Development of Zeolite Doped Cobalt Based Catalysts for Producing Isoparaffins from Syngas
Co/ZrO2 catalyst precursor was prepared by coprecipitation method.After spray drying,stable H-ZSM-5 zeolite was grown on the spherical Co/ZrO2 catalyst precursor by hydrothermal method,and Co/ZrO2-H-ZSM-5 catalyst was prepared after calcination.XRD characterizations showed that the characteristic peak of Co3O4 remain and the particle size did not change after doping,and the characteristic peak of H-ZSM-5 appeared obviously.BET characterization showed that surface area increased with the increase of doped zeolite content.HRTEM results illuminated that H-ZSM-5 zeolite with regular morphology adsorbed on Co/ZrO2 catalysts.Testing results of H2-TPR and NH3-TPD showed that doped H-ZSM-5 zeolite resulted in a slight reduction in the reducibility but an increase in the acid site strength of the catalyst.The results of catalytic performance evaluation of Fischer-Tropsch synthesis in the fixed-bed reactor also showed that the longer chain hydrocarbons produced by CO hydrogenation was cracked and isomerized in the acidic H-ZSM-5 zeolite,and thus improved the selectivity of isoparaffins.
fischer-tropsch synthesiscobalt based catalystsisoparraffinsselectivity
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