Solar reforming route to hydrogen and chemical feedstocks from PU and plastic waste

The research demonstrates how mixed and difficult-to-recycle polymers can be broken down and upgraded under relatively mild conditions, potentially opening new pathways for chemical recycling of polyurethane-based materials widely used in foams, coatings and elastomers.

The team combined an acid-catalysed depolymerisation step with photocatalytic reforming driven by visible light. This integrated approach enables the conversion of polymer chains into smaller oxygenated molecules, alongside hydrogen generation. According to the paper, the system achieved conversion of plastic-derived intermediates with high selectivity toward products such as acetic acid, while simultaneously producing hydrogen gas.

The authors state that integrating these two steps into a single process “offers an effective platform” for turning plastic waste into both fuels and chemical feedstocks.

Polyurethane relevance
While the study addresses plastics more broadly, the implications for polyurethane are significant. Polyurethane materials—particularly thermoset foams used in insulation, automotive interiors and footwear—remain challenging to recycle mechanically due to crosslinked structures. Chemical routes such as glycolysis have been explored, but often require high temperatures and generate variable-quality outputs.

The approach described in the Joule paper suggests a lower-temperature alternative that could complement existing polyurethane recycling technologies. By breaking down urethane linkages into smaller oxygenated compounds and reforming them into higher-value chemicals, the process aligns with industry efforts to move toward circular feedstocks for polyols and other intermediates.

In addition, the co-production of hydrogen introduces a potential energy vector, which could improve process economics if integrated into industrial polyurethane waste streams.

Process performance and scalability
The study reports that the catalyst system maintained activity over extended operation, with measurable conversion efficiencies and high selectivity toward targeted products.

However, the work remains at laboratory scale. Challenges for scale-up include catalyst stability under real-world waste conditions, separation of mixed polymer streams, and integration into existing polyurethane recycling infrastructure.
Industry context.

For polyurethane producers and recyclers, the findings reflect a broader shift toward hybrid chemical recycling technologies that combine depolymerisation with catalytic upgrading. Interest in such approaches is growing as regulators and brand owners push for higher recycling rates and reduced reliance on virgin fossil-based feedstocks.

If developed further, solar-driven reforming processes could provide a route to recover value from polyurethane waste streams that are currently landfilled or incinerated, particularly flexible foams and composite materials.

Joule