Selective catalytic reduction of NOX with ammonia NH3-SCR over transition metal-based catalysts -influence of the catalysts support

• Autorzy: Szymaszek Agnieszka , Samojeden Bogdan , Motak Monika

Identyfikatory

DOI

10.5277/ppmp19066

• Języki publikacji: EN

Abstrakty

EN

Natural layered clays (bentonite and vermiculite) and natural zeolite (clinoptilolite) were tested and compared as the supports of the catalysts forselective catalytic reduction withammonia (NH₃-SCR). The raw materials were modified in order to improve their catalytic properties. Layered clays were treated with HNO₃ and intercalated with Al₂O₃ pillars to enhance their acidity, porosity and specific surface area. Clinoptilolite was ion-exchanged with NH₄NO₃ in order to increase the content of Brönsted acid sites, indispensablefor NH₃ adsorptionduring the reaction. Subsequently, iron as an active phase was deposited on the modified supports by various methods, including incipient wetness impregnation, ion-exchange and co-precipitation. The efficiency of these methods was compared as NO_x conversionobtained for each material. XRD analysis indicated that the initial modifications affected the structure of the raw aluminosilicates. FT-IR measurement confirmed the presence of characteristic Si-O and Al-O bonds and H₂O molecules that occurnaturally in the materials. UV-Vis spectroscopy results indicated that different types of Fe species were deposited on the catalysts surface and theirform strongly depends on the type of the support. NH₃-SCR catalytic tests showedthat all of the analyzed materials exhibitsatisfactory level of NO conversion and negligible concentration of by-product (N₂O) in the exhaust gas. The highest catalytic activity (ca. 50% at 170°C and over 95% above 250°C) was obtained for Fe-Bent. The lowest concentration of N₂O in the flue gas (less than 5 ppm in the whole temperature range) was observed for Fe-Clin.

Słowa kluczowe

EN

NH3-SCR; NOx; clinoptilolite; layered clays; iron

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Physicochemical Problems of Mineral Processing
• Rocznik: 2019
• Tom: Vol. 55, iss. 6
• Strony: 1429--1441
• Opis fizyczny: Bibliogr.62 poz.., tab, wykr.

Twórcy

autor

Szymaszek Agnieszka

• AGH University of Science and Technology, Faculty of Energy and Fuels, Al. Mickiewicza 30, 30-059 Kraków, Poland

autor

Samojeden Bogdan

• AGH University of Science and Technology, Faculty of Energy and Fuels, Al. Mickiewicza 30, 30-059 Kraków, Poland

autor

Motak Monika

• AGH University of Science and Technology, Faculty of Energy and Fuels, Al. Mickiewicza 30, 30-059 Kraków, Poland

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Uwagi

1. The research was financed by AGH Grant 16.16.210.476

2. Opracowanie rekordu ze środków MNiSW, umowa Nr 461252 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2020).