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SiO₂-Modified Al₂O₃@Al-Supported Cobalt for Fischer–Tropsch Synthesis: Improved Catalytic Performance and Intensified Heat Transfer

Wang, Da, Wang, Zhong, Li, Guangci, Li, Xuebing, Hou, Bo
Industrial & engineering chemistry process design and development 2018 v.57 no.38 pp. 12756-12765
Fischer-Tropsch reaction, carbon monoxide, catalysts, catalytic activity, cobalt, heat transfer, heat transfer coefficient, methane, process design, silica, temperature, thermal conductivity
SiO₂-modified high thermal conductivity Al₂O₃@Al composites were synthesized and supported cobalt for Fischer–Tropsch synthesis to improve the catalytic performance and intensify the heat transfer within a fixed-bed reactor. FTS results showed that the CO conversion and C₅₊ selectivity increased whereas CH₄ selectivity decreased, which could be attributed to the reduced metal–support interaction via modification of SiO₂ on the surface of Al₂O₃@Al. The heat transfer coefficients of the Co/SAl₂O₃@Al–x were more than 30 times those of conventional Co/Al₂O₃ according to the laser flash measurement. The thermal conductive study showed that a homogeneous radial temperature gradient was maintained within the catalyst bed for Co/SAl₂O₃@Al-x even without using a heat diluter, indicating good thermal conductivity within the reactor. In addition, the temperature of the catalyst bed for Co/SAl₂O₃@Al-x was easier to reach a “steady state” compared to the reactor packed with traditional low thermal conductive Co/Al₂O₃, which could improve the operating flexibility of FTS.