Simultaneous Catalytic Removal of NO and N2O using Fe–MFI

Kögel, M.; Mönnig, R.; Schwieger, Wilhelm; Tißler, A.; Turek, Thomas

doi:10.1006/jcat.1998.2371

Cited by 157 publications

(99 citation statements)

References 17 publications

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“…The use of Fe-MFI systems for direct N 2 O decomposition has been described in several publications [1][2][3][4]. Fe-ZSM5 catalysts have also attracted much attention due to their extraordinary activity for hydrocarbon-assisted reduction of N 2 O [5,6], N 2 O reduction by NH 3 [7], oxidation of benzene to phenol (Panov's group [8]), and selective catalytic reduction (SCR) of NO x with hydrocarbons [9][10][11][12] and NH 3 [13].…”

Section: Introductionmentioning

confidence: 99%

Utilizing full-exchange capacity of zeolites by alkaline leaching: Preparation of Fe-ZSM5 and application in N2O decomposition

Melián‐Cabrera

Espinosa

Groen

et al. 2006

Journal of Catalysis

109

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Section: Introductionmentioning

confidence: 99%

Utilizing full-exchange capacity of zeolites by alkaline leaching: Preparation of Fe-ZSM5 and application in N2O decomposition

Melián‐Cabrera

Espinosa

Groen

et al. 2006

Journal of Catalysis

109

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“…Iron loaded zeolites have recently attracted renewed attention due to their outstanding catalytic properties [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. In particular, over-exchanged Fe/ZSM5 (Fe/Al molar ratio > 0.5) obtained through the chemical vapor deposition (CVD) of anhydrous iron trichloride has been reported to be very efficient in the selective catalytic reduction of nitrogen oxides using HydroCarbons (HC-SCR).…”

Section: Introductionmentioning

confidence: 99%

“…These include aqueous ion exchange from ferrous oxalate, performed under exclusion of air [8], and solid-state ion exchange using Fe(II)chloride [9,10], Fe(III)chloride [11][12][13][14] or FeSO 4 · 7H 2 O [15]. The synthesis in aqueous solution with ferrous oxalate as precursor has led to results comparable to those obtained through the CVD of FeCl 3 , with respect to both the iron loading and the catalytic activity towards HC-SCR with isobutane.…”

Section: Introductionmentioning

confidence: 99%

Evolution of Fe species during the synthesis of over-exchanged Fe/ZSM5 obtained by chemical vapor deposition of FeCl3

Battiston

Bitter

Groot

et al. 2003

Journal of Catalysis

163

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The evolution of iron in over-exchanged Fe/ZSM5 prepared via chemical vapor deposition of FeCl 3 was studied at each stage of the synthesis. Different characterization techniques (EXAFS, HR-XANES, 57 Fe Mössbauer spectroscopy, 27 Al NMR, EELS, HR-TEM, XRD, N 2 physisorption, and FTIR spectroscopy) were applied in order to correlate the changes occurring in the local environment of the Fe atoms with migration and aggregation phenomena of iron at micro-and macroscopic scale. Mononuclear isolated Fe-species are formed upon FeCl 3 sublimation, which are transformed into binuclear Fe-complexes during washing. During calcination, iron detached from the Brønsted sites migrates to the external surface of the zeolite, finally leading to significant agglomeration. Nevertheless, agglomeration of Fe can be strongly suppressed by adequately tuning the conditions of the calcination.  2002 Elsevier Science (USA). All rights reserved.

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“…The procedure is detailed described in Refs. [33,34]. The final catalyst powder, containing 4.98% Fe (w/w) determined by ICP, was pressed into tablets and crushed to a particle size fraction of 250-500 m which was used in all experiments.…”

Section: Preparation Of the Catalystmentioning

confidence: 99%

Experimental techniques for investigating the surface oxygen formation in the N2O decomposition on Fe-MFI zeolites

Ateş¹,

Reitzmann²

2007

Chemical Engineering Journal

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Several experimental techniques were used to investigate the formation of surface oxygen in the N 2 O decomposition on an Fe-MFI zeolite. These techniques consisted of multipulse and step experiments as transient methods at ambient pressure and experiments in a closed set-up of Panov and co-workers at strongly reduced pressure. The total amount of surface oxygen determined through multipulse experiments was in the range of the amount obtained in the vacuum set-up at 523 K (40-50 mol O g −1 catalyst ). In contrast, the step technique revealed considerably higher values, up to 110 mol O g −1 catalyst , indicating an accumulation of oxygen in the zeolite. This phenomenon might also be responsible for the observation that higher reaction temperatures increase the total amount of surface oxygen, which can be deposited in the zeolite. In contrast to experiments in the vacuum set-up, the temperature-programmed desorption after multipulse and step experiments shows the presence of various oxygen species differing in thermal stability. The influence of temperature on the rate of surface oxygen formation was determined from step and vacuum experiments. The results of the step experiments lead to a lower activation energy, 14 kJ mol −1 , than the experiments in the vacuum set-up (49 kJ mol −1 ), probably due to sorption and mass transfer effects. Comparing the rate of surface oxygen formation and of total N 2 O decomposition reveals that the former is very fast and not rate determining for the latter. Furthermore, the rate of total N 2 O decomposition seems to be inhibited by adsorbed N 2 O, detected in the transient experiments. This observation is considered in an adequate kinetic model.

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Simultaneous Catalytic Removal of NO and N2O using Fe–MFI

Cited by 157 publications

References 17 publications

Utilizing full-exchange capacity of zeolites by alkaline leaching: Preparation of Fe-ZSM5 and application in N2O decomposition

Utilizing full-exchange capacity of zeolites by alkaline leaching: Preparation of Fe-ZSM5 and application in N2O decomposition

Evolution of Fe species during the synthesis of over-exchanged Fe/ZSM5 obtained by chemical vapor deposition of FeCl3

Experimental techniques for investigating the surface oxygen formation in the N2O decomposition on Fe-MFI zeolites

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