MODIFIED ZEOLITE CATALYSTS FOR EFFICIENT PROCESSING OF N-HEXANE AND GASOLINE FRACTION

In this work hydrogen-free processing (in the absence of hydrogen) and hydrotreating of n-hexane and straight-run petrol fraction on the catalysts samples “C-1” (La-ZSM-Al2O3) and “C-2” (Ni-Mo-La-P-ZSM-Al2O3) were studied. “C-2” catalyst has high activity in both studied processes. The conversion of n-hexane during hydrogen-free processing on the “C-2” catalyst in the range of 350-500ºC increased from 58.8 to 90.7%; the octane rating of the final product in the temperature range of 350-500 ºC was within 55.1-87.9 according to the research method (RM), and from 61.4 to 84.9 according to the motor method (MM). The octane rating of hydrotreating products increases mainly due to an increase in the content of isoalkanes. The octane rating of the resulting gasoline is significantly higher than that of the original straight-run gasoline (73.1 (RM), 54.1 (MM)), and it reaches 92.1 (RM) and 81.7 (MM). The surface of the developed catalysts is within 201.10-252.20 m2 /g of the catalyst. The catalysts have pores with d ≈ 1.5– 3.65 nm. The highest concentration of acid sites with medium binding energy is typical for the “C-2” catalyst and determines its high hydroisomerizing activity in the processes of hydrotreating of n-hexane and gasoline fraction. Thus, multifunctional modified zeolite-containing catalysts for hydrotreating gasoline fractions have been developed, which make it possible to simultaneously carry out the processes of hydrotreating, hydroisomerization, and hydrocracking in one stage, as well as to obtain environmentally friendly high-octane gasoline.