The paper indicates coal mines as the source of permanent emission of low-concentrated gases, which have increased the greenhouse effect. This paper proposes the catalytic oxidation of methane as the solution to the problem of methane utilization when its concentration in the air is insufficient for flame combustion. The studies which have been conducted for many years enabled finding the active oxide and metallic catalytic systems for the reaction of methane oxidation. For the utilization of gases with low-concentrated methane, using the low-temperature catalysts, especially palladium catalysts, seems to be economically well-justified. Depending on technological solutions it can be considered as the method for methane utilization or as an environmentally friendly way for the generation of electric and thermal energy.
Selektywne katalityczne utlenianie amoniaku do azotu i pary wodnej jest obecnie uważane za jedną z najbardziej obiecujących metod usuwania amoniaku z gazów spalinowych i poprocesowych. W pracy omówiono technologię SCO, w tym stosowane w procesie katalizatory oraz mechanizmy przebiegu reakcji. Wykonano badania mieszanych tlenków pochodzenia hydrotalkitowego, w tym katalizatorów dwufunkcyjnych. Uzyskane wyniki jednoznacznie wskazują na duży potencjał materiałów hydrotalkitowych jako katalizatorów tego procesu. Zaproponowano dalsze kierunki badań w dziedzinie katalizatorów pochodzenia hydrotalkitowego dla procesu SCO.
EN
Selective catalytic oxidation of ammonia into nitrogen and water vapour is currently regarded as one of the most promising technologies for abatement of ammonia emissions from waste gases. This paper gives an overview of SCO technology, including the catalyst development and possible mechanisms of SCO reaction. The use of mixed metal oxides obtained from synthetic hydrotalcite-like materials in the role of catalysts for the SCO reaction has been reviewed. Obtained results clearly show huge potential of tested materials as industrial catalysts. Finally, future research directions in the area of NH3 oxidation based on mixed oxide catalysts derived from hydrotalcite-like materials are proposed.
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Przedstawiono wyniki badań właściwości katalitycznych układów Cu(Cr,Fe)/Al₂O₃, Cu(Cr,Fe)/ZSM-5 oraz hopkalitu w reakcji utleniania trimetyloaminy do azotu i wody. Najbardziej aktywnymi katalizatorami w badanej reakcji były Cu/ZSM-5 oraz katalizatory hopkalitowe. Dla hopkalitu kalcynowanego w 300°C oraz katalizatora Cu/ZSM-5 uzyskano konwersję ponad 80% w temp. odpowiednio 130 i 280°C. Najbardziej selektywne do azotu w zakresie temp. 310–460°C były katalizatory na nośniku ZSM-5, w szczególności układ zawierający Cu (niemal 100%).
EN
Ten Cu(Cr,Fe)/Al₂O₃, Cu(Cr,Fe)/ZSM-5 and hopcalite-based catalysts were used for catalytic oxidn. of NMe₃ to N₂ and H₂O. The most active catalysts were Cu/ZSM-5 and hopcalite-based ones. For hopcalite calcined at 300°C and Cu/ZSM-5 catalyst, the conversion was above 80% at 130 and 280°C, resp. The ZSM-5 zeolite-supported Cu oxide catalyst was the most selective to N₂ at 310–460°C (nearly 100%).
The paper indicates coal mines as the source of permanent emission of low-concentrated gases, which have increased the greenhouse effect. This paper proposes the catalytic oxidation of methane as the solution to the problem of methane utilization when its concentration in the air is insufficient for flame combustion. The studies which have been conducted for many years enabled finding the active oxide and metallic catalytic systems for the reaction of methane oxidation. For the utilization of gases with low-concentrated methane, using the low-temperature catalysts, especially palladium catalysts, seems to he economically well-justified. Depending on technological solutions it can be considered as the method for methane utilization or as an environmentally friendly way for the generation of electric and thermal energy.
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