Fischer-Tropsch synthesis catalysts based on granular, binder-free zeolites with a hierarchical porous structure

The results of studies of the Fischer-Tropsch synthesis on cobalt catalysts prepared on the basis of granular zeolites HZSM-5, HMOR, HY with a hierarchical porous structure are presented. Physicochemical and catalytic properties were studied for samples with cobalt contents of 6 and 12 wt. %. The phase composition of the catalysts and the structural characteristics of the active component, as well as the nature of cobalt reduction, were determined. The activity and selectivity parameters of the catalysts were studied in a fixed-bed reactor in continuous mode at a pressure of 2.0 MPa, a gas space velocity of 1000 h –1 , and a temperature of 240-250 °C. It has been established that, depending on the type of zeolite used and the cobalt content, the active phase of the catalyst consists of crystals of different sizes, which, in turn, affects the reduction temperature, activity and selectivity in relation to the fuel fractions of the resulting synthesis products. Samples based on granulated zeolite HMOR h are characterized by maximum activity and productivity; catalysts based on granulated zeolite HY h demonstrate the greatest stability. The diesel fraction of products obtained from samples 6Co/HZSM-5 h and 12Co/HMOR h has the best low-temperature characteristics.