Transformation of olefin-containing raw material from the catalytic cracking unit of the Heydar Aliyev Oil Refinery was studied in the presence of zirconium-containing catalyst 5% Zr/KN-4/Al₂O₃ over a wide temperature range (T= 160-550ºC), feed rate V=500h^-1 and contact time τ=1-6 h in a continuous-flow laboratory setup with a fixed-bed catalyst under atmospheric pressure. Raw material and reaction products were analyzed on Perkin Elmer AutoSystem XL chromatograph. IR spectra of the resulting catalytic products were recorded on a BRUKER ALPHA FTIR spectrometer (Germany) in the wavenumber range 600-4000 cm^-1. It was established, that the 5% Zr/KN-4/Al₂O₃ catalyst exhibits both oligomerization activity in the temperature range of 180-220ºC, forming high-octane components Σ(C₅-C₈), and aromatization activity at elevated temperatures from 300 to 550ºC, producing BTX (benzene, toluene, xylenes) fractions. The yield of total aromatic hydrocarbons (ΣArH) reaches 46.8 wt.% with a selectivity of 58.7% during aromatization of the butane-butylene fraction at 530ºC. During the conversion of the studied gases at 220ºC, the raw material conversion is 61.5 wt.% with the following selectivities by fraction: ΣC₅-C₆–58.5%, ΣC₇–30.4%, ΣC₈–10.5%. IR spectroscopic studies of the obtained liquid reaction products showed the absence of absorption bands at 1640 cm^-1 characteristic for C=C bonds in olefins. However, the presence of absorption bands at 1376 cm^-1 and 1456 cm^-1 indicates a branched structure of the resulting oligomers. An increase in temperature from 180 to 550°C causes an increase in the optical density of C–C bond in the benzene ring and reaches the maximum value at 500°C (0.034).

doi.org/10.32737/0005-2531-2026-1-5-12