Abstract
Partial oxidation of methane to synthesis gas over 0.5 wt.% Pt/Al 2O 3 and 0.5 wt.% Pt/CeO 2 catalysts was studied in a packed-bed reactor and supplementary runs of methane reforming with carbon dioxide were carried out. Fresh and used catalysts were characterized by nitrogen adsorption (BET method) for total surface area, and by H 2 and CO chemisorption or by the rate of propene hydrogenation for metal surface area. At temperatures up to 650°C, the Pt/CeO 2 catalyst gave considerably higher methane conversion and higher selectivity to CO and H 2 but above 700°C, the activities and selectivities of both catalysts were comparable. The Pt/CeO 2 catalyst maintained high selectivity to CO and H 2 when the CH 4:O 2 feed ratio varied from 1.7 to 2.3 while the Pt/Al 2O 3 catalyst had lower activity and selectivity under methane-rich conditions. The Pt/CeO 2 catalyst was also more active for methane reforming by carbon dioxide.
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