Researchers at the University of Sydney have made a breakthrough by finding a cleaner and smarter way to produce ammonia. Using electricity and artificial lightning, the team has developed a process that could replace the traditional Haber-Bosch method, which is known for its huge carbon footprint. This innovation could change ammonia production more efficiently, and without relying on fossil fuels.
Ammonia is one of the most important chemicals in the world. It is a main ingredient in fertilizers that help feed nearly half of the global population. But the traditional way of making ammonia, known as the Haber-Bosch process, is energy-intensive and responsible for high greenhouse gas emissions. It requires extreme heat, high pressure, and large amounts of natural gas. Manufacturers currently use this process for 90 percent of global ammonia production.
The Sydney researchers believe their discovery could change this completely. “In this research, we’ve successfully developed a method that allows air to be converted to ammonia in its gaseous form using electricity. A huge step towards our goals,” said Professor PJ Cullen, who led the study at the University of Sydney’s School of Chemical and Biomolecular Engineering.
The team’s method uses plasma, often called artificial lightning, to excite nitrogen and oxygen molecules from the air. The system then passes these molecules through a membrane-based electrolyzer. This is a small silver box where the final conversion to ammonia happens. This two-step process combines plasma technology with electrolysis. Engineers designed it to be energy-efficient and scalable.
“Industry’s appetite for ammonia is only growing. For the past decade, the global scientific community, including our lab, has wanted to uncover a more sustainable way to produce ammonia that doesn’t rely on fossil fuels,” Cullen explained.
Currently, manufacturers produce ammonia in large centralized plants. They must also transport the product over long distances. The Sydney breakthrough opens the possibility of small, decentralized production units that can operate even in rural or remote areas. This could reduce transportation needs and lower costs, making ammonia more accessible worldwide.
Ammonia contains three hydrogen atoms, making it an excellent carrier for hydrogen fuel. As a result, ammonia could become a vital part of hydrogen storage and transportation. In fact, industries are already testing methods to “crack” ammonia molecules to extract hydrogen for energy applications.
Industries are also considering ammonia as a carbon-free fuel, especially for ships. The shipping industry is responsible for about 3 percent of global greenhouse gas emissions and is searching for cleaner alternatives to traditional fuels. This new green ammonia could help reduce those emissions.
“This new approach is a two-step process, namely combining plasma and electrolysis. We have already made the plasma component viable in terms of energy efficiency and scalability,” said Cullen. “To create a more complete solution to sustainable ammonia production, we need to push the energy efficiency of the electrolyzer component.”
The research has been published in the journal Angewandte Chemie International Edition. The University of Sydney team has been working on green ammonia technology for over six years. As a result, they believe their method could help meet the growing global demand for ammonia in a sustainable way.
The Haber-Bosch process has been around since the 1900s and revolutionized farming by allowing mass production of fertilizers. But it also comes with a massive climate cost, contributing to greenhouse gas emissions and climate change. As ammonia demand increases, the need for a cleaner alternative has never been greater.
“Currently, generating ammonia requires centralized production and long-distance transportation of the product. We need a low-cost, decentralized, and scalable green ammonia,” Cullen emphasized.
