Korean Researchers Develop Novel Ruthenium Catalyst Tripling Ammonia Decomposition Efficiency for Cost-Effective Hydrogen Production
Key Insights
Researchers at the Korea Institute of Energy Research (KIER) developed a novel, cost-effective method for synthesizing ruthenium catalysts to efficiently produce hydrogen from ammonia.
The new polyol-based synthesis method controls nanoparticle aggregation without costly capping agents, leading to a catalyst with over three times higher ammonia decomposition performance.
This breakthrough significantly reduces activation energy by 20% and increases hydrogen formation rates by 1.7 times, addressing key cost and scalability challenges for hydrogen carriers.
The technology promises to accelerate the commercialization and localization of ammonia decomposition, crucial for realizing a global hydrogen economy.
SEOUL – Researchers at the Korea Institute of Energy Research (KIER), led by Dr. Kee Young Koo, have unveiled a groundbreaking, cost-effective method for synthesizing ruthenium (Ru) catalysts, dramatically improving the efficiency of hydrogen production from ammonia. This innovation marks a significant stride towards realizing a global hydrogen economy by addressing critical challenges in hydrogen transport and on-demand generation.
Ammonia, composed of three hydrogen atoms and one nitrogen atom, stands out as a highly promising hydrogen carrier due to its high hydrogen content and the existence of extensive global infrastructure for its storage and transport. This makes ammonia a more economically viable option for long-distance hydrogen delivery compared to other carriers. However, the technology required to efficiently decompose ammonia into hydrogen at the point of demand has remained in nascent stages, primarily due to the limitations of existing catalytic processes.
The core of current ammonia decomposition technology relies on ruthenium catalysts, known for their ability to facilitate rapid ammonia decomposition at relatively lower temperatures, typically between 500°C and 600°C—over 100°C less than other catalyst types. Despite this performance advantage, ruthenium is an exceedingly rare metal, found in only a few countries, leading to procurement difficulties and high costs. Historically, ruthenium has been utilized in nanoscale form to maximize its catalytic performance with minimal quantities. Yet, the large-scale production of these nanocatalysts involves complex manufacturing processes and prohibitive costs, which have significantly impeded the commercialization of ammonia decomposition technologies.
In a pivotal development, the KIER team has engineered a novel ruthenium catalyst synthesis method based on the polyol process, specifically designed to enhance the economic viability and scalability of the catalyst. Their innovative approach yielded a catalyst that demonstrated more than three times higher ammonia decomposition performance compared to conventional catalysts. The polyol process, typically used for synthesizing metal nanoparticles, usually requires capping agents to prevent particle aggregation, adding complexity and cost. The KIER team ingeniously circumvented this by controlling the structure and length of carbon chains within the organic molecules, effectively suppressing nanoparticle aggregation without the need for these expensive additives.
Through rigorous experimentation, the researchers confirmed that employing butylene glycol, characterized by its long carbon chain, enabled the uniform dispersion of 2.5nm sized ruthenium particles. Crucially, this method facilitated the formation of 'B5 sites'—highly reactive structural sites on the catalyst surface essential for enhanced hydrogen production reactions. The resulting catalyst exhibited remarkable improvements: its activation energy was reduced by approximately 20% compared to conventional ruthenium catalysts not using butylene glycol, and the hydrogen formation rate increased by 1.7 times. When evaluated for ammonia decomposition performance per unit volume, the newly developed catalyst showcased over three times higher efficiency than those produced via traditional synthesis methods, underscoring its substantial economic potential.
Dr. Kee Young Koo emphasized the practical implications of this breakthrough, stating, “This ammonia decomposition catalyst synthesis technology offers a practical solution to overcome the limitations and cost issues associated with mass production of conventional nanocatalysts. It is expected to contribute significantly to the localization and commercialization of ammonia decomposition catalyst technology.” She further indicated plans for performance verification through mass production of pellet-type catalysts and their integration into various ammonia cracking systems. This research, supported by the Global Top Strategic Research Program of the National Research Council of Science & Technology, was published as a cover paper in the prestigious journal Small.