Chemists Turn Plastic Waste Into Hydrogen, Cutting CO2 by Over 98%
Updated
Updated · Chemistry World · Jul 15
Chemists Turn Plastic Waste Into Hydrogen, Cutting CO2 by Over 98%
1 articles · Updated · Chemistry World · Jul 15
Summary
Woo-Jae Kim’s team made hydrogen from plastic waste with emissions cut by more than 98% for polyethylene, bringing output to just above the 4kg CO2-per-kg-hydrogen clean-hydrogen threshold.
A sodium-hydroxide pretreatment lowered reaction temperatures to about 350°C, far below the 700°C-plus used in earlier plastic-to-hydrogen methods, reducing energy use and emissions.
The process worked best on pretreated polyethylene and also handled mixed plastic waste, a key point in South Korea, where only about 27% of waste is recycled versus a 9% global average.
Steam methane reforming typically emits around 10kg of CO2 per kg of hydrogen, while water electrolysis remains limited and costly in Korea, making alternative low-carbon routes attractive for steel, ammonia and chemicals.
The researchers have so far tested less than 1g of plastic and are scaling to 100g, while trying to raise hydrogen yield above half the theoretical maximum and find uses for the sodium carbonate byproduct.
Could turning plastic waste into valuable hydrogen fuel accidentally sabotage efforts to reduce plastic use?
This breakthrough creates a valuable byproduct, but what if its success makes that product worthless?
Plastic-to-Hydrogen Breakthroughs: The Race to a $1.5 Billion Clean Energy Market by 2030
Overview
Escalating plastic waste and the urgent need for clean energy are driving innovative breakthroughs that transform plastic pollution into clean hydrogen. Recent research, such as the Alkaline Thermal Treatment (ATT) process developed by UCLA and Ewha Womans University, shows how new technologies can reduce sorting costs and process complexity, addressing key barriers to commercialization. These advances efficiently repurpose plastic waste, supporting both the hydrogen economy and the circular economy. As pioneering efforts demonstrate the feasibility of this 'trash-to-treasure' approach, they offer promising solutions for a more sustainable future by turning waste into valuable clean energy.