Researchers at UCLA and Ewha Womans University tested Alkaline Thermal Treatment that converts unsorted PET, PE and PP plastic waste into hydrogen gas with purity above 90% in a single reactor.
A mild thermal oxidation pretreatment solved the toughest chemistry problem by weakening PE and PP polymer chains, allowing sodium hydroxide and heat to break down all three common plastics together.
At about 400C, the process runs cooler than gasification and captures the plastic's carbon as solid sodium carbonate instead of releasing CO2; that byproduct could also be converted into calcium carbonate for construction use.
The team says the method could bypass the sorting step that helps leave 79% of plastic waste in landfills and only 9% recycled, though the work remains at lab scale and still needs optimization and economic testing.
With solar-powered reactors now converting plastic to fuel, is this new chemical-intensive process already yesterday's news?
Is hydrogen from plastic truly 'clean' if the process itself relies on massive amounts of industrial chemicals?
By making plastic waste valuable, does this breakthrough accidentally sabotage the global fight to reduce plastic production?
Turning Unsorted Plastic Waste into Clean Hydrogen: The Promise and Challenges of the UCLA-Ewha ATT Process
Overview
The Alkaline Thermal Treatment (ATT) process, pioneered by researchers at UCLA and Ewha Womans University, is a major breakthrough in waste-to-hydrogen technology. This innovative method converts unsorted mixed plastic waste—like PET, PE, and PP—directly into high-purity hydrogen fuel within a single reactor. By eliminating the need for sorting and operating at lower temperatures, ATT offers a streamlined and energy-efficient solution. Its core innovation addresses both the global plastic waste problem and the rising demand for clean hydrogen, holding immediate significance and the potential to revolutionize waste management and sustainable energy production.