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Photothermal recycling of waste polyolefin plastics into liquid fuels with high selectivity under solvent-free conditions
Summary
Researchers developed a sunlight-powered system using a ruthenium-titanium dioxide catalyst that converts waste polyolefin plastics — including common bags and containers — into liquid fuels like gasoline and diesel with 86% efficiency in just three hours. The method requires no solvents and runs on concentrated sunlight, offering a low-cost strategy to recycle otherwise hard-to-process plastic waste.
The widespread use of polyolefin plastics in modern societies generates huge amounts of plastic waste. With a view toward sustainability, researchers are now seeking novel and low-cost strategies for recycling and valorizing polyolefin plastics. Herein, we report the successful development of a photothermal catalytic recycling system for transforming polyolefin plastics into liquid/waxy fuels under concentrated sunlight or xenon lamp irradiation. Photothermal heating of a Ru/TiO2 catalyst to 200-300 °C in the presence of polyolefin plastics results in intimate catalyst-plastic contact and controllable hydrogenolysis of C-C and C-H bonds in the polymer chains (mediated by Ru sites). By optimizing the reaction temperature and pressure, the complete conversion of waste polyolefins into valuable liquid fuels (86% gasoline- and diesel-range hydrocarbons, C5-C21) is possible in short periods (3 h). This work demonstrates a simple and efficient strategy for recycling waste polyolefin plastics using abundant solar energy.