Catalytic conversion of methane to synthesis gas over europium iridate,Eu2Ir2O7: Anin situ study by x-ray diffraction and mass spectrometry |
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| Authors: | Richard H Jones Alexander T Ashcroft David Waller Anthony K Cheetham John M Thomas |
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| Affiliation: | (1) Davy Faraday Research Laboratory, The Royal Institution of Great Britain, 21 Albemarle St., W1X4BS London, UK;(2) Chemical Crystallography Laboratory, University of Oxford, 9 Parks Rd, OX1 3PD Oxford, UK |
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| Abstract: | The selective partial oxidation of methane over the europium iridium pyrochlore, Eu2Ir2O7, has been studiedin situ by using powder X-ray diffraction and mass spectrometry. At a temperature of 873 K and 1 atmosphere pressure, with a CH4 O2 ratio of 21 under argon dilution, high yields of synthesis gas are obtained. The pyrochlore structure of the iridate is modified during the initiation of the catalyst, giving an active solid that is shown to comprise particles of iridium metal,  30 Å in diameter, supported on europium oxide, Eu2O3. The modification of the pyrochlore structure was monitored by X-ray diffraction, and the product gases were continuously analysed by mass spectrometry. |
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| Keywords: | Methane oxidation synthesis gas europium iridate pyrochlore iridium in-situ |
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