The isomerization-disproportionation conversion of straight-run gasoline over the Co/HZSM/SO₄^2--ZrO₂ (SZ) composite catalytic system at atmospheric hydrogen pressure has been studied. Optimal process conditions (180⁰С; Н₂/СН=3; WHSV = 2.5 h^-1) was established, under which the conversion of С₈₊ hydrocarbons is 77.3%, and the sum of high-octane gasoline components С₅–С₆ alkanes increases from 11% to 61%. Тhe effect of C_4-, C₅–C₆ products and H₂O on this isomerization-disproportionation process have been studied. It is shown that, unlike the main C₅–C₆ products, side C₄-products affect the stability of the process, and the catalyst is deactivated under the water's influence. Comparative studies of the conversion of a mixture of straight-run gasoline and C₂H₅OH showed that H₂O vapor formed sites deactivate the centers located on the SZ. It has been established that the mechanism of isomerization-disproportionation conversion of straight-run gasoline with the participation of a composite catalytic system is realized through the conjugated interaction of red-ox centers contained on SZ with acid-base centers of Co/HZSM-5, responsible, respectively, for the formation of intermediate compounds [С₄+C₇] and their and their further hydro cleavage

doi.org/10.32737/0005-2531-2022-2-28-33