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In situ time-resolved FTIR investigation on the reaction mechanism of partial oxidation of methane to syngas over supported Rh and Ru catalysts

Chinese Science Bulletin, ISSN: 1001-6538, Vol: 45, Issue: 24, Page: 2236-2240
2000
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In situ time-resolved FTIR spectroscopy was used to study the reaction mechanism of partial oxidation of methane (POM) to synthesis gas and the reaction of CH/O/He (2/1/45, molar ratio) gas mixture with adsorbed CO species over Rh/SiO, Ru/γ-AlO and Ru/SiO catalysts at 500-600°C. It was found that CO is the primary product of POM reaction over reduced and working state Rh/SiO catalysts. Direct oxidation of CH is the main pathway of synthesis gas formation over Rh/SiO catalyst. CO is the primary product of POM over Ru/γ-AlO and Ru/SiO catalysts. The dominant reaction pathway for synthesis gas formation over Ru/γ-AlO catalyst is via the reforming reactions of CH with CO and HO. For the POM reaction over Rh/SiO and Ru/γ-AlO catalysts, consecutive oxidation of surface CO species is an important pathway of CO formation.

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