Agriculture relies on synthetic nitrogen fertilizer, which is made using energy- and carbon-intensive processes and creates nitrate-containing runoff. Researchers have long sought solutions to reduce emissions from the industry that accounts for 3% of energy consumption each year.
Agriculture relies on synthetic nitrogen fertilizer, which is made using energy- and carbon-intensive processes and creates nitrate-containing runoff. Researchers have long sought solutions to reduce emissions from the industry that accounts for 3% of energy consumption each year.
A collaboration between two labs at Northwestern University, partnering with the University of Toronto, has found that producing the fertilizer urea using electrified synthesis could both denitrify wastewater while enabling low-carbon-intensity urea production. The process, which includes converting carbon dioxide and waste nitrogen by using a hybrid catalyst made of zinc and copper, could benefit water treatment facilities by reducing their carbon footprint and supplying a potential revenue stream.
The findings are published today in the journal Nature Catalysis.
« It’s estimated that synthetic nitrogen fertilizer supports half of the global population, » said Northwestern professor Ted Sargent, a corresponding author on the paper. « A chief priority of decarbonization efforts is to increase quality of life on Earth, while simultaneously decreasing society’s net CO2 intensity. Figuring out how to use renewable electricity to power chemical processes is a big opportunity on this score. »
Sargent is the co-executive director of the Paula M. Trienens Institute for Sustainability and Energy (formerly ISEN) and a multidisciplinary researcher in materials chemistry and energy systems, with appointments in the department of chemistry in the Weinberg College of Arts and Sciences and the department of electrical and computer engineering in the McCormick School of Engineering.
