Paving the Way for Greener Ammonia Production

As essential as it is in food production, ammonia is making waves for the wrong reasons. This crucial chemical, the second most produced globally behind sulfuric acid, is critical for making fertilizers that feed the world’s population. However, the process used to manufacture it consumes up to 2% of the world’s energy and contributes to about 1.5% of greenhouse gas emissions. Consequently, the quest for sustainable ammonia production methods is on.

The Haber-Bosch process, which has been in use for over a century, is largely responsible for ammonia production. This method has a heavy reliance on fossil fuels, both for the heat it requires and the hydrogen in the process. However, while electrochemistry provides an alternative path by utilizing electricity instead of heat and pressure, implementing it on a larger, economically viable scale is yet to be realized. But this could soon change due to some promising research at the Massachusetts Institute of Technology (MIT).

A team of researchers at MIT is seeking to change the ammonia production landscape. They have developed a predictive approach that can potentially identify promising catalyst materials for electrochemical ammonia production. Catalysts play an important role in driving chemical reactions, with their properties determining the efficiency of these reactions.

The study, spearheaded by Bilge Yildiz, the Breen M. Kerr Professor at MIT, offers valuable insights. According to Yildiz, their approach isolates the physical properties that propel catalytic activity in ammonia production. Published in the EES Catalysis journal by the Royal Society of Chemistry, these findings could significantly speed up the search for materials to make the low-emission electrochemical method as competitive as the Haber-Bosch process.

As the global population continues to expand, the demand for food and consequently, fertilizer, also increases. However, the Haber-Bosch process, which accounts for over 90% of the world’s ammonia, is at odds with sustainability objectives and climate change targets due to its high energy consumption and carbon footprint. Enter electrochemical ammonia production – while it exists, it needs to be more efficient for industrial-scale utilization. This improvement hinges on finding a metallic catalyst that reduces energy needs and augments ammonia selectivity.

In the hunt for better catalysts, researchers have identified transition metal nitride compounds as promising candidates. These compounds, combined with tools such as density functional theory and machine learning, could potentially improve various reaction aspects. These tools aid in modeling material properties and predicting outcomes, thereby fast-tracking the search for effective catalyst alloys.

While there are hurdles to clear—including nitrogen dissociation and hydrogen transfer—such theoretical findings hold promise. They now need practical testing in the lab, which involves building a working reaction cell to gauge the catalyst’s real-time performance. This won’t happen overnight, as Dane Morgan, a professor at the University of Wisconsin, points out. Transforming these theoretical insights into practice will take time, but it’s an exciting leap towards greener ammonia production.

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