Researchers at the University of New South Wales (UNSW) have unveiled a pioneering process that could transform how urea, one of the world’s most widely used fertilizers, is produced, significantly reducing greenhouse gas emissions from the global agricultural sector.
The new technology uses renewable electricity to electrochemically convert carbon dioxide (CO₂) emissions and nitrogen-rich waste into urea, bypassing traditional fossil fuel-intensive production methods. Currently, urea is mainly manufactured via the Haber-Bosch process, which relies on natural gas or coal and contributes substantial CO₂ emissions.
From Waste to Fertilizer: How It Works
Scientists at UNSW developed an electrochemical system that couples CO₂, often released by heavy-industry outputs such as cement plants, with common nitrogen pollutants like nitrate and nitrite, which frequently contaminate waterways from agriculture and industrial runoff.
Instead of first converting nitrogen to ammonia and then synthesizing urea at high temperature and pressure, this new approach directly forms urea through carbon-nitrogen coupling powered by renewable electricity.
“To make zero-carbon urea, we directly use waste carbon dioxide and nitrogen pollutants with renewable energy, rather than relying on ammonia,” explained Associate Professor Rahman Daiyan, lead researcher on the project. The team published their findings in Nature Communications, emphasizing the potential to decarbonize one of agriculture’s most emissions-intensive supply chains.
Catalyst Innovation and Production Efficiency
At the heart of the technology is a copper-cobalt catalyst engineered at the atomic scale, which enables strong and selective carbon-nitrogen bonding — a critical step in producing urea more efficiently than existing electrochemical methods. This catalyst design enhances production rates and could make the new process more competitive with traditional industrial approaches.
The researchers demonstrated that their system achieved promising results compared with other carbon-nitrogen coupling techniques, showing strong potential for scalability and integration into future clean fertilizer manufacturing.
Environmental and Industry Implications
Urea is essential for feeding more than half of the world’s population, underscoring the importance of cleaner production pathways. However, conventional urea manufacturing contributes significantly to the chemical industry’s carbon footprint due to its dependence on fossil fuels.
By redirecting CO₂ emissions and nitrogen waste into fertilizer production, the new electrochemical process offers dual environmental benefits:
- Carbon footprint reduction by minimizing reliance on fossil fuels.
- Pollution mitigation by using nitrogen pollutants that otherwise contaminate water sources.
The technology also aligns with global sustainability objectives, including efforts to decarbonize agriculture and achieve net-zero emissions in industrial processes.
Australia, a major agricultural exporter, imported about 3.8 million metric tons of urea in 2024 due to limited domestic production capacity. Innovating cleaner, local fertilizer production could enhance both supply security and environmental outcomes.
Looking ahead, researchers aim to refine the technology, scale production systems, and explore industrial partnerships to transition the process from laboratory to commercial use. If successful, the development could mark a significant step toward zero-carbon fertilizer manufacturing and sustainable agriculture worldwide.
