Conversion of model C6–C9 alkanes and straight-run gasoline over Pt(0.1%)-Fe(5%)/Al2O3 catalysts promoted with various additives

Received: 25.06.22. Revised: 18.07.22. Accepted: 18.07.22. Available online: 26.07.22.High-octane gasoline containing 62.4% isoalkanes and 2.3% aromatic hydrocarbons is obtained on zeolite-containing catalyst at 350 °C with H2:feedstock ratio = 200:1.Decrease in H2:feedstock ratio to 50 leads to increase of hydrocracking direction, formation of aromatic hydrocarbons and olefins as well as C10–C13 isoalkanes obtained as a result of a disproportionation reaction.Decrease in H2:feedstock ratio leads to essential change in the composition of straight-run gasoline. The presence of aromatic hydrocarbons and olefins, which are octane-forming components, increases the motor properties of gasoline. C10–C13 isoalkanes are the components of diesel fuel.Growing demand for hydrogen promotes the research devoted to the development of new catalysts for hydrocarbons processing in absence of H2 or at its low concentration. In the present work, it was shown that during the conversion of straight-run gasoline on a zeolite-containing polyfunctional catalyst in a hydrogen-free environment cracking, dehydrogenation, isomerization and alkylation take place due to the redistribution of H2 between initial and formed products directly on the catalyst surface. Fine particles (≤50 Å) localize in zeolite cavities and pores of aluminum oxide, while larger ones are on their outer surface