This study investigates the production of diesel fuels by integrated\t\t\t\t\tFischer–Tropsch synthesis over a bifunctional cobalt catalyst consisting of a\t\t\t\t\tcobalt component\t\t\t\t\t\t(Co–Al2O3/SiO2)\t\t\t\t\tand a zeolite-containing component (ZSM-5). The catalytic properties were tested\t\t\t\t\tin a continuous-flow reactor with a stationary catalyst bed at 240–250°C, 2 MPa,\t\t\t\t\tand gas WHSV 1000 h–1. The effects of the\t\t\t\t\t\tSiO2/Al2O3\t\t\t\t\tratio in a HZSM-5 zeolite on the catalytic performance, catalyst deactivation\t\t\t\t\trate, and hydrocarbon and fractional compositions of the synthetic product were\t\t\t\t\tidentified. The low-temperature properties of the synthesized diesel fuel\t\t\t\t\tsatisfy the current requirements for winter fuels.