Active-oxygen species on non-reducible rare-earth-oxide-based catalysts in oxidative coupling of methane

From supplementary in situ Raman spectroscopic studies of active-oxygen species on non-reducible rare-earth-oxide-based catalysts in the oxidative coupling of methane (OCM) and structural adaptability considerations, further support has been obtained for our proposal that there may be an active and...

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Veröffentlicht in:Catalysis letters 2001-01, Vol.73 (2-4), p.141-147
Hauptverfasser: ZHANG, H. B, LIN, G. D, WAN, H. L, LIU, Y. D, WENG, W. Z, CAI, J. X, SHEN, Y. F, TSAI, K. R
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container_end_page 147
container_issue 2-4
container_start_page 141
container_title Catalysis letters
container_volume 73
creator ZHANG, H. B
LIN, G. D
WAN, H. L
LIU, Y. D
WENG, W. Z
CAI, J. X
SHEN, Y. F
TSAI, K. R
description From supplementary in situ Raman spectroscopic studies of active-oxygen species on non-reducible rare-earth-oxide-based catalysts in the oxidative coupling of methane (OCM) and structural adaptability considerations, further support has been obtained for our proposal that there may be an active and elusive precursor (of O 2− and O 22− adspecies), most probably O 32− formed from reversible redox coupling of an O2 adspecies at an anionic vacancy with a neighboring O2− in the surface lattice. This active precursor may initiate H abstraction from CH4 and be itself converted to OH−+O 2−, or it may abstract an electron from the oxide lattice and be converted to O 22−+O−. The prospect of developing this type of OCM catalysts is discussed.
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source Springer Online Journals
subjects Catalysis
Catalysts
Catalysts: preparations and properties
Chemistry
Coupling
Exact sciences and technology
General and physical chemistry
Lattice vacancies
Methane
Precursors
Rare earth compounds
Rare earth elements
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
title Active-oxygen species on non-reducible rare-earth-oxide-based catalysts in oxidative coupling of methane
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