Turning Plastic Waste Into Clean Hydrogen With a Low-Temp Alkaline Process

A study published in PNAS describes an alkaline thermal treatment (ATT) that converts mixed plastic waste into high-purity hydrogen at lower temperatures with negligible direct CO2 emissions, potentially tackling both plastic pollution and clean-energy needs. Lab tests on PET, PE, and PP show hydrogen yields comparable to pyrolysis/gasification, with a need for pre-treatment of some plastics. While promising, researchers caution that scalability, economic viability, and full life-cycle environmental impact still require further research, along with handling contaminated plastics and recycling the sodium hydroxide.