Molecular Models of the Stabilization of Bivalent Metal Cations in Zeolite Catalysts

Zhidomirov, G. M.; Шубин, А. Б.; Larin, A. V.; Malykhin, S. E.; Rybakov, Andrey A.

doi:10.1007/978-94-007-0919-5_20

Cited by 2 publications

(1 citation statement)

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“…• . An α-oxygen center in Fe-ZSM-5 is also postulated as a bis(µ-oxo)di-iron(IV) unit that acts as the DMTM active moiety in this catalyst [57][58][59]. The presence of these active centers results in irreversible consumption of methane on the catalyst surface at room temperature, forming methoxy species which strongly bind to the surface.…”

Section: Bio-mimetic Zeolites: H 2 So 4 H 2 O 2 and N 2 Omentioning

confidence: 99%

Approaches for Selective Oxidation of Methane to Methanol

et al. 2020

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Methane activation chemistry, despite being widely reported in literature, remains to date a subject of debate. The challenges in this reaction are not limited to methane activation but extend to stabilization of the intermediate species. The low C-H dissociation energy of intermediates vs. reactants leads to CO2 formation. For selective oxidation, nature presents methane monooxygenase as a benchmark. This enzyme selectively consumes methane by breaking it down into methanol. To assemble an active site similar to monooxygenase, the literature reports Cu-ZSM-5, Fe-ZSM-5, and Cu-MOR, using zeolites and systems like CeO2/Cu2O/Cu. However, the trade-off between methane activation and methanol selectivity remains a challenge. Density functional theory (DFT) calculations and spectroscopic studies indicate catalyst reducibility, oxygen mobility, and water as co-feed as primary factors that can assist in enabling higher selectivity. The use of chemical looping can further improve selectivity. However, in all systems, improvements in productivity per cycle are required in order to meet the economical/industrial standards.

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Section: Bio-mimetic Zeolites: H 2 So 4 H 2 O 2 and N 2 Omentioning

confidence: 99%