Abstract
In situ microprobe Raman and XRD techniques were used to follow the oxidation state of Rh/Al 2O 3 and Ru/Al 2O 3 catalysts during the catalytic ignition process of the partial oxidation of methane (POM) to synthesis gas. It was found that the catalyst was in the fully oxidized state before ignition of the POM reaction, and abruptly changed its oxidation state at the temperature at which the POM reaction started. After the POM reaction was ignited, the amount of Rh 2O 3 or RuO 2 in the catalyst at the entrance of the catalyst bed was below the detection level of Raman spectroscopy. Due to the greater M O bond strength of Ru O compared with Rh O, Ru/Al 2O 3 demonstrated a greater tendency to oxidize than Rh/Al 2O 3 under the POM conditions. This factor affects the oxygen coverage on the two catalysts under reaction conditions and consequently affects the pathways of synthesis gas formation.
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