HYDROGEN-FREE TECHNOLOGY FOR PROCESSING PETROLEUM FRACTIONS ON MULTIFUNCTIONAL ZEOLITE CATALYSTS

The process of hydrogen-free processing of petroleum fractions on zeolite- containing catalysts was implemented at a laboratory catalytic plant under conditions of varying technological parameters. Modification was carried out with metals with variable valence, REM, and phosphorus. It is shown that in the process of refining gas condensates and petroleum fractions (gasoline and diesel) without hydrogen-containing gas, the catalytic properties, activity and selectivity of synthesized catalysts depend on the nature and concentration of the introduced modifiers, the structure and condition of the active centers and the conditions of the process. The directions of hydrocarbon transformations in the process of anhydrous refining on a zeolite catalyst are considered. It has been established that the catalysts have multifunctional properties, and are capable of simultaneously conducting several reactions: cracking, hydrodesulfurization, dehydrogenation, isomerization, dehydrocyclization, alkylation. The physicochemical characteristics of zeolite-containing catalysts have been studied by electron microscopy and thermal desorption of ammonia. It is shown that acidic centers coexist with metallic ones on the surface of the developed catalysts. The composition of acid centers may include metals in various degrees of oxidation, fixed both inside the zeolite cavities and on their outer side.