Chinese researchers have created a catalyst that turns wastewater into urea, the key building block of fertiliser, while tripling the production rate compared to existing methods. The breakthrough, reported by a team from the Dalian Institute of Chemical Physics, could reshape how one of the world's most widely used chemicals is made.
A catalyst that works with polluted water
The new catalyst is made from nickel and molybdenum, two relatively common metals. It works by driving a chemical reaction that combines nitrogen from wastewater with carbon dioxide to form urea. Unlike conventional processes that require highly purified water and extreme heat and pressure, this catalyst operates under milder conditions and tolerates the impurities found in industrial wastewater. The team reported that the catalyst achieved a urea production rate three times higher than previous best attempts.
Why local communities and farmers should pay attention
Urea is a nitrogen-rich compound used in about half of the world's fertiliser. Current production methods rely on the Haber-Bosch process, which consumes large amounts of energy and releases significant greenhouse gases. The new approach, tested in laboratories in Dalian, China, offers a way to produce urea from waste streams instead of from natural gas. For local communities near industrial plants, this could mean less pollution and a cheaper source of fertiliser. Farmers, who face rising costs for agricultural inputs, could benefit from a more sustainable supply chain.
What the research actually showed
The scientists built a reactor that fed wastewater containing nitrate and nitrite compounds, common pollutants from factories and farms, over the nickel-molybdenum catalyst. They then introduced carbon dioxide and applied an electric current. The catalyst selectively converted the nitrogen compounds into urea with high efficiency. The process ran continuously for over 100 hours without losing performance, suggesting it could be scaled up for industrial use. The findings were published in a peer-reviewed journal.
This work is still at the laboratory stage. Scaling it to commercial levels will require further engineering and testing. But the core discovery, a catalyst that triples urea output while using dirty water as feedstock, points toward a future where waste becomes a resource rather than a problem.
