Synthesis of liquid fuel from natural gas and coal

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Recently it is pointed out to be necessary to development of new process for direct conversion of natural gas to chemical material. From the results of researches, C_2 hydrocarbo was found to be formed via methyl radicals in oxidative coupling of methane. In this case, th side reaction of methyl radical with oxygen in gas phase proceeded, therefore it is suggested t be the limitation of yield of C_2 hydrocarbons. In this study we investigated the formation of C_2 hydrocarbons from methane (a main component of natural gas) and carbon material (coal). We used coal char as the carbon material since amorphous carbon is favorable in terms of its reactivity. In our study we especially used Yallourn brown coal. On the reaction between Yallourn char and methane, the gas product was observed at higher temperature than 1273K But under the reaction condition on which methane was only feeded, large amount of coke w deposited on carbon surface. In order to avoid this coke deposition, we added hydrogen to methane flow. This is the utilization of hydrogen spillover phenomena from the combination of hydrogen gas and supporte metal, metal oxide and metal sulfided catalysts. It is possible to control of the concentration of hydrogen species on the carbon surface. From these experiment, it is observed that decrease of coke amount formed during reaction, and at the same time the decrease of methane conversion probably because the adsorption of hydrogen on the radical center of carbon surface which seems to be active site of dehydrogenative activation of methane.