Depolymerization catalyst system and process

A process for depolymerizing polymers, the process comprising:

• a) adding a polyolefin-based feed stream and a first co-catalyst to a first pyrolysis reaction zone to form a first reaction mixture, wherein the first co-catalyst comprises an activated clay component, a solid base component, or a combination thereof;
• b) reacting the first reaction mixture under first depolymerization conditions in the absence of oxygen to form a first vapor stream and first liquid stream comprising char;
• c) adding the first vapor stream to a first condensation zone, wherein the first vapor stream is subjected to condensing conditions to form a second vapor stream and a second liquid stream;
• d) adding the second liquid stream and a zeolite catalyst component to a second pyrolysis reaction zone to form a second reaction mixture;
• e) reacting the second reaction mixture under second depolymerization conditions in the absence of oxygen to form a third vapor stream and a third liquid stream comprising char;
• and
• f) adding the third vapor stream to a second condensation zone, wherein the third vapor stream is subjected to condensing conditions to form a fourth vapor stream and a fourth liquid stream, wherein the second liquid product comprises one or more olefin monomers.