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Partial oxidation of methane to synthesis gas over a Pt/10% Rh gauze

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Abstract

The partial oxidation of methane to synthesis gas has been studied over a Pt/10% Rh gauze catalyst. The experiments were carried out at atmospheric pressure using a single gauze in a quartz reactor heated in an electric furnace. The furnace temperature was varied in the range 200--1050°C and the space time in the range 0.00015--0.0005 s. The feed consisted of a mixture of CH4 : O2 : ≈2 : 1 : 10 and oxygen was only partly consumed. The products were carbon oxides, water, hydrogen and traces of C2-hydrocarbons with compositions far from equilibrium. Compared to a Pt metal gauze a higher methane conversion and more favourable selectivities of synthesis gas, and in particular of H2, were obtained at similar furnace temperatures. The Pt/10% Rh gauze showed a better stability with time on stream compared to the Pt gauze. No loss of metal was observed from the Pt/10% Rh gauze after 8 h on stream. The oxidation reactions were studied separately from steam reforming and the water-gas shift reaction at temperatures up to 1050°C at a space time of 0.00021 s. At 960°C the results indicate that CO and H2 are formed beside H2O as primary products.

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Authors
  1. K. Heitnes Hofstad
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  2. T. Sperle
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  3. O.A. Rokstad
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  4. A. Holmen
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Heitnes Hofstad, K., Sperle, T., Rokstad, O. et al. Partial oxidation of methane to synthesis gas over a Pt/10% Rh gauze. Catalysis Letters 45, 97–105 (1997). https://doi.org/10.1023/A:1019030604516

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