Producing ammonia through electrochemical processes could reduce carbon dioxide emissions

Producing ammonia through electrochemical processes could reduce carbon dioxide emissions
(a) Schematic illustration of the synthesis of Ti2NTx MXene via oxygen-assisted molten salt fluoride treatment of the parent MAX phase Ti2AlN at 550 °C for 5 h under flowing argon, then exposure to air, followed by fluoride salt removal in 4 M H2SO4, finally delamination is accomplished via sonication in water for 4 h. Models are not based on gathered data, only as a general guideline. In lab photographs of (b) MAX phase, (c) Multilayer Ti2N MXene after acid washing, and (d) Single layer MXene acquired after delamination in water. (e) SEM imaging of Ti2AlN MAX phase (black outline), molten salt treated MAX phase (blue outline), multilayer Ti2N MXene (purple outline), and few layer Ti2N MXene (red outline). The lateral size of the individual MXene flakes is roughly 5 μm. (f) XRD, (g) Raman, and (h) UV–Vis spectra of Ti2AlN MAX phase (black) and single layer Ti2N MXene (red). XRD was gathered using a zero-diffraction silicon plate with a well. Raman spectroscopy was gathered using 532 nm laser at 5% power at a 1 s exposure time. UV–Vis spectroscopy was collected using water as the matrix. Credit: Scientific Reports (2022). DOI: 10.1038/s41598-021-04640-7

Ammonia is commonly used in fertilizer because it has the highest nitrogen content of commercial fertilizers, making it essential for crop production. However, two carbon dioxide molecules are made for every molecule of ammonia produced, contributing to excess carbon dioxide in the atmosphere. 

A team from the Artie McFerrin Department of Chemical Engineering at Texas A&M University consisting of Dr. Abdoulaye Djire, assistant professor, and graduate student Denis Johnson, has furthered a method to produce through electrochemical processes, helping to reduce carbon emissions. This research aims to replace the Haber-Bosch thermochemical process with an electrochemical process that is more sustainable and safer for the environment.

The researchers recently published their findings in Scientific Reports.  

Since the early 1900s, the Haber-Bosch process has been used to produce ammonia. This process works by reacting atmospheric nitrogen with hydrogen gas. A downside of the Haber-Bosch process is that it requires high pressure and high temperature, leaving a large energy footprint. The method also requires hydrogen feedstock, which is derived from nonrenewable resources. It is not sustainable and has negative implications on the environment, expediting the need for new and environmentally friendly processes.

The researchers have proposed using the electrochemical nitrogen reduction reaction (NRR) to produce ammonia from atmospheric nitrogen and water. The benefits of using an electrochemical method include using water to provide protons and the ability to produce ammonia at ambient temperature and pressure. This process would potentially require lower amounts of energy and would be less costly and more environmentally friendly than the Haber-Bosch process.

The NRR works by using an electrocatalyst. For this process to succeed, nitrogen must bond to the surface and break apart to produce ammonia. In this study, the researchers used MXene, a titanium nitride, as the electrocatalyst. What differentiates this catalyst from others is that nitrogen is already in its structure, allowing for more efficient ammonia formulation.

"It's easier for ammonia to form because the protons can attach to the nitrogen in the structure, form the ammonia and then the ammonia will leave out of the structure," said Johnson. "A hole is made in the structure that can pull the nitrogen gas in and separate the triple bond."

The researchers found that using titanium nitride induces a Mars-van Krevelen mechanism, a popular mechanism for hydrocarbon oxidation. This mechanism follows a lower energy pathway that would allow for higher ammonia production rates and selectivity because of the from the catalyst.

Without modifications to the materials, the researchers reached a selectivity of 20%, which is the ratio of the desired product formed compared to the undesired product formed. Their method could potentially reach a higher selectivity percentage with modifications, forging a new pathway to ammonia production through .

"The Department of Energy has set a goal of a selectivity of 60%, which is a challenging number to reach," said Johnson. "We were able to reach 20% using our material, showcasing a method that we might be able to take advantage of moving forward. If we upgrade our material, can we reach 60% soon? That is the question we will continue to work to answer."

This research could potentially reduce the carbon footprint and global energy usage on a larger scale. 

"In the future, this could be a major scientific reform," said Djire. "About 2% of the world's total energy is used for ammonia production. Reducing that huge number would drastically reduce our carbon footprint and energy consumption."  

Other contributors to the publication are Eric Kelley from the chemical engineering department at Texas A&M, Brock Hunter from Auburn University, and Jevaun Christie and Cullan King from Prairie View A&M University.


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More information: Denis Johnson et al, Ti2N nitride MXene evokes the Mars-van Krevelen mechanism to achieve high selectivity for nitrogen reduction reaction, Scientific Reports (2022). DOI: 10.1038/s41598-021-04640-7
Journal information: Scientific Reports

Citation: Producing ammonia through electrochemical processes could reduce carbon dioxide emissions (2022, April 8) retrieved 25 June 2022 from https://phys.org/news/2022-04-ammonia-electrochemical-carbon-dioxide-emissions.html
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