Effect of zeolite structure on the selective catalytic reduction of NO with ammonia over Mn-Fe supported on ZSM-5, BEA, MOR and FER

Younes, Nada Ben; Ortigosa, Joaquín Martínez; Marie, Olivier; Blasco, Teresa; Mhamdi, Mourad

doi:10.1007/s11164-020-04382-7

Cited by 21 publications

(5 citation statements)

References 63 publications

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“…Figure 5 ), but also resulted in the formation of the secondary FER phase. Ben Younes et al [ 76 ] investigated the effects of the structure of Fe-zeolites on their catalytic performance in NH 3 -SCR. According to the authors, in the case of FER, the small aperture of channels resulted in the limited access of the reacting molecules to the inner structure of the material, and thus, led to a very poor activity in NO reduction.…”

Section: Discussionmentioning

confidence: 99%

Synthesis, Characterization, and NH3-SCR Catalytic Performance of Fe-Modified MCM-36 Intercalated with Various Pillars

et al. 2023

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Two series of MCM-36 zeolites intercalated with various pillars and modified with iron were synthesized, analyzed with respect to their physicochemical properties, and tested as catalysts for the NH3-SCR process. It was found that the characteristic MWW morphology of MCM-36 can be obtained successfully using silica, alumina, and iron oxide as pillars. Additionally, one-pot synthesis of the material with iron resulted in the incorporation of monomeric Fe3+ species into the framework positions. The results of catalytic tests revealed that the one-pot synthesized sample intercalated with silica and alumina was the most efficient catalyst of NO reduction, exhibiting ca. 100% activity at 250 °C. The outstanding performance of the material was attributed to the abundance of Lewis acid sites and the beneficial influence of alumina on the distribution of iron species in the zeolite. In contrast, the active centers originating from the Fe2O3 pillars improved the NO conversion in the high-temperature range. Nevertheless, the aggregated particles of the metal oxide limited the access of the reacting molecules to the inner structure of the catalyst, which affected the overall activity and promoted the formation of N2O above 300 °C.

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Section: Discussionmentioning

confidence: 99%

Synthesis, Characterization, and NH3-SCR Catalytic Performance of Fe-Modified MCM-36 Intercalated with Various Pillars

et al. 2023

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“…The former band is representative of OH groups at Mn atoms in non-framework locations, whereas the latter ones reflect acidic hydroxyls of different strengths. This could show the existence of Mn cations in various locations inside ZSM-5 channels [38][39][40] . On the other hand, the Mn-MFI imp sample, when compared to the Mn-MFIin sample, exhibits the same band at 3740, 3678, and 3615 cm -1 , but with a lower intensity.…”

Section: Framework Structurementioning

confidence: 93%

Synthesis, Characterization and Catalytic application of Mn-MFI prepared by Different Methods

Thabet

2023

Orient. J. Chem

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Utilizing various techniques, the synthesis of silicalite-1 (MFI), Mn-MFIin-situ, and Mn-MFIImp samples derived from rice husk has been studied. Several physico-chemical approaches were used to characterize the produced materials. The results showed that the addition of Mn ions through in-situ preparation methods will result in a rearrangement of Silicalite's structural composition and disappearance of quartz silica. The presence of crystalline MnO2 species was noted in Mn-MFIin-situ, dealumination, and a decrease in cell volume. According to XRD, ESR, and surface texture analyses, all of the samples' FTIR spectra showed MFI structure and good assimilation of Mn species into MFI channels. The catalytic activity of the samples was measured and judged to be toward hydroxylation of benzene at a temperature of 80 degrees Celsius. The data revealed that the catalytic activity occurred in the following order: Silicalite > Mn-MFIimp > Mn-MFIin-situ.

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“…The characteristic bonds of zeolite aluminosilicate tetrahedral are detected in the spectra, such as Si-O-Si bending, Si-O-Si stretching, Al-O stretching, Al-O-Si, and -OH bonds at around 462, 794, 694, 1049, and 3448 cm −1 , respectively [21][22][23]. The bands at around 1404 cm −1 are representing Brønsted acidic sites, while the bands at 1635 cm −1 can be assigned to Lewis acidic sites [24]. The two peaks at 2845 and 2924 cm −1 in FTIR spectra (Fig.…”

Section: Crystalline Area Percentage Of Mineral (mentioning

confidence: 99%

Modification of Natural Zeolite from Klaten, Indonesia Using Ammonium Chloride by Ion-Exchange and Its Application as Catalyst in Ethanol Dehydration to Produce Diethyl Ether

Adila,

Trisunaryanti,

Triyono

2024

Indones. J. Chem.

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Modification of a natural zeolite from Klaten, Indonesia, as a catalyst in the dehydration of ethanol to produce diethyl ether (DEE) has been conducted. Raw Klaten natural zeolite (ZA) was modified using 1 and 2 M of an ammonium chloride solution for 24 h while stirring for 18 h, then calcined at 500 °C for 5 h under N2 gas flow produced HZA1 and HZA2 catalyst, respectively. The catalysts were characterized using XRD, BET surface area, SEM-EDX, XRF, FTIR and gravimetric acidity test using ammonia-based vapor. The dehydration process was conducted under variations of temperature (200, 250, and 300 °C) and catalyst mass of 0.1, 0.2, and 0.4 g for 20 mL of 96% ethanol. The HZA1 catalyst produced the highest yield of DEE (2.41%) at 250 °C and 0.1 g catalyst. This catalyst showed needle-like of 66.22 nm crystal size, consisting of 32.57% mordenite, the highest surface area (48.32 m2/g), crystallinity (32.93%) and Brønsted acid sites (2.75 mmol/g), the lowest pore diameter (1.77 nm) and Si/Al mol ratio (4.03). The HZA1 catalyst can be used repetitively and produced DEE yield at the second and third runs (2.40 and 2.61%).

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Effect of zeolite structure on the selective catalytic reduction of NO with ammonia over Mn-Fe supported on ZSM-5, BEA, MOR and FER

Cited by 21 publications

References 63 publications

Synthesis, Characterization, and NH3-SCR Catalytic Performance of Fe-Modified MCM-36 Intercalated with Various Pillars

Synthesis, Characterization, and NH3-SCR Catalytic Performance of Fe-Modified MCM-36 Intercalated with Various Pillars

Synthesis, Characterization and Catalytic application of Mn-MFI prepared by Different Methods

Modification of Natural Zeolite from Klaten, Indonesia Using Ammonium Chloride by Ion-Exchange and Its Application as Catalyst in Ethanol Dehydration to Produce Diethyl Ether

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