The continuous depletion of conventional oil reserves and the increasing geological complexity of newly explored hydrocarbon basins necessitate the implementation of advanced refining strategies. As heavier and more heterogeneous oil resources become dominant in the global energy landscape, the development of efficient, selective, and sustainable conversion technologies is becoming critically important. The growing complexity of hydrocarbon raw materials, the exhaustion of light raw oil reserves and the growing demand for environmentally friendly refining methods requires the development of innovative technologies in oil processing. Traditional thermal and catalytic processes often fail in terms of selectivity, energy efficiency and environmental safety. In this context, catalytic oxycracking appears as a promising alternative for processing heavy oil fractions, such as vacuum gas oil. This process not only provides a deeper converting of hydrocarbons, but also allows you to generate oxygen content with added value with potential applications in petrochemistry and alternative fuel synthesis. The study investigates the process of catalytic oxycracking of vacuum gas oil in the presence of zeolite-containing catalysts modified with transition metal oxides. The composition of oxygen-containing compounds formed in the liquid products of oxycracking has been analyzed. It was established that the highest yield of oxygen-containing compounds is achieved when using catalysts containing cadmium, cobalt, and copper, which is attributed to their high oxidative activity. A correlation has been identified between the nature of the modifier and its selectivity towards various classes of oxygen-containing compounds such as oxo-compounds, alcohols, peroxides, acids, and esters. Their molecular structures have been determined. It has been shown that the manifestation of high catalytic activity toward oxygen-containing compounds under oxycracking conditions is associated with the occurrence of catalysis within the domain of intrinsic conductivity. Differences in selectivity and quantitative content of individual classes of oxygen-containing compounds may be related to the formation of different intermediate complexes on catalytically similar systems. The influence of catalyst modification on the yield and molecular weight of oxygen-containing compounds has been studied. The obtained results may contribute to a deeper understanding of the catalytic oxycracking mechanism and to the improvement of its technological parameters.