Abstract: Under the dual goals of "carbon peak and carbon neutrality" and economic growth, the petroleum and chemical industry is facing an increasingly urgent demand for efficient resource utilization and green recycling. As a core unit, the efficient use and cyclic regeneration of catalysts can reduce costs and contribute to carbon emission reduction. However, traditional catalyst regeneration is characterized by high energy consumption and large carbon emissions, making it necessary to explore low-carbon and high-efficiency pathways. In China, plastic waste exceeds 60 Mt/a, with a recycling rate of approximately 30%. Incineration and landfilling of such waste lead to resource waste and pollution. Pyrolysis technology for waste plastics can convert hard-to-recycle plastics into liquid fuels, combustible gases, and carbon, thereby promoting resource reuse. With the optimization of catalyst performance and processes, pyrolysis efficiency has improved, making pyrolysis an important technology for chemical recycling of waste plastics. Nevertheless, its industrialization is restricted by factors such as high energy consumption, the impact of impurities, and the treatment of waste gas and residues. Looking ahead to the coupling of waste plastic pyrolysis products with the cyclic utilization of petrochemical catalysts, this work explores the applications and synergistic mechanisms of pyrolysis gas, char, and oil in catalyst regeneration, preparation, and cracking processes. It proposes an integrated low-carbon scheme, which can provide theoretical and practical support for the green transition of the petrochemical industry.

Key words: waste plastic recycling, pyrolysis, catalyst regeneration, circular utilization