COKE FORMATION DURING THE CATALYTIC CRACKING OF RESIDUAL OIL BY OXIDECATALYSTS BASED ON ACTIVATED ALUMINUM-ALLOYS

An investigation has been made of the process of coke formation in rea ctions of residual oil conversion on oxide catalysts based on activate d aluminium alloys containing active components In and Ga in a quantit y of 2-20%. The coke yield is extremal in nature and depends on the co ntent of active components in the catalyst. It was established by ther mogravimetry that the oxidation of coke deposits after the cracking of residual oil proceeds in the same temperature range, whereas, after s team and water treatment of the coked catalyst, oxidation of the coke deposits occurs at higher temperatures with different temperature maxi ma, which indicates the heterogeneity of the coke deposits. It has bee n shown that, during the reaction, the phase composition of the cataly st changes considerably under the action of the reaction mixture.