Researchers Convert Mixed Plastic Waste Into 90% Pure Hydrogen at 400°C With Near-Zero Direct CO2
Updated
Updated · Gizmodo · Jul 18
Researchers Convert Mixed Plastic Waste Into 90% Pure Hydrogen at 400°C With Near-Zero Direct CO2
3 articles · Updated · Gizmodo · Jul 18
Summary
A PNAS study detailed alkaline thermal treatment, or ATT, as a way to turn mixed plastic waste into high-purity hydrogen at lower temperatures than gasification and without extensive sorting.
The process mixes plastics with sodium hydroxide and heat; after a mild oxygen-and-heat pre-treatment for PE and PP, it efficiently decomposed PET, PE and PP in lab tests.
Hydrogen yields reached 43.7, 51.9 and 30.2 millimoles per gram for PET, PE and PP, respectively—levels the researchers said are comparable to pyrolysis and gasification, while direct carbon emissions were negligible.
The advance targets a recycling system where only 9% of plastic was recycled in 2022, even as use is projected to rise from 464 megatons in 2020 to 884 megatons by 2050.
Researchers and outside experts said scale-up questions remain, including full life-cycle emissions, sodium hydroxide recycling, economics and performance on dirtier real-world waste streams.
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.