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

Battiston, A.A.; Bitter, Johannes H.; Groot, Frank M. F. de; Overweg, A.R.; Stéphan, Odile; Bokhoven, Jeroen A. van; Kooyman, Patricia J.; Spek, C. van der; Vankó, György; Koningsberger, D.C.

doi:10.1016/s0021-9517(02)00051-9

Cited by 165 publications

(63 citation statements)

References 57 publications

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“…In the literature, this peak has been modeled as an Fe-Fe path with 0.5 e N e 1.6. 2,11,13,[24][25][26]30 The curvefit distance at 2.94 Å is 0.23 Å longer than that reported for a simple di-μ-oxo bridged compound, L 2 Fe 2 -(μ-O) 2 (L is tris(2-pyridylmethyl)amine), at 2.71 Å; 18 however, it is considerably shorter than the Fe-Fe distance in…”

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confidence: 76%

“…18 XAFS has also proven to be a powerful tool for establishing the connectivity of the Fe species present in Fe/ZSM-5. 3,11,13 Recently, the intentional incorporation of extra-framework Al or Ga was shown to enhance greatly the activity of Fe/ZSM-5 for N 2 O decomposition.…”

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confidence: 99%

“…13,24 The curvefit in Figure S3 also contains an Fe-Fe path giving rise to a peak at ca. 2.5 Å in R-space.…”

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confidence: 99%

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Spectroscopic Evidence of Extra-Framework Heterometallic Oxo-Clusters in Fe/Ga-ZSM-5 Catalysts

Xia

Fleischman²,

et al. 2011

J. Phys. Chem. Lett.

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The effect of introducing extra-framework Ga on the local structure of the metal sites in Fe/ZSM-5, resulting in enhanced reactivity toward N 2 O, was investigated using a combination of Raman and X-ray absorption spectroscopies. The Raman spectra indicate an increased abundance of oxo-and/or hydroxobridged diiron sites, whereas the Fe K-edge XANES reveals more extensive reduction of Fe(III) to Fe(II). Curvefits of the EXAFS at both the Ga and Fe K-edges are consistent with heterometallic oxo-clusters containing both Ga-Fe and Fe-Fe paths. The spectroscopic evidence suggests a tetranuclear [Fe 2 Ga 2 O 4 2þ ] core, possessing an open dicubane structure.

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confidence: 76%

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confidence: 99%

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Spectroscopic Evidence of Extra-Framework Heterometallic Oxo-Clusters in Fe/Ga-ZSM-5 Catalysts

Xia

Fleischman²,

et al. 2011

J. Phys. Chem. Lett.

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“…Various techniques, including FTIR, H 2 -TPR, XANES, EXAFS, Mössbauer spectroscopy, EPR and UV/Vis DRS, were used for the characterization of iron species during the CVD preparation process of Fe-ZSM-5 catalysts [30][31][32]. After FeCl 3 sublimation, iron was introduced into the zeolite, exchanging with the Brønsted protons in the form of isolated FeCl 2+ species [30][31][32].…”

Section: Chemical Vapor Deposition (Cvd)mentioning

confidence: 99%

“…After FeCl 3 sublimation, iron was introduced into the zeolite, exchanging with the Brønsted protons in the form of isolated FeCl 2+ species [30][31][32]. The EXAFS fitting results revealed that the majority of Fe species formed after FeCl 3 sublimation and reaction with the Brønsted acid sites were mononuclear, and consisted of isolated tetrahedral Fe 3+ species attaching to the zeolite matrix via two oxygen atoms at the same distance.…”

Section: Chemical Vapor Deposition (Cvd)mentioning

confidence: 99%

Emerging Applications of Environmentally Friendly Zeolites in the Selective Catalytic Reduction of Nitrogen Oxides

Xie

Shi

2016

Green Chemistry and Sustainable Technology

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The catalytic removal of nitrogen oxides (NO x ) from diesel exhaust under oxygen-rich conditions remains a major challenge in the field of environmental catalysis, and the selective catalytic reduction of NO x with NH 3 (NH 3 -SCR), especially over zeolite catalysts, is a well-proven technique for the catalytic deNO x process for diesel vehicles. The comprehensive understanding of the structure-activity relationship of zeolite catalysts in the NH 3 -SCR reaction and the elucidation of the detailed reaction mechanism are very important for the practical use of these catalytic materials. In this chapter, using the environmentally friendly Fe-and Cu-based zeolite catalysts (i.e. Fe-ZSM-5, Cu-ZSM-5, Cu-SSZ-13 and Cu-SAPO-34, etc.) as examples, the influence of preparation methods on NH 3 -SCR performance, the role of metal active sites/surface acid sites, the impact of NO 2 and co-existing pollutants, the hydrothermal stability and also the possible SCR reaction pathways over these materials are discussed in detail, which can provide theoretical and empirical guidance for the redesign and activity improvement of these catalysts in their practical applications.

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Die direkte katalytische Oxidation von Methan zu Methanol – eine kritische Beurteilung

2017

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Es gibt vielzählige direkte, selektive Ansätze, um Methan partiell zu oxidieren, jedoch ist noch keiner von ihnen zur industriellen Reife gelangt. In diesem Zusammenhang ist die Oxidation von Methan zu Methanol eine schwierige, aber lohnende Aufgabe, da sie eine wirkungsvolle Methode ist, um das Abfackeln von Erdgas, das als Nebenprodukt in der Erdölindustrie anfällt, zu unterbinden, und zugleich die Möglichkeit bietet, Methan zu valorisieren. Dieser Aufsatz berücksichtigt die Synthese von Methanol und seinen Derivaten ausgehend von Methan durch homogen‐ und heterogenkatalytische Methoden. Er zeigt die starken Einschränkungen der direkten katalytischen Synthese von Methanol aus Methan auf und unterstreicht dabei die enorme Überlegenheit von Systemen, die Methanolderivate produzieren oder sich durch Besonderheiten wie die Verwendung von Mehrkomponenten‐Katalysatoren zur Methanolstabilisierung auszeichnen. Für die zukünftige Forschung erweist sich die Stabilisierung von Methanol in der homogenen und heterogenen Katalyse als unentbehrlich.

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

Cited by 165 publications

References 57 publications

Spectroscopic Evidence of Extra-Framework Heterometallic Oxo-Clusters in Fe/Ga-ZSM-5 Catalysts

Spectroscopic Evidence of Extra-Framework Heterometallic Oxo-Clusters in Fe/Ga-ZSM-5 Catalysts

Emerging Applications of Environmentally Friendly Zeolites in the Selective Catalytic Reduction of Nitrogen Oxides

Die direkte katalytische Oxidation von Methan zu Methanol – eine kritische Beurteilung

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