Methanation Activity of Tungsten Catalysts in the Presence of Hydrogen Sulfide at an Elevated Temperature

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In the presence of hydrogen sulfide, the methanation activity and active species of tungsten catalysts were studied under the conditions of 650°C, 70 kg/cm2 and SV=15, 000 hr-1. Metallic tungsten scarcely showed catalytic activity at temperatures of 400 to 500°C. However, when the reaction was carried out at the higher temperature of 650°C, metallic tungsten was gradually converted into two kinds of tungsten carbides during the reaction by the action of reactant gases, and consequently the activity for the formation of methane was increased. The resulted tungsten carbides exhibited stable activity, even in the presence of 160ppm of hydrogen sulfide, for longer than 400 hrs without any coking troubles. An X-ray study of the catalyst used for longer than 400 hrs showed that it consisted of carbide (WC) and tungsten a small amount of tungsten disulfide (WS2).
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