The paper presents the results of studying the accumulation of organometallic
compounds on the surface of a zeolite-containing catalyst (ZCC) during the catalytic
oxycracking of heavy hydrocarbon raw materials. The aim of the study was to determine the
nature and degree of accumulation of trace elements that can affect the activity and stability of
the catalyst. The experiments were carried out at a temperature of 500 °C, an oxygen
concentration of 1 %, a contact time of 1.2-2 s, and a process duration of 900 s. The elemental
composition of the catalyst surface before and after catalysis was studied by energy-dispersive
microanalysis (EDM). It is established that during the process, the accumulation of trace
elements Fe, Ni, Cr, and Ca occurs on the surface of the catalyst Ca, due to their migration
from the raw material. As the contact time increases, the Fe content increases to 2.3%, Cr to
0.1%, Ni to 0.04%, and Ca to 0.02 %. The obtained values are significantly lower than the
known critical levels at which the active sites of the catalyst are deactivated. This allows us to
conclude that the accumulation of metals on the surface of ZCCs is not the main reason for the
decrease in its activity during catalytic oxycracking, and decontamination is associated with
other factors that require further study