Selective catalytic reduction of nitric oxide with ammonia over Fe-Cu modified highly silicated zeolites

Jouini, Houda; Mejri, Imène; Martínez-Ortigosa, Joaquín; Cerrillo, José Luis; Mhamdi, Mourad; Palomares, Emilio; Delahay, Gérard; Blasco, Teresa

doi:10.1016/j.solidstatesciences.2018.08.008

Cited by 24 publications

(10 citation statements)

References 49 publications

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“…Examination of ICP results shows that metals are well retained by the zeolite during the preparation process where the experimental amounts approximate the theoretical values set for the catalysts preparation. This result is expected since the SSIE is the most convenient method for controlling the metal amount in the prepared solids, which is in perfect agreement with our previous works [12][13][14]. The ratio of the parent zeolite stated by Zeolyst (CBV024E, Si/Al=15) was decreased in the case of prepared catalysts and that can be attributed to the reproducibility of routine sequential syntheses which may vary from batch to batch [30].…”

Section: Characterisation Resultssupporting

confidence: 89%

“…To be an interesting candidate for automotive Diesel applications, such catalyst must support the severe conditions of vehicle engine and show a high hydrothermal stability up to 800 °C [10][11][12][13][14]. Recently, Ce-based catalysts [15][16][17][18] have also received considerable attention for NO removal through the NH 3 -SCR process thanks to its single properties to combine elevated oxygen transport capacity and to shift easily between Ce 4+ /Ce 3+ reduced and oxidized states [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

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Ce-promoted Fe–Cu–ZSM-5 catalyst: SCR-NO activity and hydrothermal stability

et al. 2021

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Fe-Cu-ZSM-5 and Ce-Fe-Cu-ZSM-5 solids prepared using solid-state ion exchange method (SSIE) were tested in the NH 3 -SCR of NO reaction and were characterized using N 2 physisorption at 77 K, MAS 27 Al magnetic resonance, X-ray diffraction, scanning electron microscopy, EPR spectroscopy and transmission electron microscopy coupled to energy dispersive X-ray spectroscopy in order to follow the effect of Ce addition on the textural and structural properties of Fe-Cu-MFI system as well as the detection of the changes in local environment and state of iron and copper species, and the degradation of the zeolite texture and structure after a severe aging treatment at 850 °C for 5h. Fresh Ce-promoted sample showed better NO conversion up to 450 °C than unpromoted Fe-Cu-ZSM-5 catalyst. An activity loss was observed on aged catalysts, but remaining less pronounced for the catalyst 2 containing Ce. The changes in catalyst structure and texture did not occur during aging while a probable migration of metal active species and change in their coordination has occurred.

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Section: Characterisation Resultssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Ce-promoted Fe–Cu–ZSM-5 catalyst: SCR-NO activity and hydrothermal stability

et al. 2021

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“…Fig. 1 shows slight reductions in the peak intensities of the Fe-ZSM-5 and Fe-BETA catalysts due to the higher X-ray absorption coefficient of Fe compounds [29,30] peaks from FeO x nanoparticles were observed for Fe-ZSM-5 evidencing only the presence of Fe-exchanged active species in the zeolite structure. However, the existence of tiny FeO x species cannot be totally excluded as considering their amounts are possibly below the XRD detection limit.…”

Section: Catalytic Activitymentioning

confidence: 99%

Influence of co-fed gases (O2, CO2, CH4, and H2O) on the N2O decomposition over (Co, Fe)-ZSM-5 and (Co, Fe)-BETA catalysts

Biturini

Santos

Batista

2018

Reac Kinet Mech Cat

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The influence of co-fed gases (O 2 , CO 2 , CH 4 , and H 2 O) on the N 2 O decomposition over (Co or Fe)-BETA and (Co, Fe)-ZSM-5 catalysts prepared by ion exchange method was investigated. Co 2+ ions and oxo dinuclear Co species were identified in Co-ZSM-5 and Co-BETA catalysts. Isolated and oligomeric Fe 3+ species in cationic sites and Fe 2 O 3 particles were found on surface of the Fe-ZSM-5 and Fe-BETA catalysts. Cobalt catalysts were more actives than iron catalysts for the direct decomposition of N 2 O. Conversion of N 2 O over Fe-BETA and Fe-ZSM-5 was remained stable when co-fed O 2 , CO 2 , and CH 4 , but decreases with water vapor. However, Co-BETA and Co-ZSM-5 showed much larger reaction rate for N 2 O decomposition and were very stable when co-fed O 2 , CO 2 , CH 4 , and especially H 2 O. The results showed that the higher CH 4 consumption during N 2 O reaction over Co-BETA and Co-ZSM-5 was due to CH 4 combustion. Keywords N 2 O decomposition • Co-fed gases • Iron species • Cobalt species • ZSM-5 zeolite • BETA zeolite

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“…Hence, to meet industrial applications, researchers have prepared bimetal-exchanged zeolite (Cu and Fe) catalysts by combining their respective advantages, which has proved to be a feasible strategy. 4,5 For example, the Fe-Cubeta catalyst was prepared by two-step ion exchange method, and it not only maintains the low-temperature activity of Cubeta zeolites, but also improves its high-temperature activity and widens the temperature window. 4 Coincidentally, Zhao et al 5 used a liquid-phase ion exchange method to load Fe on Cu-CHA, and the bimetallic zeolites catalyst presented increased low-temperature activity and a wider temperature window.…”

Section: Introductionmentioning

confidence: 99%

“…4,5 For example, the Fe-Cubeta catalyst was prepared by two-step ion exchange method, and it not only maintains the low-temperature activity of Cubeta zeolites, but also improves its high-temperature activity and widens the temperature window. 4 Coincidentally, Zhao et al 5 used a liquid-phase ion exchange method to load Fe on Cu-CHA, and the bimetallic zeolites catalyst presented increased low-temperature activity and a wider temperature window. The above researches have revealed that there is strong synergy effect between Cu and Fe species on Cu-Fe bimetallic zeolites and both the active sites and the oxidation-reduction ability of the catalyst have changed, which may lead to the combination of their catalytic advantages and result in more excellent low temperature activity and improved temperature window.…”

Section: Introductionmentioning

confidence: 99%