Oxygen X-ray absorption near-edge structure characterization of the Ba-doped yttria oxidative coupling catalyst

Ba-doped Y 2O 3 is one of the most active catalysts for the oxidative coupling of methane. Here, based on measurements of the oxygen K-edge X-ray absorption edge, X-ray diffraction, X-ray fluorescence, and X-ray photoelectron spectroscopy and its catalytic activity and selectivity, we propose that t...

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Bibliographic Details
Published in:Journal of catalysis 1992-07, Vol.136 (1), p.16-23
Main Authors: Kaminsky, M.P., Zajac, G.W., Campuzano, J.C., Faizt, M., Beaulaigue, L., Gofron, K., Jenningst, G., Yao, J.M., Saldin, D.K.
Format: Article
Language:English
Subjects:
03 NATURAL GAS
030300 - Natural Gas- Drilling, Production, & Processing
400201 - Chemical & Physicochemical Properties
ABSORPTION SPECTROSCOPY
ALKALINE EARTH METALS
ALKANES
ALKENES
BARIUM
Catalysis
CATALYSTS
Catalysts: preparations and properties
CATALYTIC EFFECTS
CATALYTIC REFORMING
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
Chemistry
COHERENT SCATTERING
CRYSTAL STRUCTURE
DIFFRACTION
ELECTRON SPECTROSCOPY
ELEMENTS
ETHYLENE
Exact sciences and technology
General and physical chemistry
HYDROCARBONS
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
METALS
METHANE
MICROSTRUCTURE
NONDESTRUCTIVE ANALYSIS
ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PHOTOELECTRON SPECTROSCOPY
REFORMER PROCESSES
SCATTERING
SPECTROSCOPY
SURFACE PROPERTIES
SYNTHESIS
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
TRANSITION ELEMENT COMPOUNDS
X-RAY DIFFRACTION
X-RAY EMISSION ANALYSIS
X-RAY FLUORESCENCE ANALYSIS
X-RAY SPECTROSCOPY
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
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Description
Summary:Ba-doped Y 2O 3 is one of the most active catalysts for the oxidative coupling of methane. Here, based on measurements of the oxygen K-edge X-ray absorption edge, X-ray diffraction, X-ray fluorescence, and X-ray photoelectron spectroscopy and its catalytic activity and selectivity, we propose that the active sites are charge-deficient oxygen sites created as Bat+ substitutes into Y 3+ lattice sites. The substitution is temperature dependent, becoming significant only at higher temperatures. We have found a correlation of catalytic activity and selectivity as a function of Ba loading on Y203. This is reflected in the oxygen K-edge absorption near the absorption edge.
ISSN:0021-9517
1090-2694
DOI:10.1016/0021-9517(92)90102-N