In present study, the catalytic pyrolysis of hydrocarbon feedstock in the presence of a regenerated microspherical zeolite-containing catalyst was investigated. Two industrially important feedstocks—straight-run gasoline and vacuum gas oil—were selected as the objects of study. The process was carried out in a flow-type laboratory reactor within the temperature range of 600–700 °C. It was established that the presence of the catalyst significantly enhances the degree of gasification and increases the yield of C₂–C₄ olefins, particularly propylene. Based on the obtained results, the optimal temperature regime was determined and the technological efficiency of the process was evaluated.