Plastics made life easier, but their durability created a global problem. Bags, bottles, and films last for centuries, breaking into microplastics that infiltrate soil, water, and even the air. These particles enter food chains and pose health risks.

At the University of Delaware, researchers tried a new angle. Instead of simply recycling, they looked at plastics as potential fuel. Their work demonstrates a catalyst that speeds up the conversion of plastics into liquid fuels. The process also produces fewer unwanted byproducts.

One approach stands out: hydrogenolysis. It uses hydrogen gas and a catalyst to chop up polymers. The result can be fuels for transport or industry, offering a way to turn stubborn waste into something useful. Conventional catalysts, though, struggle with this process.

Plastic molecules are large and tangled, making it difficult for them to fit into the tiny spaces where reactions occur. That limited contact slows the reaction and often leads to the incomplete breakdown of plastic.

It also reduces efficiency and produces unwanted byproducts, such as gases that add to environmental concerns. For scientists, the challenge was to design a system that could let polymers interact more freely with catalysts.

The Delaware group turned to MXenes – nanomaterials with a layered structure. MXenes are thin, sheet-like materials that normally stack tightly together, restricting flow. By rethinking this structure, the team gave MXenes a twist that opened the way for faster and cleaner plastic conversion.

The team inserted silica pillars to hold the layers apart, creating mesoporous MXenes. Now polymers and intermediate compounds could slip through the spaces and interact with the catalyst more effectively.

To prove the idea, the group worked with low-density polyethylene (LDPE), the plastic used in bags and wraps. Inside a pressurized reactor, LDPE was mixed with hydrogen gas and the mesoporous MXene-supported ruthenium catalyst.

Heat turned the plastic into a syrup-like liquid, which then reacted. Results showed conversion rates nearly twice as fast as earlier LDPE hydrogenolysis studies. The catalyst also guided the reaction toward liquid fuels instead of waste gases like methane.

The open MXene structure stabilized ruthenium nanoparticles, keeping them active and selective. This stability meant faster conversion and cleaner products.

The outcome shows how careful design at the nanoscale can reshape the performance of everyday processes and open new possibilities for sustainable technologies.

Source: Earth.com

Image: Canva