FIELD: hydrocarbon isomerization catalysts. SUBSTANCE: catalyst is zeolite with proton concentration 0.02 mmol/g at silica-to-alumina ratio from 20 to 500 and with pore diameter 5-6.5 
. Catalyst is stable at 550-750 C that favors production of olefins containing ethylene as major component and good amounts of monocyclic aromatic hydrocarbons. EFFECT: increased catalyst stability. 7 cl, 10 tbl, 16 ex
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