Methods and systems for upgrading mixed pyrolysis oil to light aromatics over mixed metal oxide catalysts

A system for upgrading mixed pyrolysis oil, the system comprising:

• a mixed pyrolysis oil stream;
• a pyrolysis oil upgrading unit in fluid communication with the mixed pyrolysis oil stream, where the pyrolysis oil upgrading unit comprises a mixed metal oxide catalyst, where:
• the mixed pyrolysis oil stream is formed from light pyrolysis oil and heavy pyrolysis oil at a weight ratio of 10:90 to 40:60 with light pyrolysis oil representing a bottom stream of a gas steam cracker and heavy pyrolysis oil representing a bottom stream of a naphtha steam cracker;
• the mixed metal oxide catalyst comprises:
• from 60 wt. % to 95 wt. % iron oxide;
• from 1 wt. % to 20 wt. % zirconium oxide;
• from 0.1 wt. % to 10 wt. % cerium oxide;
• and
• from 1 wt. % to 20 wt. % aluminum oxide, where the weight percentages are based on the total weight of the mixed metal oxide catalyst;
• and
• the pyrolysis oil upgrading unit is operable to contact the mixed pyrolysis oil stream with hydrogen in the presence of the mixed metal oxide catalyst to produce a reaction effluent;
• and
• a separation unit disposed downstream of the pyrolysis oil upgrading unit and operable to separate a used mixed metal oxide catalyst from the reaction effluent to produce a reaction product comprising light aromatic compounds.