Direct Ocean Carbon Capture 2026 — PatSnap Eureka
Direct Ocean Carbon Capture: Technology Landscape 2026
From ocean alkalinity enhancement and deep injection to ship-based CCS and biological pump augmentation — explore the full direct ocean carbon capture innovation landscape across 2009–2026 patent and literature records.
How Direct Ocean Carbon Capture Works
Direct ocean carbon capture (DOCC) encompasses a suite of engineered and nature-assisted technologies that use the ocean as an active medium for removing CO₂ from the atmosphere or directly from seawater. The ocean is both a passive sink — absorbing roughly 25–30% of anthropogenic CO₂ annually via natural carbonate chemistry — and, increasingly, a target for active engineering interventions designed to accelerate that uptake or store captured carbon in the deep column.
The field has accelerated rapidly in response to IPCC net-zero mandates and the 2022 launch of the UN Global Ocean Negative Carbon Emissions (Global-ONCE) program, making scalable marine CDR one of the most contested and rapidly evolving frontiers in climate technology. PatSnap's materials and chemicals intelligence tools are increasingly applied to track innovation in this space.
A cross-cutting infrastructure layer — autonomous ocean monitoring systems, satellite CO₂ flux observation, and alkalinity sensors deployed on ships of opportunity — underpins MRV (measurement, reporting, and verification) for all approaches. The UNESCO/IOC Global-ONCE program institutionalized ocean CDR as a decade-scale research priority in 2022, integrating microbial carbon pumps, biological and carbonate counter pumps, and engineering solutions.
- Four principal mechanistic pathways identified across 2009–2026 records
- MRV infrastructure underpins all approaches — now the critical IP battleground
- Ship-based CCS within 5 years of demonstration-scale deployment
- Asia-Pacific accelerating patent activity with 2 of 4 most recent filings from JP jurisdiction
Innovation Signals Across DOCC Technology Clusters
Key quantitative signals extracted from 2009–2026 patent and literature records via PatSnap Eureka, spanning CDR potential, capture economics, and technology maturity.
Biological CDR Potential: MOS vs MOS + Upwelling (PgC, 2020–2100)
GEOMAR modelling under RCP4.5 shows macroalgae sinking alone delivers 270 PgC; combined with artificial upwelling this rises to 447 PgC over 2020–2100.
Ship-Based CCS: Capture Cost vs Efficiency by Technology
ETH Zurich (2022) demonstrates 94% net capture efficiency at $85/tCO₂ for chemical absorption. OTEC-based seawater extraction estimated at €15–35/tonne (Utrecht University).
Geographic Innovation Distribution by Region (DOCC, 2009–2026)
Europe leads in academic/institutional output (OAE, macroalgae CDR, ship-based CCS). Asia-Pacific accounts for 2 of the 4 most recent patent filings (JP jurisdiction, 2024–2025).
OAE Sequestration Timescale: Olivine Dissolution at 5 Pg/yr
AWI modelling shows that annually dissolving 5 Pg of olivine compensates anthropogenic CO₂ from a high-emission scenario after 3,500 years — illustrating the multi-millennial horizon of OAE approaches.
Four Principal DOCC Mechanistic Pathways
Each cluster represents a distinct physical or chemical approach to ocean-based carbon removal, with different maturity levels, IP concentration, and commercialisation timelines.
Ocean Alkalinity Enhancement (OAE)
Addition of alkaline minerals — olivine, slaked lime, limestone — to surface or deep seawater shifts carbonate equilibria, increasing bicarbonate and carbonate ion concentrations, reducing pCO₂ at the surface, and drawing additional CO₂ from the atmosphere. Olivine dissolution also releases iron and silicic acid, creating a secondary biological fertilization effect. Records span Mediterranean deployment scenarios to global millennia-scale projections. Key contributors: Alfred-Wegener-Institut (AWI), CSIRO, Politecnico di Milano.
OAE ecological risk governance gap identified — white space for IPDeep Ocean Direct Injection & CO₂ Pumping
CO₂ captured at point sources is physically transported to deep ocean layers (>1,000 m) where pressure conditions favour hydrate formation or dissolution into ambient water. A novel 2022 approach redistributes surface ocean acidity to the deep column — without adding external alkalinity — accelerating carbonate homeostasis and minimizing conveyed material volumes. GEOMAR simulated 70 GtC injection over 100 years across depth variants. MIT's 2009 acute impact assessment remains a reference point for toxicity thresholds.
Surface acidity redistribution — novel low-materials-transport pathwayBiological Carbon Pump Enhancement
Stimulating phytoplankton productivity via iron fertilization, macroalgae cultivation, or nutrient upwelling enhances the biological carbon pump, exporting organic carbon to the deep ocean as particulate matter. GEOMAR projects MOS CDR potential of 270 PgC globally (2020–2100) under RCP4.5, boosted to 447 PgC combined with artificial upwelling. Engineered nanoparticles (iron, SiO₂, Al₂O₃) are proposed to enhance phytoplankton aggregation at costs estimated 2–5× lower than conventional iron fertilization (Pacific Northwest National Laboratory). IP-thin relative to other clusters.
Scientifically contested — primarily academic literature, limited patentsShip-Based & Offshore Platform CCS
Onboard capture systems intercept CO₂ in ship exhaust streams using post-combustion amine scrubbing, membrane separation, temperature swing adsorption, or methanol reforming/pre-combustion approaches. Captured CO₂ is liquefied and stored aboard for transfer to shore-side sequestration. ETH Zurich's 2022 analysis demonstrates 94% net CO₂ capture efficiency at $85/tCO₂ for chemical absorption on cargo ships. IMO 2030 (−40%) and 2050 (−70%) targets drive demand. The 2025 Zhejiang University patent integrates methanol steam reforming, membrane CO₂ separation, and onboard liquefaction — eliminating high-pressure hydrogen storage risk. PatSnap's life sciences and energy intelligence tools track CCS patent activity across jurisdictions.
Near-commercial — within 5 years of demonstration-scale deploymentWhere DOCC Technologies Are Being Deployed
Six distinct application domains emerge from 2009–2026 patent and literature records, spanning maritime decarbonization to carbon credit markets.
| Application Domain | Key Records / Assignees | Regulatory Driver | Maturity |
|---|---|---|---|
| Maritime Decarbonization & IMO Compliance | Ecospray Technologies, ETH Zurich, Delft University, University of Trieste, Cranfield University | IMO 2030 (−40%) and 2050 (−70%) targets | Near-commercial |
| Offshore Oil & Gas | Offshore Oil Engineering Co. Ltd (2021); membrane and chemical absorption for high-CO₂ gas streams; CO₂-EOR | Platform decarbonization mandates | Mid-stage |
| Open Ocean Climate Intervention | UNESCO/IOC Global-ONCE (2022); GEOMAR macroalgae MOS; AWI olivine; CSIRO OAE | IPCC net-zero mandates; UN Decade programs | Research-scale |
| Renewable Energy-Coupled CO₂ Extraction | École Polytechnique/CNRS Mediterranean methanol island (2022); Utrecht University OTEC (2021) | Synthetic fuel mandates; ReFuelEU | Nascent |
Track IMO compliance patent filings in real time
PatSnap Eureka monitors ship-based CCS patent activity across JP, EP, KR, and GB jurisdictions as IMO 2030 deadlines approach.
Five Forward-Looking Signals from 2022–2026 Filings
Based on the most recent patent filings and literature in this dataset, five innovation signals point toward the next phase of direct ocean carbon capture commercialisation.
Compact Methanol/Hydrogen Circular Carbon Systems (2025)
The Zhejiang University Jiaxing Research Institute JP patent (2025) integrates methanol steam reforming, membrane CO₂ separation, and onboard liquefaction into a single compact system — eliminating high-pressure hydrogen storage risk. This represents a shift from post-combustion retrofit to integrated fuel-and-capture architectures.
Ocean CDR Carbon Credit Quantification Infrastructure (2024)
Running Tide Technologies' 2024 JP patent deploys multi-sensor data fusion and ensemble modelling to generate verifiable carbon credit outputs from ocean interventions — signalling the beginning of a commercial MRV layer necessary to monetize DOCC approaches through voluntary or compliance carbon markets.
Engineered Nanoparticle Ocean Fertilization (2022)
Pacific Northwest National Laboratory's 2022 analysis identifies iron, SiO₂, and Al₂O₃ nanoparticles as potential enhancers of phytoplankton aggregation and deep-ocean carbon export, with estimated net CO₂ capture costs 2–5× lower than conventional iron fertilization. This represents a materials science entry point into biological CDR.
IP Strategy Priorities for DOCC in 2026
MRV is the critical chokepoint. Among all DOCC approaches in this dataset, the absence of standardized, high-confidence measurement and verification frameworks is the most consistently identified barrier. The 2024 Running Tide and 2021 Lucent Biosciences patent filings signal a nascent commercial MRV layer, but carbon credit eligibility for ocean-based CDR remains unresolved in major compliance markets. R&D teams and IP strategists should prioritize sensor fusion, autonomous monitoring, and quantification algorithm patents as the primary IP battleground for the next 3–5 years. PatSnap's IP analytics platform provides landscape mapping for emerging MRV patent clusters.
Ship-based capture is approaching commercialization. The concentration of 2021–2025 engineering literature and patent filings around onboard CCS reflects genuine IMO regulatory pressure. The 2025 Zhejiang University methanol-integrated system and ETH Zurich's $85/tCO₂ capture cost estimate suggest that ship-based capture is within 5 years of demonstration-scale deployment, making this the most near-term commercializable DOCC segment.
OAE faces an ecological risk governance gap. All retrieved OAE records acknowledge localized pH excursion risks in vessel wakes or deployment zones. No patent in this dataset claims an OAE delivery mechanism with integrated ecological impact control. This represents a white space for engineering innovation — particularly vessel-based alkalinity dosing systems with pH feedback control.
Asia-Pacific is accelerating patent activity. Two of the four most recent patent filings in this dataset originate from JP jurisdiction assignees. Combined with Korean offshore CCS infrastructure work, this signals a competitive IP filing dynamic in which US and European research leadership in ocean CDR may not translate into dominant patent positions without deliberate international filing strategies. PatSnap customers use cross-jurisdictional filing analysis to identify these gaps. Use PatSnap's open API to integrate DOCC patent data into your own IP workflows.
Direct Ocean Carbon Capture — key questions answered
Direct ocean carbon capture (DOCC) encompasses a suite of engineered and nature-assisted technologies that use the ocean as an active medium for removing CO₂ from the atmosphere or directly from seawater, spanning approaches from ocean alkalinity enhancement and direct injection to biological pump augmentation and ship-based capture systems.
The four principal mechanistic pathways are: (1) Ocean alkalinity enhancement (OAE) — addition of alkaline minerals to seawater to draw down atmospheric CO₂; (2) Deep ocean direct injection — physical transport of captured CO₂ to depths exceeding 1,000–3,000 m; (3) Biological carbon pump enhancement — iron fertilization, macroalgae mariculture, and artificial upwelling to stimulate phytoplankton productivity; and (4) Ship-based and offshore platform carbon capture — onboard capture of combustion exhaust CO₂ using amine scrubbing, membrane separation, methanol reforming, or molten carbonate fuel cells.
GEOMAR modelling projects macroalgae open-ocean mariculture and sinking (MOS) CDR potential of 270 PgC globally over 2020–2100 under RCP4.5, boosted to 447 PgC when combined with artificial upwelling.
ETH Zurich's 2022 analysis demonstrates 94% net CO₂ capture efficiency at $85/tCO₂ for chemical absorption on cargo ships.
Among all DOCC approaches, the absence of standardized, high-confidence measurement and verification (MRV) frameworks is the most consistently identified barrier. Carbon credit eligibility for ocean-based CDR remains unresolved in major compliance markets. R&D teams and IP strategists should prioritize sensor fusion, autonomous monitoring, and quantification algorithm patents as the primary IP battleground for the next 3–5 years.
The OTEC-based approach estimates levelized CO₂ capture costs of €15–35/tonne, substantially below current DAC cost estimates, if OTEC infrastructure can be co-located.
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References
- Ocean negative carbon emissions: A new UN Decade program — Institute of Marine Science and Technology, Shandong University, 2022, CN
- Alkalinization Scenarios in the Mediterranean Sea for Efficient Removal of Atmospheric CO2 and the Mitigation of Ocean Acidification — Politecnico di Milano, 2021, IT
- Assessing carbon dioxide removal through global and regional ocean alkalinization under high and low emission pathways — CSIRO Oceans and Atmosphere, 2018, AU
- Anthropogenic CO2 of High Emission Scenario Compensated After 3500 Years of Ocean Alkalinization With an Annually Constant Dissolution of 5 Pg of Olivine — Alfred-Wegener-Institut (AWI), 2020, DE
- Potential of Maritime Transport for Ocean Liming and Atmospheric CO2 Removal — Politecnico di Milano, 2021, IT
- An updated assessment of the acute impacts of ocean carbon sequestration by direct injection — Massachusetts Institute of Technology, 2009, US
- Revisiting ocean carbon sequestration by direct injection: a global carbon budget perspective — Geomar Helmholtz Centre for Ocean Research Kiel, 2016, DE
- CO2 capture by pumping surface acidity to the deep ocean — 2022
- Assessing the sequestration time scales of some ocean-based carbon dioxide reduction strategies — University of California, 2021, US
- Method for calculating net carbon capture from ocean iron fertilization — Lucent Biosciences, Inc., 2021, EP
- Carbon Dioxide Removal via Macroalgae Open-ocean Mariculture and Sinking: An Earth System Modeling Study — GEOMAR Helmholtz Centre for Ocean Research Kiel, 2022, DE
- Potential use of engineered nanoparticles in ocean fertilization for large-scale atmospheric carbon dioxide removal — Pacific Northwest National Laboratory, 2022, US
- Iron fertilisation and century-scale effects of open ocean dissolution of olivine in a simulated CO2 removal experiment — Alfred-Wegener-Institut, 2016, DE
- Systems, methods and applications of compact marine carbon capture based on the coupling of methanol reforming and highly efficient membrane separation — Zhejiang University Jiaxing Research Institute, 2025, JP
- A Review of On-Board Carbon Capture and Storage Techniques: Solutions to the 2030 IMO Regulations — Ecospray Technologies S.R.L., 2023, IT
- Navigating within the Safe Operating Space with Carbon Capture On-Board — ETH Zurich, 2022, CH
- Ship-Based Carbon Capture and Storage: A Supply Chain Feasibility Study — Delft University of Technology, 2022, NL
- Floating offshore carbon neutral electric power generating system using oceanic carbon cycle — Ross Gary, 2022, GB
- Systems and methods for quantifying and/or verifying ocean-based interventions for carbon dioxide sequestration — Running Tide Technologies, Inc., 2024, JP
- Mitigation of CO2 Emissions from Commercial Ships: Evaluation of the Technology Readiness Level of Carbon Capture Systems — University of Trieste, 2023, IT
- Enhance Ocean Carbon Observations: Successful Implementation of a Novel Autonomous Total Alkalinity Analyzer on a Ship of Opportunity — Kongsberg Maritime Contros GmbH, 2020, DE
- Offshore CO2 Capture and Utilization Using Floating Wind/PV Systems: Site Assessment and Efficiency Analysis in the Mediterranean — École Polytechnique / CNRS, 2022, FR
- Indirect air CO2 capture and refinement based on OTEC seawater outgassing — Utrecht University, 2021, NL
- The Progress of Offshore CO2 Capture and Storage — Offshore Oil Engineering Co., Ltd, 2021
- IPCC — Intergovernmental Panel on Climate Change
- International Maritime Organization (IMO) — GHG Reduction Strategy
- UNESCO/IOC — Global Ocean Negative Carbon Emissions (Global-ONCE) Program
- Pacific Northwest National Laboratory (PNNL)
All data and statistics on this page are sourced from the references above and from PatSnap's proprietary innovation intelligence platform. This landscape is derived from a limited set of patent and literature records retrieved across targeted searches and represents a snapshot of innovation signals within this dataset only — it should not be interpreted as a comprehensive view of the full industry.
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