What blue ammonia is and why it matters now

Blue ammonia is ammonia produced from natural gas-derived hydrogen with integrated carbon capture and storage (CCS), yielding substantially lower lifecycle greenhouse gas emissions than conventional gray ammonia. It is the production process — not the chemical molecule — that distinguishes blue from gray: the same Haber-Bosch synthesis loop (N₂ + 3H₂ → 2NH₃, operating at 100–200 bar and 400–500°C) remains the backbone, but the CO₂ generated upstream during hydrogen production is captured rather than released to atmosphere.

The urgency stems from scale. Natural gas currently supplies hydrogen for 183 million tonnes of annual global ammonia production — a volume that represents 4% of total global gas supply, according to a 2023 study on clean hydrogen and natural gas demand implications. Conventional Haber-Bosch production generates approximately 2.16 kg CO₂-equivalent per kg of NH₃, establishing the emissions benchmark that any decarbonisation pathway must beat. With global ammonia demand projected to grow 3–4-fold by 2050, the sector’s carbon footprint will expand significantly without intervention.

Blue ammonia occupies a specific strategic position: it leverages existing natural gas infrastructure and proven Haber-Bosch plant configurations while reducing the sector’s carbon intensity on a timeline faster than green ammonia — which requires substantial new renewable electricity and electrolysis capacity — can realistically achieve at scale. Academic and policy literature published between 2020 and 2025 consistently frames blue ammonia as a bridge technology with a finite but important role before green ammonia cost curves converge.

The four hydrogen production routes for blue ammonia

Blue ammonia production technology is differentiated upstream of the Haber-Bosch loop, at the hydrogen generation and CO₂ capture stages. Four distinct routes are identified in the patent and literature dataset, each with a different maturity level, capture integration architecture, and cost profile.

Steam Methane Reforming (SMR) + CCS

SMR is the dominant commercial route, responsible for approximately 75% of global hydrogen production. In the blue ammonia configuration, post-reforming CCS — typically using amine-based scrubbing or pressure-swing adsorption — is integrated downstream of the reformer and shift reactor. The key technical challenge is that SMR generates two distinct CO₂ streams: a relatively concentrated process stream from the reformer and a more dilute CO₂ stream in the furnace flue gas. Capturing both streams requires different technologies and substantially increases capture cost compared to configurations that generate a single, concentrated CO₂ source.

Autothermal Reforming (ATR) + Integrated CCS

ATR combines partial oxidation of methane with catalytic steam reforming in a single oxygen-blown reactor. The oxygen-blown operation generates a cleaner, more concentrated CO₂ stream than SMR flue gas, making CCS integration more efficient and cost-effective. Topsoe A/S — which commercially pioneered ATR for ammonia production — centres its 2025 patent filings on this route. The most detailed process architecture in the dataset, filed by Topsoe in Argentina in 2025, specifies a multi-step sequence: hydrocarbon feedstock preheating → sulfur removal → reforming to syngas (CO, CO₂, H₂, H₂O, CH₄) → water-gas shift reaction → CO₂ capture producing a CO₂-rich stream and a hydrogen-rich stream → hydrogen purification → ammonia synthesis loop. This process is explicitly designed to maximise the carbon capture percentage in any ammonia plant configuration.

Gas Switching Reforming (GSR) — Inherent CO₂ Capture

GSR is an advanced chemical looping-adjacent concept that achieves inherent CO₂ separation during reforming, eliminating the need for a separate post-reforming capture unit. It enables simultaneous H₂ and N₂ co-production directly suited for the Haber-Bosch synthesis loop. A 2022 techno-economic assessment benchmarked GSR against KBR Purifier and Linde Ammonia Concept (LAC) processes, concluding that GSR achieved an “attractive levelized cost” in cash flow analysis, outperforming conventional CCS-integrated processes in projected economics.

Natural Gas Decomposition (NGD) / Methane Pyrolysis

NGD produces hydrogen by thermally decomposing methane into H₂ and solid carbon, avoiding CO₂ generation entirely if the solid carbon byproduct is permanently stored. This pathway carries a distinct techno-economic profile and has been assessed specifically for natural gas-producing regions. However, it remains at lower commercial maturity relative to SMR and ATR routes in the current dataset.

Patent activity and the Topsoe A/S IP position

Topsoe A/S (Denmark) is the dominant patent filer in the blue ammonia space within the analysed dataset, holding two blue ammonia method patents filed in Argentina in April and May 2025. Both patents claim broad applicability — explicitly stated as applicable to “any ammonia plant” — while the detailed process claims centre on ATR-based reforming with high-percentage CO₂ capture and integrated water-gas shift. This IP position is reinforced by Topsoe’s role as the commercial benchmark technology provider: the company originally commercialised ATR for ammonia production, and its process is cited as the reference point in the academic literature.

“Future IP competition in blue ammonia will centre on capture efficiency metrics, not just cost — the 2025 Topsoe patents explicitly frame ‘higher percentage of carbon capture’ as the central innovation claim.”

The second notable filing actor is individual inventor Leonid Surguchev, who holds a 2024 WO-jurisdiction PCT-stage patent covering blue ammonia production from offshore stranded gas fields using ATR. This represents an emerging application sector where blue ammonia enables monetisation of remote gas reserves that cannot economically support pipeline infrastructure. Crucially, Surguchev’s filing is the only patent in the dataset specifically targeting the offshore domain — representing a potential white space for oil and gas majors and engineering firms.

The geographic concentration of Topsoe’s filings in Argentina is notable. This likely reflects Argentina’s growing role as a natural gas producer and potential blue ammonia export market, or a broader Latin American IP filing strategy, rather than production domicile. The academic and policy literature originates from European (Nordic and Baltic), Middle Eastern (Qatar), and Latin American (Colombia) research groups — the regions most actively analysing blue ammonia deployment scenarios. According to the WIPO patent system, PCT filings such as the Surguchev WO patent allow subsequent national phase entries across participating jurisdictions, providing broad geographic coverage from a single international application.

Application domains: fertilizer, energy carrier, shipping, and offshore gas

Blue ammonia’s application landscape spans four distinct domains, each with different drivers, timelines, and technology requirements. Fertilizer production is the foundational near-term market; energy carrier and shipping applications represent the medium-term growth story; offshore gas field monetisation is an emerging niche with significant strategic upside.

Fertilizer Production

Fertilizer is the dominant and most immediately addressable application. Blue ammonia directly substitutes conventional gray ammonia in existing synthesis pathways, with current Haber-Bosch infrastructure requiring minimal modification. The 183 million tonnes per year ammonia fertilizer market is the primary near-term addressable volume. As standards bodies such as ISO develop lifecycle assessment methodologies for low-carbon fertilizers, the ability to document CCS-verified emissions reductions will become increasingly important for market access in regulated jurisdictions.

Energy Carrier and Hydrogen Transport

Ammonia’s physical properties make it a preferred hydrogen carrier for intercontinental energy trade. Ammonia liquefies at −33°C at atmospheric pressure, compared to −253°C for liquid hydrogen, dramatically reducing storage and transport costs. Multiple sources in the dataset project ammonia demand growth in hydrogen transport and power generation as part of 1.5°C decarbonisation pathways.

Marine Fuel and Shipping Decarbonisation

Blue ammonia is identified in the dataset as a promising zero-carbon maritime fuel candidate. A 2023 study on ammonia as alternative energy for the Baltic Sea region notes that disruptions in global ammonia supply — including Russian ammonia import restrictions following the Ukraine conflict — have accelerated investment in domestic production capacity across Baltic Sea and Nordic countries. International regulatory pressure from the IMO on shipping emissions has further reinforced interest in ammonia as a marine fuel.

Offshore and Stranded Gas Field Monetisation

The 2024 WO patent by Surguchev specifically targets stranded offshore gas fields, where produced natural gas is reformed to blue ammonia on-site for export, rather than being flared or re-injected. This configuration solves the pipeline infrastructure problem for remote gas reserves. In the analysed dataset, this is the only patent filing in this domain — representing an identifiable white space for oil and gas majors, engineering firms, and technology licensors to develop and protect offshore-specific process configurations.

Resource-Rich National Hydrogen Economies

Qatar, Colombia, and Baltic Sea states are explicitly cited in the dataset as candidate blue ammonia producers, leveraging domestic natural gas reserves combined with CCS infrastructure. Qatar’s analysis is the most quantified: blue ammonia production in Qatar is projected to reduce national GHG emissions from 7.5 Mt CO₂ under a gray ammonia baseline to 4.22 Mt CO₂ by 2030 — a reduction of approximately 44%. These national roadmaps create a policy-driven demand signal that differs structurally from market-driven green ammonia deployment.

The 2025–2035 deployment window and competitive cost dynamics

The 2025–2035 period represents the critical deployment window for blue ammonia investment, before projected green ammonia cost curves reach competitiveness at optimal sites. Studies in the dataset estimate green ammonia costs declining to approximately €260–290 per tonne NH₃ by 2050, a level that will eventually undercut blue ammonia at the best solar and wind resource locations. Investment decisions for new blue ammonia capacity must therefore be made and de-risked within this window to achieve acceptable asset utilisation lifetimes.

The innovation timeline in the dataset mirrors the maturation of the deployment argument. Foundational economic framing work appeared in 2020–2021, establishing techno-economic baselines. Technology benchmarking consolidated in 2022, with multiple comparative assessments across SMR, ATR, and NGD pathways at a 607 tonnes per day plant scale. By 2023, studies shifted toward ammonia economy roadmaps and demand growth scenarios. The most recent phase — 2024 to 2025 — has seen the transition from academic benchmarking to active IP protection of specific process configurations, signalling that commercialisation is underway.

CO₂ storage infrastructure availability — not reforming technology maturity — is identified as the binding constraint for blue ammonia deployment. In markets where geological CO₂ sequestration capacity is limited or unregulated, such as some Latin American markets, blue ammonia cannot achieve its full GHG reduction potential regardless of process innovation. Research published by institutions including IEA underscores that CCS policy frameworks and storage certification are prerequisites for bankable blue hydrogen and blue ammonia projects. IP and market strategies for blue ammonia must therefore be paired with active engagement on CCS policy and storage permitting.

ATR is emerging as the preferred reforming technology for new blue ammonia capacity over SMR, driven by its superior CO₂ capture integration economics. R&D teams designing new capacity should evaluate ATR-first architectures rather than retrofitting existing SMR units, particularly for greenfield projects. The PatSnap R&D intelligence platform enables teams to map the full ATR patent family landscape and identify potential freedom-to-operate risks before committing to a technology architecture.