The results of studying Fischer–Tropsch synthesis in the presence of cobalt catalysts based on pelletized HZSM-5, HMOR, and HY zeolites with a micro–meso–macroporous structure were described. Physicochemical and catalytic properties were studied for samples with a cobalt content of 6 and 12 wt %. The phase composition parameters of the catalysts, the structural characteristics of the active component, and the cobalt reduction pattern were determined. The activity and selectivity parameters of the catalysts were studied in a fixed-bed reactor in a continuous mode at a pressure of 2.0 MPa, a gas hourly space velocity of 1000 h−1, and a temperature of 240–250°C. It was found that the active phase of the catalyst consists of crystals with varying sizes depending on the type of used zeolite and the cobalt content; this factor, in turn, affects the reduction temperature, activity, and selectivity to the fuel fractions of the resulting synthesis products. The samples based on the pelletized HMORh zeolite are characterized by maximum activity and productivity; the highest stability is exhibited by the catalysts based on the pelletized HYh zeolite. The diesel fraction of products synthesized in the presence of 6Co/HZSM-5h and 12Co/HMORh has the best low-temperature characteristics.
Sulima et al. (Wed,) studied this question.