The studies were aimed at the development of hydroisomerization catalysts based on nanosize molybdenum carbides. These catalysts were expected to be resistant to sulfur compounds and applicable for synthesis of low pour point diesel fuels similar in parameters to the fuel synthesized over platinum catalysts. Part I dealt with synthesis and characterization of supports with different porous structures and acidities (Beta, ZSM-5, ZSM-12, SAPO-31). Part 2 of the work was devoted to studies of bifunctional catalysts prepared by modifying these supports with nanosize molybdenum carbides. All the samples bore identical amounts of Mo2C (10 % expressed in terms of the equivalent amount of MoO3). The catalysts were tested using a model reaction of isomerization of n-decane. The catalyst based on silicoaluminophosphate ATO (SAPO-31) was most active to isomerization. Larger batches of the catalysts with different Mo2C contents (5, 7 and 10 expressed in terms of the equivalent amount of MoO3) were prepared to optimize the composition. The catalytic properties were studied using hydroisomerization of actual diesel fractions. The optimal content of Mo2C (7 wt %) in the bifunctional catalyst was determined.