Role of active oxygen and NOx species in N2O decomposition over Fe-ferrierite

0376640 - ÚFCH JH 2013 RIV US eng J - Článek v odborném periodiku
Sobalík, Zdeněk - Tabor, Edyta - Nováková, Jana - Sathu, Naveen Kumar - Závěta, K.
Role of active oxygen and NOx species in N2O decomposition over Fe-ferrierite.
Journal of Catalysis. Roč. 289, MAY 2012 (2012), s. 164-170. ISSN 0021-9517. E-ISSN 1090-2694
Grant CEP: GA AV ČR KAN100400702; GA ČR GA203/09/1627; GA ČR GAP106/11/0624
Výzkumný záměr: CEZ:AV0Z40400503
Klíčová slova: N2O decomposition * iron ferrierite * active oxygen
Kód oboru RIV: CF - Fyzikální chemie a teoretická chemie
Impakt faktor: 5.787, rok: 2012

Direct evidence for the formation of surface Fe–NOx species over iron ferrierites during decomposition of N2O was found with a combination of temperature-programmed desorption of adsorbed surface species and infrared and Mössbauer spectroscopies. Surface NOx species were produced via the conversion of a transiently formed Fe(III)–O by exposing iron ferrierites (Si/Al = 8.7, Fe/Al = 0.07–0.1) to N2O. The transformation of Fe(III)–O into Fe–NOx was time- and temperature- dependent. Below 280 °C, predominantly Fe(III)–O species were formed; these species are known to be highly active in oxidations at low temperatures. A transformation of Fe(III)–O into Fe–NOx species occurred when the reaction temperature was increased or when the reaction time was increased at low temperatures. This resulted in the disappearance of the oxidation activity of iron ferrierite. In contrast, the formation of Fe–NOx species enhanced the rate of N2O decomposition. Once formed, NOx species were stable during the subsequent N2O decomposition.
Trvalý link: http://hdl.handle.net/11104/0208991