Polyolefins, including polypropylene (PP) and polyethylene (PE), are the most common types of plastics, making up > 50% of the annual production, and also the most difficult to convert because they are entirely made of inert C-C single bonds. As a result, the upcycling of polyolefins requires either high temperature in pyrolysis, which causes high energy consumption and low selectivity, or effective catalytic processes.