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This invention relates to a cobalt-based catalyst on a metal structure for selective production of synthetic oil via Fischer-Tropsch reaction, a method of preparing the same and a method of selectively producing synthetic oil using the same, wherein zeolite, cobalt and a support are mixed and ground

This invention relates to a cobalt-based catalyst on a metal structure for selective production of synthetic oil via Fischer-Tropsch reaction, a method of preparing the same and a method of selectively producing synthetic oil using the same, wherein zeolite, cobalt and a support are mixed and ground to give a catalyst sol, which is then uniformly thinly applied on the surface of a metal structure using a spray-coating process, thereby preventing generation of heat during Fischer-Tropsch reaction and selectively producing synthetic oil having a carbon chain shorter than that of wax. This catalyst is prepared by burning a powder mixture obtained by melt infiltration of a cobalt hydrate and a metal oxide support to give a catalyst powder including cobalt oxide/metal oxide support; hybridizing the catalyst powder including cobalt oxide/metal oxide support with a zeolite powder to give a hybrid catalyst powder; mixing the hybrid catalyst powder with an organic binder and an inorganic binder and grinding the mixed hybrid catalyst powder to give a hybrid catalyst sol; spray-coating a metal structure surface-treated with alumina by atomic layer deposition with the hybrid catalyst sol; and thermally treating the metal structure spray-coated with the hybrid catalyst sol.

대표청구항 ▼

1. A method of preparing a cobalt-based catalyst on a metal structure for selective production of a synthetic oil via Fischer-Tropsch reaction, comprising: burning a powder mixture obtained by melt infiltration of a cobalt hydrate and a metal oxide support to give a catalyst powder comprising cobalt

1. A method of preparing a cobalt-based catalyst on a metal structure for selective production of a synthetic oil via Fischer-Tropsch reaction, comprising: burning a powder mixture obtained by melt infiltration of a cobalt hydrate and a metal oxide support to give a catalyst powder comprising cobalt oxide/metal oxide support;hybridizing the catalyst powder comprising cobalt oxide/metal oxide support with a zeolite powder to give a hybrid catalyst powder;mixing the hybrid catalyst powder with an organic binder and an inorganic binder and grinding the mixed hybrid catalyst powder to give a hybrid catalyst sol;spray-coating a metal structure surface-treated with alumina by atomic layer deposition with the hybrid catalyst sol; andthermally treating the metal structure spray-coated with the hybrid catalyst sol. 2. The method of claim 1, wherein mixing the hybrid catalyst powder with the organic binder and the inorganic binder and grinding the mixed hybrid catalyst powder to give the hybrid catalyst sol comprises preparing a hybrid catalyst sol further comprising ruthenium. 3. The method of claim 2, wherein the ruthenium is contained in an amount of 1˜5 wt % based on a total weight of a catalyst comprising cobalt oxide/ruthenium/metal oxide support obtained by dissolving a ruthenium salt in a hybrid catalyst sol solution, coating the metal structure with the hybrid catalyst sol, and performing burning and thermal treatment to result in decomposition. 4. The method of claim 1, wherein the cobalt hydrate is any one selected from among Co(NO3)26H2O (m.p.=55° C.), CoCl26H2O (m.p.=86° C.), and CoSO47H2O (m.p.=96.8° C.). 5. The method of claim 1, wherein the cobalt oxide is loaded in an amount of 15˜40 wt % based on a total weight of the catalyst comprising the metal oxide support that is thermally decomposed at a high temperature after infiltration. 6. The method of claim 1, wherein the metal oxide support is a porous silica or alumina having a pore volume of 0.4 cm3/g or more and an effective surface area of 100 m2/g or more. 7. The method of claim 1, wherein the burning is performed by thermal treatment at 300˜500° C. in an atmosphere, thus obtaining cobalt oxide particles having a size of 5˜50 nm. 8. The method of claim 1, wherein the melt infiltration is performed for 1˜48 hr in a closed system at a temperature 2˜5° C. higher than a melting point of the cobalt hydrate. 9. The method of claim 1, wherein the zeolite is added such that an amount thereof is 5˜30 wt % based on a total weight of the hybrid catalyst. 10. The method of claim 1, wherein the hybrid catalyst sol is prepared in such a manner that the hybrid catalyst powder is added in an amount of 1˜10 wt % to a dispersion solution comprising the organic binder, the inorganic binder and a solvent mixture of distilled water and ethanol, ground to a size of 900 nm or less and dispersed. 11. The method of claim 10, wherein the organic binder is PVB (Polyvinyl butyral), PVP (Polyvinylpyrrolidone) or PVA (Polyvinyl alcohol), and the inorganic binder is alumina sol or silica sol. 12. The method of claim 1, wherein the metal structure comprises nickel, copper or a combination of nickel and copper, with a pore size of 1.2˜0.45 mm. 13. The method of claim 1, wherein the atomic layer deposition is performed a total of 60˜100 cycles at a substrate temperature of 120° C. so that alumina has a thickness of 12˜20 nm. 14. The method of claim 1, wherein the hybrid catalyst sol is sprayed on the metal structure at a rate of 1˜10 mL/sec upon spray-coating, so that an amount of loaded hybrid catalyst sol per an area of the metal structure is 4˜40 mg/cm2. 15. The method of claim 14, wherein a temperature of a support plate for supporting a bottom of the metal structure is maintained at 40˜90° C.