A method for producing hydrocarbons by the Fischer-Tropsch process

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PROBLEM TO BE SOLVED : To provide a method for producing hydrocarbons from a synthesis gas, having high chain growth probability, high olefin selectivity, high catalytic activity, high carbon monoxide conversion and improved catalyst life, and enabling a stable and smooth reaction to be performed without e.g. causing heat spots. SOLUTION : This method for producing hydrocarbons comprises the following process : a catalyst with each given specific surface area and catalyst particle size distribution prepared by bearing on a manganese oxide carrier with each specific amount of ruthenism and a compound of at least one metal selected from alkali metals, alkaline earth metals, rare earth metals and group III metals in the periodical table of elements is put to reducing treatment in advance, and then dispersed at a given concentration in a liquid hydrocarbon, and a mixed gas consisting mainly of hydrogen and carbon monoxide is contacted with the catalyst at each given pressure and reaction temperature.