KIER's New Patent Cracks Ammonia into 99.999%-Pure Hydrogen

💡 TL;DR: Korea's national energy lab just received US patent 12,697,581 for a two-stage Vacuum Pressure Swing Adsorption (VPSA) system that converts ammonia-derived gas into 99.999%-pure hydrogen at an 86.7% recovery rate. This solves a critical bottleneck in using ammonia as a global hydrogen carrier - and it lands exactly as governments and corporations are committing hundreds of billions of dollars to build the hydrogen economy.

What the patent actually claims

Patent US 12,697,581 B2, granted by the USPTO on August 4, 2026, covers a Vacuum Pressure Swing Adsorption (VPSA) apparatus designed for one precise job: taking the mixed gas produced when ammonia (NH₃) is thermally decomposed and turning it into ultra-pure hydrogen fit for fuel cells and industrial use. When ammonia cracks, it yields roughly 75% hydrogen and 25% nitrogen, with residual traces of ammonia and moisture. Each contaminant requires different chemistry to remove, and each one - if left in the stream - degrades downstream equipment.

The assignee, the Korea Institute of Energy Research (KIER), solved this with a two-stage architecture. The first stage is a guard bed: two layers of adsorbents - silica gel or activated alumina for moisture, then magnesium-impregnated activated carbon for ammonia traces - scrub the gas before it can reach the main purification unit. The second stage uses zeolite CaX to strip the remaining nitrogen to below 10 parts per million. Demonstrated in 5-bed and 6-bed configurations, the system achieves hydrogen at 99.999% purity with a recovery rate of 86.7-87.4% from a feed containing 3,000 ppm NH₃ and 25% N₂. That is the fuel-cell standard.

The structural insight - separating the guard bed physically from the purification stage - is the heart of the patent claim. In a conventional single-stage PSA system, ammonia that bleeds past the moisture-removal layer eventually poisons the nitrogen-removal adsorbent and cuts its working life. The KIER design makes the guard bed independently serviceable: engineers can replace it without disturbing the zeolite purification unit behind it. That operational advantage compounds over a plant's multi-year lifetime. The key-facts table below captures the core numbers at a glance.

The problem it solves: why ammonia is the hydrogen economy's missing link

Hydrogen is the ideal clean fuel on paper: it burns to water, stores remarkable energy per kilogram, and powers fuel cells at near-zero emissions. In practice, it is one of the hardest substances to ship in bulk. Pure hydrogen requires either cryogenic cooling to -253°C as a liquid or pressurization to 700 bar for vehicle tanks. It seeps through almost every metal container material over time. These physics make transcontinental hydrogen trade extraordinarily expensive with today's infrastructure.

Ammonia changes that equation. Already produced at more than 180 million tonnes per year for fertilizers, ammonia has a global shipping and storage infrastructure built over decades. It liquefies at just -33°C - easily achievable with standard industrial refrigeration - and carries far higher hydrogen density than compressed gas. This makes ammonia the leading candidate for long-distance clean hydrogen delivery: green hydrogen produced from wind or solar in Chile, Australia, or the Middle East can be converted to ammonia at the source, shipped as liquid, and cracked back into hydrogen at the destination port.

The global ammonia fuel market reached approximately $650.91 million in 2025 and is projected to reach $4.11 billion by 2034 at a CAGR of 22.28% (Fortune Business Insights, 2025). IRENA's July 2025 report projected 110-130 million tonnes of renewable ammonia exported per year globally by 2050. The IEA estimates ammonia could cover 44-45% of global shipping fuel demand by 2050. The supply chain is being built around one critical final step: converting incoming ammonia back into clean, certifiable hydrogen. Without a reliable purification stage at that juncture, the entire chain breaks. That is exactly the gap US 12,697,581 fills.

What this patent depends on - and what it could unlock

This VPSA system sits at one specific node in a much larger chain, and its full value depends on progress at every adjacent node. Upstream, it requires functioning green ammonia production: electrolysers converting renewable electricity to hydrogen, then Haber-Bosch plants combining that hydrogen with nitrogen. It requires an efficient ammonia cracker at the destination - the thermal decomposition step that is itself an active area of R&D, where lower-temperature catalytic cracking is a separate patent race. And it requires port infrastructure designed to receive and store liquid ammonia safely.

Downstream, the 99.999%-purity output of this system unlocks applications that cannot run on lower grades. Fuel cell electric vehicles and stationary fuel cells require hydrogen meeting SAE J2719 quality standards, which impose nitrogen below 100 ppm and ammonia below 0.1 ppm - exactly the thresholds this patent claims to hit. Clean hydrogen pipelines require predictable, consistent gas composition to avoid combustion variability. Industries producing semiconductors, pharmaceuticals, and specialty metals use ultra-pure hydrogen as a reducing gas: all become viable end-users for ammonia-import terminal output.

The materials inside the patent also trace wider system connections. Zeolite CaX is a refined adsorbent belonging to a specialized manufacturing chain. Magnesium-impregnated activated carbon is a precision material. The compressors and vacuum pumps needed for VPSA operation are advanced industrial hardware. Successful commercialization of this system would pull demand into each of those adjacent industries. That is how a single patent becomes a node in the innovation graph rather than an isolated invention.

Who is behind this - and why Korea leads the ammonia-hydrogen race

The Korea Institute of Energy Research (KIER) is South Korea's central government energy technology body, headquartered in Daejeon's Daedeok Science Town. It operates under the Ministry of Science and ICT with a mandate spanning the full energy technology stack. This patent is one output of Korea's concentrated bet on hydrogen as a national energy security strategy, not merely a climate ambition.

South Korea imports more than 90% of its energy today. The government views the hydrogen economy as an energy independence strategy as much as a climate one. Its national roadmap targets 3.9 million tonnes of hydrogen demand by 2030 and 27.9 million tonnes by 2050, with roughly 82% of the 2050 total sourced overseas - meaning ammonia imports are a central pillar of the plan, not a peripheral option. To back this, South Korea's 17 largest private companies collectively pledged 43.4 trillion KRW (approximately $38 billion) in hydrogen investments by 2030, led by SK Group (18.5 trillion KRW), Hyundai Motor (11.1 trillion KRW), and POSCO (10 trillion KRW) (InvestKOREA, 2022). That capital needs a supply chain, and this patent is one piece of it.

The PCT filing (PCT/KR2023/006696, May 2023) signals that KIER sought international protection from the outset. The ten inventors - Sang-sup Han, Hyung-chul Yoon, Hee-tae Beum, and seven colleagues, all based in Daejeon - were building something intended to work beyond Korea's borders. Infrastructure R&D at this level is designed to be commercialized into domestic port projects, licensed to private companies, or used as the technical backbone for national standards. A prior publication (US 2025/0001352 A1) and a WO publication (WO2024/143722) both preceded the grant, giving the world nearly two years to study the design before the monopoly took full effect.

Who it threatens, and who it helps

For industrial gas companies providing PSA and VPSA equipment - Air Products, Linde, Air Liquide, and their regional peers - this patent marks KIER as a serious competitor in the ammonia-cracking niche. If the two-stage guard-bed architecture proves to be the preferred standard for this application, existing single-stage PSA suppliers will need to adapt designs or seek a license. That said, the majors have deep patent portfolios and active R&D pipelines in hydrogen purification, so this is more a competitive signal than an immediate market threat.

For hydrogen import terminal developers - projects currently under development in Osaka, Rotterdam, Hamburg, and Incheon - this patent is potentially enabling technology. Each project needs a proven, scalable purification step at the end of the ammonia import process. A KIER-commercialized system, or a licensed equivalent, would be a candidate for each of those installations. Fuel cell operators, hydrogen refueling network builders, and semiconductor fabs requiring ultra-pure hydrogen all benefit from any technology that makes high-purity hydrogen more accessible and economically viable. The technology is additive to the ecosystem, not zero-sum.

So what does it mean for us?

One patent does not build a supply chain. But this one fills a specific, technically verified gap in a supply chain that major economies are already funding at scale. If KIER's VPSA system scales and commercializes as intended, it could become a standard module in ammonia import terminals the way pressure swing adsorption systems are now standard in industrial gas plants worldwide - invisible infrastructure that the whole system depends on.

For patent translation and IP professionals, this case illustrates something structural: the most consequential clean energy inventions are increasingly coming from Asian research institutions and being filed simultaneously under multiple jurisdictions - PCT, USPTO, EPO, and national filings in Korea, Japan, China, and beyond. Each of those filings needs to be translated and adapted for the local legal context to be enforceable. Patent translation and IP translation are not bureaucratic formalities in this space: they are how a Korean government lab's invention becomes enforceable in Germany, licensable in the United States, and adopted in Vietnam. The hydrogen economy is being built patent by patent. Understanding what each one actually claims, in every market where it applies, is the essential work.

FAQ

Sources:

• US Patent 12,697,581 B2, USPTO, 2026
• IEA Global Hydrogen Review 2024
• Fortune Business Insights, Ammonia Fuel Market 2025-2034
• Ammonia Energy Association / IRENA, July 2025
• InvestKOREA, South Korea Hydrogen Economy

About the author

Dao Huy (Lucas) is a professional translator with 7+ years of specialised experience in patent translation, technical translation, and IP translation from English, Chinese, and French into Vietnamese. His day-to-day work includes translating technical documents, patent specifications, and IP dossiers for clients in clean energy, semiconductors, and technology - fields where terminological precision and legal-context awareness are non-negotiable. Patents like US 12,697,581 do not enforce themselves across borders: each jurisdiction requires accurate, legally defensible engineering document translation before a claim can be filed, licensed, or litigated.

If you need patent translation, technical documentation, or IP filings translated from English, Chinese, or French into Vietnamese - or require software and technology localization for the Vietnamese market - get in touch for a quote at daohuy.com.