introduced transition metal, and preparation conditions strongly influenced catalytic performance of obtained materials. Among the studied samples, the highest catalytic activity was measured for Ti-pillared montmorillonites modified with copper. All studied catalysts were characterized by high selectivity towards N2.
EN
Montmorillonites, pillared with Al2O3 or TiO2, were modified by introduction of transition metal (Cu or Co) by ion exchange method. Pillaring of clay with alumina caused significant increase of surface area and micropore volume due to increase of interlayer distance. Modification of montmorillonite with titania also resulted in increase of surface area and porosity, however pillared material was characterized by delaminated structure. Additionally, part of TiO2 was deposited on the sample surface in form of separate phase. Among the studied catalysts, titania pillared montmorillonites modified with copper have shown the highest activity in reduction of NO with ethylene in flue gas purifn.
PL
Katalizatory tlenkowe na nośniku y-Al2O3) o scharakteryzowanej stabilności termicznej (TG) oraz teksturze (BET) zastosowano w reakcjach rozkładu podtlenku azotu oraz odwodornienia etylobenzenu do styrenu. Zaproponowano alternatywną metodę otrzymywania styrenu na drodze odwodornienia etylobenzenu z użyciem N2O jako czynnika utleniającego. Najaktywniejszym katalizatorem reakcji okazał się Cr/y-AI2O) dla którego w temperaturze 450°C uzyskano 43% wydajności styrenu.
EN
Thermal stability (TG) and texture (BET) of transition metal oxides supported on y-Al2O3 were characterized. The catalysts were used in reactions of decomposition of nitrous oxide and ethylbenzene dehydrogenation to styrene. Alternative method of styrene production by ethylbenzene dehydrogenation in presence of N2O (used as oxidant) was proposed. Styrene yield of 43% was achived over the most active catalyst (Cr/y-Al2O3) at 450st.C.
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