Effect of high-temperature treatment on Fe/ZSM-5 prepared by chemical vapor deposition of FeCl3

Hensen, Ejm Emiel; Zhu, Qingjun; Hendrix, Marco Mrm Marco; Overweg, AR Arian; Kooyman, Patricia J.; Sychev, MV; Santen, van Ra Rutger

doi:10.1016/j.jcat.2003.09.024

Cited by 197 publications

(108 citation statements)

References 56 publications

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“…In the past years numerous articles appeared on the identification of binuclear complexes by spectroscopic techniques and chemical probe reactions [1,2,[30][31][32][33][34][35][36][37][38][39]. EXAFS studies have had a leading position for the characterization of these complexes.…”

Section: Binuclear Fe Fementioning

confidence: 99%

New frontiers in X-ray spectroscopy in heterogeneous catalysis: Using Fe/ZSM-5 as test-system

et al. 2005

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We have applied a number of novel X-ray spectroscopic tools to Fe/ZSM-5 systems. Fe/ZSM-5 can be considered as an ideal test-system for the characterization techniques in heterogeneous catalysis. The existence of a large range of sites and structures creates a good testing ground to determine which experimental tools are able to resolve such complex system. In situ soft X-ray absorption provides important information on the valence and electronic structure of iron during treatments, with a time scale down to 30 s. Kb-detected XANES yields unprecedented resolution for pre-edge structures and using hard X-rays can be used under any condition and treatment, including high-pressures. It can be expected that both in situ soft X-ray absorption and Kb-detected XANES become 'standard' tools for catalysis research, similar to traditional XANES and EXAFS today. The X-MCD is also used in this paper but it will probably remain a rather specialized technique in the field of heterogeneous catalysis. Further new developments for catalysis characterization are for all to be expected from X-ray spectro-microscopy, where one will have the possibility to perform the in situ soft X-ray absorption and Kb-detected XANES experiments with nanometer size spatial resolution. #

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Section: Binuclear Fe Fementioning

confidence: 99%

New frontiers in X-ray spectroscopy in heterogeneous catalysis: Using Fe/ZSM-5 as test-system

et al. 2005

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“…This catalyst is used in the N 2 O decomposition to O 2 and N 2 [1][2][3][4][5][6][7][8][9]. The observed activity strongly depends on the catalyst preparation, composition (Si/Al and Fe/Al ratios) and zeolite activation [10][11][12][13][14][15][16][17][18][19][20][21]. In our previous publications [1,22], we reported that traces of iron (<1000 ppm) in isomorphously substituted HZSM-5 upon steaming and/or high temperature calcinations in He renders the catalyst highly active towards N 2 O decompositions at low temperatures (280 8C T 380 8C).…”

Section: Introductionmentioning

confidence: 99%

Low temperature decomposition of nitrous oxide over Fe/ZSM-5: Modelling of the dynamic behaviour

2005

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The kinetics of N 2 O decomposition to gaseous nitrogen and oxygen over HZSM-5 catalysts with low content of iron (<400 ppm) under transient and steady-state conditions was investigated in the temperature range of 250-380 8C. The catalysts were prepared from the HZSM-5 with Fe in the framework upon steaming at 550 8C followed by thermal activation in He at 1050 8C. The N 2 O decomposition began at 280 8C. The reaction kinetics was first order towards N 2 O during the transient period, and of zero order under steady-state conditions. The increase of the reaction rate with time (autocatalytic behaviour) was observed up to the steady state. This increase was assigned to the catalysis by adsorbed NO formed slowly on the zeolite surface from N 2 O. The formation of NO was confirmed by temperature-programmed desorption at temperatures >360 8C. The amount of surface NO during the transient increases with the reaction temperature, the reaction time, and the N 2 O concentration in the gas phase up to a maximum value. The maximum amount of surface NO was found to be independent on the temperature and N 2 O concentration in the gas phase. This leads to a first-order N 2 O decomposition during the transient period, and to a zero-order under steady state. A kinetic model is proposed for the autocatalytic reaction. The simulated concentration-time profiles were consistent with the experimental data under transient as well as under steady-state conditions giving a proof for the kinetic model suggested in this study. #

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“…Because of the thermal regeneration of DPF, temperatures of the exhaust which contains about 10% water are increased and result in the formation of a high temperature hydrothermal condition, which can lead to deactivation of the SCR catalyst. Kröcher et al [22] investigated the hydrothermal stability of a Fe-ZSM-5 catalyst coated on cordierite and observed 5%-15% loss in the deNO x activity of the catalyst after hydrothermal aging at 650 o C in 10% H 2 O for 50 h. Hensen et al [23] studied the effects of thermal and hydrothermal treatment on Fe/ZSM-5 prepared by the CVD method for N 2 O decomposition. They found that after severe hydrothermal aging the activity of the catalyst observed decreased, and the Fe 3+ migrated out of the ion exchange sites as well, followed by the iron oxide aggregated and Al removed from framework positions.…”

mentioning

confidence: 99%

Hydrothermal Deactivation of Fe-ZSM-5 Prepared by Different Methods for the Selective Catalytic Reduction of NOx with NH3

Shi¹,

LIU²,

Shan³

et al. 2012

Chinese Journal of Catalysis

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Effect of high-temperature treatment on Fe/ZSM-5 prepared by chemical vapor deposition of FeCl3

Cited by 197 publications

References 56 publications

New frontiers in X-ray spectroscopy in heterogeneous catalysis: Using Fe/ZSM-5 as test-system

New frontiers in X-ray spectroscopy in heterogeneous catalysis: Using Fe/ZSM-5 as test-system

Low temperature decomposition of nitrous oxide over Fe/ZSM-5: Modelling of the dynamic behaviour

Hydrothermal Deactivation of Fe-ZSM-5 Prepared by Different Methods for the Selective Catalytic Reduction of NOx with NH3

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