Synthesis and Characterization of Co-Ru@NC- MOF, Co-Ru@ ZSM-5 and Co-Ru@ ɤ- Al 2 O 3 , Composite Catalysts – An Applications in Fischer-Tropsch Synthesis

Abstract In this work, we synthesized the metal-organic framework ZIF-67 (MOF) by the hydrothermal method. The XRD spectrum of this MOF was consistent with the spectrum given in the literature, which indicated the successful synthesis of ZIF-67. Following the calcination process of the MOF, ruthenium metal was added to the catalyst as a promoter by impregnation method to synthesize Co-Ru@NC composite catalyst. In addition, we synthesized the Co-Ru@ZSM-5 and Co-Ru@ɤ-Al2O3 catalysts by the impregnation method. We performed the characterization tests such as atomic absorption, EDX, ESEM, TEM, BET, XRD, and H2-TPR to find out the surface and volume of the catalysts, formed phase, reduction temperature, hydrogen consumption, and catalyst morphology. Moreover, we carried out Fischer-Tropsch Synthesis (FTS) to obtain the CO conversion, hydrocarbon product selectivity, hydrocarbon chain growth probability, and reaction yield using the synthesized catalysts. The results of using three catalysts showed that the CO conversion, and selectivity to methane and C2 − 4 hydrocarbons enhanced with increasing temperature from 210 to 230°C. On the other hand, the C5+ selectivity and hydrocarbon chain growth probability (α) were reduced by increasing temperature. By the use of the Co-Ru@NC catalyst, the maximum C5+ selectivity, and the minimum CH4, CO2, and C2 − 4 selectivity were 93.85%, 4.89%, 0.010%, and 1.25%, respectively. The probability of heavy hydrocarbon chain growth is higher for the Co-Ru@NC catalyst than for the other two catalysts. The maximum C5+ selectivity for Co-Ru@ZSM-5 and Co-Ru@ɤ-Al2O3 catalysts at 210°C are 80.27% and 80.50%, respectively. The maximum CO conversion values ​​for the Co-Ru@NC, Co-Ru@ZSM-5, and Co-Ru@ɤ-Al2O3 catalysts at 230°C are 85.62%, 78.35%, and 72.74%, respectively. The increasing order of Fischer-Tropsch reaction yield for the synthesized catalysts was Co-Ru@NC > Co-Ru@ZSM-5 > Co-Ru@ɤ-Al2O3.