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

In situ and post-synthesis control of physicochemical properties of FER-type crystals

“…This zeolite structure is particularly appropriate for processing small molecules and can withstand very severe thermal conditions and aggressive chemical atmosphere. For instance Fe-loaded FER-type zeolite is used for removing NO x and N 2 O from the nitric acid production process [3]. FER-type catalysts are also widely used for NO x reduction in stationary and mobile sources [4,5].…”

Catalytic properties of extraframework iron-containing species in ZSM-5 for N2O decomposition

“…These considerations have inspired significant efforts in the past decade in identifying the nature of the active site and the reaction mechanism for N 2 O decomposition over Fe/ZSM-5 catalysts [4][5][6]. Despite the apparent simplicity of this reaction, these issues remain under debate [2,3,[7][8][9][10][11][12][13][14][15][16].…”

Role of Pt(0) in bimetallic (Pt,Fe)-FER catalysts in the N2O decomposition

“…Fe-zeolites represent promising catalysts for the abatement of N 2 O from various sources [1][2][3]. Recently, it has been shown that ferrierites (FER) containing even low Fe loading (Fe/Al < 1) exhibit considerably higher catalytic activity in the N 2 O decomposition than Fe-MFI or Fe-BEA zeolites [4].…”

“…The main role in the decomposition of N 2 O over Fe-FER is assigned to Fe(II) bare cations located in cationic positions (a, b) and especially to peculiar iron arrangement at optimal FeÁ Á ÁFe distances between two Fe ions in b sites comparable to the length of the N 2 O molecule [1,4,5]. Predominant location of Fe(II) b cationic sites in Fe-FER at low iron loading (Fe/ Al < 1) was confirmed by Fourier transformed infrared (FTIR) and Mössbauer spectroscopy (MBS) measurements [1,4,[6][7][8].…”

“…Combination of noble metals with iron ions obviously prevents the poisoning effect of NO on the noble metal zeolite when alone. Thus, the bimetallic Me/Fe-ferrierites principally retain the mechanism of N 2 O decomposition over Fe-ferrierites (Fe-FER) and display highly positive action of NO in the gas phase or via NO x intermediates [1,13,14]. These intermediates are assumed to originate via a reaction of nitrous oxide with ''active'' oxygen formed during the first reaction steps.…”