Synthesis and spectroscopic studies of Fe3+ substituted ZSM-5 zeolite

Calis, G.H.M.; Frenken, P.; Boer, E. de; Swolfs, A.E.M.; Hefni, M. A.

doi:10.1016/0144-2449(87)90034-0

Cited by 72 publications

(17 citation statements)

References 17 publications

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“…Obermeyer et al (6,7) studied the nature of metal ions, in which they replaced the Si 4+ by Al 3+ and many other transition metals in ZSM-5 structure without changing the framework, and produced highly selective catalytic properties. In the framework of zeolites, even a trace amount of trivalent elements will change in acidity significantly, resulting a change of catalytic activity.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Iron Atoms in the Framework of MFI-Type Zeolites by UV Resonance Raman Spectroscopy

Xiong

et al. 2000

Journal of Catalysis

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Section: Introductionmentioning

confidence: 99%

Characterization of Iron Atoms in the Framework of MFI-Type Zeolites by UV Resonance Raman Spectroscopy

Xiong

et al. 2000

Journal of Catalysis

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“…Especially, it might be illustrated that the absorption peak of g＝4.3 shows partial iron atoms doped into the albite framework [TO 4 ], forming a tetrahedral structure. [34] XRD spetra of Pb/Ab and Fe/Ab catalysts with different Pb or Fe contents are depicted in Figure 4. As shown in Figure 4a, the typical diffraction peaks at 2θ＝20°-34° indicates that the framework of the albite was still retained without obvious changes of relative crystallinity in all the samples, which can be indexed to pure albite Na(Al Si 3 O 8 ) (JCPDS 99-0001).…”

Section: Catalyst Characterizationmentioning

confidence: 99%

Non‐Oxidative Methane Conversion Using Lead‐ and Iron‐Modified Albite Catalysts in Fixed‐Bed Reactor

Chen

Wang

Luo³

et al. 2018

Chin. J. Chem.

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Raw and modified albite catalysts, including Pb/Albite and Fe/Albite catalysts, have been investigated for methane conversion to C2 hydrocarbons under non‐oxidative conditions. Introduction of Pb to albite improved the activity and selectivity to non‐coke products. Based on characterization, it was found that Pb entered into the alkali and alkaline‐earth metal sites of albite, while partial Fe doped in the tetrahedron sites and the other loaded on the surface of albite. At the reaction temperature of 1073 K, methane gas hourly space velocity (GHSV) of 2 L·gcat–1·h–1, catalyst dosage of 0.25 g (300 mesh), the methane conversion catalyzed by raw albite in the fixed‐bed micro reactor exhibited a methane conversion of 3.32%. Notably, introducing a Pb content of 3.4 wt% into albite greatly enhanced the conversion of methane up to 8.19%, and the selectivity of C2 hydrocarbons reached 99% without any coke under the same reaction conditions. While Fe‐doping could weakly heighten the methane conversion to 3.97%, and coke was formed. Thus, a comparison of Pb/Albite and Fe/Albite catalysts demonstrates that the catalytic activity of albite is mainly decided by alkali and alkaline‐earth metal sites, and lead‐modification can effectively improve the catalytic activity of albite.

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“…The data provided "a rather convincing indication" of the preferential location of iron at T9 and T10 sites (Figure 1.2). Calis et al (162) and Fejes et al (65) inferred, on the basis of 57 Fe M€ ossbauer, EPR, and 29 Si MAS NMR (162) spectra, that the fraction of Fe 3+ incorporated at tetrahedral sites in the framework after calcination is limited. Calis et al (162) and Fejes et al (65) inferred, on the basis of 57 Fe M€ ossbauer, EPR, and 29 Si MAS NMR (162) spectra, that the fraction of Fe 3+ incorporated at tetrahedral sites in the framework after calcination is limited.…”

Section: Iron-containing Zeotype Materialsmentioning

confidence: 99%