Fischer-tropsch synthesis catalyst, manufacturing method therefor, and hydrocarbon manufacturing method

Abstract

A Fischer-Tropsch synthesis catalyst containing 10 to 30% by mass, as a metal atom, of metallic cobalt and/or cobalt oxide, based on the mass of the catalyst, supported on a carrier containing silica, in which the carrier has an average pore diameter of 8 to 25 nm and the metallic cobalt and/or cobalt oxide has an average crystallite diameter of not less than the average pore diameter of the carrier and less than 35 nm.

1 . A Fischer-Tropsch synthesis catalyst comprising 10 to 30% by mass, as a metal atom, of metallic cobalt and/or cobalt oxide, based on the mass of the catalyst, supported on a carrier containing silica, wherein
 the carrier has an average pore diameter of 8 to 25 nm, and   the metallic cobalt and/or cobalt oxide has an average crystallite diameter of not less than the average pore diameter of the carrier and less than 35 nm.   
     
     
         2 . The Fischer-Tropsch synthesis catalyst according to  claim 1 , wherein a cobalt atom/silicon atom molar ratio measured by an X-ray photoelectron spectroscopy is 0.05 to 2.00. 
     
     
         3 . The Fischer-Tropsch synthesis catalyst according to  claim 1 , further comprising 0.5 to 10% by mass of zirconium as zirconium oxide, based on the mass of the catalyst. 
     
     
         4 . A method for producing the Fischer-Tropsch synthesis catalyst according to  claim 1  comprising:
 a step of loading an active metal for loading a cobalt compound on a carrier containing silica having an average pore diameter of 8 to 25 nm so that the loading amount of the cobalt compound as a cobalt atom becomes 10 to 30% by mass, based on the mass of the catalyst; 
 a step of calcining for calcining the carrier supporting the cobalt compound to obtain a catalyst precursor in which the cobalt compound is converted into cobalt oxide; 
 a step of first reduction for reducing the catalyst precursor in an atmosphere containing at least molecular hydrogen to obtain a reduced catalyst precursor; and 
 a step of steaming for treating the reduced catalyst precursor obtained through the step of first reduction with a mixed gas containing 1 to 30% by volume of steam and an inert gas at a temperature of 100 to 300° C. to obtain a Fischer-Tropsch synthesis catalyst. 
 
     
     
         5 . The method for producing the Fischer-Tropsch synthesis catalyst according to  claim 4 , comprising:
 a step of loading zirconium for loading 0.5 to 10% by mass of zirconium as zirconium oxide, based on the mass of the catalyst, on particles containing silica having an average pore diameter of 8 to 25 nm; and   a step of calcining a carrier for calcining the zirconium-loaded particles containing silica to obtain a carrier containing silica before the step of loading an active metal.   
     
     
         6 . The method for producing the Fischer-Tropsch synthesis catalyst according to  claim 4 , comprising a step of second reduction for further reducing the Fischer-Tropsch synthesis catalyst obtained through the step of steaming in an atmosphere containing molecular hydrogen or carbon monoxide. 
     
     
         7 . A method for producing hydrocarbons by subjecting a feedstock containing carbon monoxide and molecular hydrogen to the Fischer-Tropsch synthesis reaction in the presence of the Fischer-Tropsch synthesis catalyst according to  claim 1  to synthesize hydrocarbons.