Seabound Launches World-First Onboard Marine Carbon Capture Project with Hartmann, InterMaritime, and Heidelberg Materials

July 17, 2025

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(Seabound/PR Newswire) Captured carbon on cement-carrying ship to serve as limestone input at Heidelberg Materials pioneering cement plant in Brevik, Norway -- Seabound, a UK-based leader in marine carbon capture, has launched a first-of-its-kind onboard carbon capture project in partnership with Hartmann Group ("Hartmann"), InterMaritime Group ("InterMaritime"), and Heidelberg Materials Northern Europe.

The solution equips the UBC Cork, a 5,700 gross tonne (GT) cement-carrying ship owned by Hartmann and managed by InterMaritime, with Seabound's compact carbon capture system. The captured carbon — bound in limestone and thus stored safely onboard — will be offloaded at the Port of Brevik, Norway, and used in Heidelberg Materials' Brevik cement plant.

Recently inaugurated, this world-first industrial-scale carbon capture facility in the cement industry will produce net-zero concrete.

Seabound is deploying its compact marine carbon capture system aboard the UBC Cork (pictured), a 5,700 GT cement carrier owned by Hartmann Group, managed by InterMaritime Group, and chartered out to Heidelberg Materials. The captured carbon will be offloaded as limestone at the Port of Brevik, Norway, for use at Heidelberg Materials’ nearby cement plant.

Marine shipping accounts for nearly 3% of global CO₂ emissions, making it one of the most carbon-intensive and difficult-to-decarbonize sectors. In April, the International Maritime Organization (IMO) introduced a global carbon price of up to $380 per tonne of CO₂, further adding pressure to shipowners. With few scalable alternatives to heavy fuel oil and existing efficiency measures proving insufficient, shipowners and global brands are seeking viable solutions to cut maritime emissions and meet ambitious climate goals.

Seabound's containerized carbon capture system uses calcium looping technology to capture up to 95% of CO₂ and 98% of sulphur emissions from ship exhaust. The process uses calcium hydroxide, derived from calcium oxide and commonly known as slaked lime, to absorb CO₂ and convert it into limestone that is stored onboard until returning to port. The containerized system allows for easy installation with minimal vessel modification and is suitable for all vessel types. This design decouples carbon capture from post-processing, resulting in lower energy requirements, faster deployment, and reduced cost compared to traditional liquefied CO₂ systems.

"We're proud to partner with industry leaders like Heidelberg Materials and Hartmann to deliver scalable carbon capture solutions," said Alisha Fredriksson, CEO and Co-founder of Seabound. "We're especially excited to be advancing this work in Brevik, a strategic location that's rapidly establishing itself as a global hub for CCS with Heidelberg's world-first facility and the Northern Lights pick up point. Together, we're demonstrating how onboard carbon capture can accelerate emissions reductions in carbon-intensive sectors."

The carbon captured on the UBC Cork will be offloaded as limestone at Heidelberg Materials' Brevik plant, where it will serve as an input in the production of carbon captured cement, which enables net-zero concrete. The Brevik CCS facility is already operational, capturing 400,000 tons of CO2 annually. CO2 transport and storage are provided by Northern Lights, the world's first cross-border CO₂ storage hub beneath the North Sea. As part of its Net Zero strategy, Heidelberg Materials is committed to decarbonising their maritime transport and supply chain, targeting a substantial reduction in CO₂ emissions from 2020 levels.

"Shipping cement is emissions-intensive, and Seabound's system gives us a clear path to reduce those Scope 3 emissions while enhancing our circular use of captured CO₂," said Lars Erik Marcussen, Project Manager, Logistics at Heidelberg Materials Northern Europe. "This project brings us one step closer to also decarbonising the logistics/transport part of our operations."

The collaboration marks a significant step forward, setting the stage for deeper cooperation between the partners. Heidelberg Materials aims to reduce its Scope 3 emissions from maritime transport by using a variety of methods — including Seabound's carbon capture technology — to accelerate its path to net-zero. Meanwhile, Hartmann's early adoption provides crucial operational expertise and strategically positions the company to meet evolving regulatory demands. Together, Seabound and Hartmann are committed to expanding carbon capture solutions throughout Hartmann's fleet, driving meaningful decarbonisation in maritime shipping.

"Hartmann is committed to embracing and investing in environmentally friendly technologies that reduce our maritime carbon footprint and promote sustainability," said Captain Jayant Singh, Director, Pool Manager Operations at Hartmann Group. "By integrating innovative, eco-conscious solutions into our ship owning operations, we aim to contribute positively to the environment while delivering long-term value to the maritime industry and all of our stakeholders."

"This collaboration will play a key role in advancing carbon capture technology and accelerating its adoption in the shipping industry, marking a critical step toward realising a low-emission future for maritime transport," added Dieter Rohdenburg, CEO of Intership Navigation Co. Ltd., a member of InterMaritime.

The project is co-funded by the Eurostars partnership on Innovative SMEs which is part of Horizon Europe through the Cyprus Research and Innovation Foundation. This funding supports collaborative R&D projects that drive innovation in a range of industries, including maritime transport. The consortium of funding recipients supporting this initiative includes the Cyprus Marine and Maritime Institute ("CMMI"), a centre of excellence in maritime research with an interest in advancing new decarbonisation technologies.

Seabound completed its first onboard carbon capture pilot with Lomar Shipping and Hapag Lloyd, successfully capturing CO₂ at ~80% efficiency onboard a 3,200 twenty-foot equivalent unit (TEU) container vessel. The company also showcased its technology for port-based emissions capture alongside STAX Engineering at an event in the Port of Long Beach, California in April. Building on this momentum, Seabound is currently building its first full-scale systems to be delivered initially to Hartmann and used in the transport of Heidelberg Materials' cement from the Brevik plant. Seabound is expanding its presence in Europe and leveraging favourable regulatory conditions to accelerate maritime decarbonisation.

Seabound is on a mission to capture 100 million tonnes of CO₂ annually by 2040, representing 10% of the global shipping sector's emissions. The company continues to engage shipowners, cargo companies, and industrial players across the supply chain to expand adoption and maximize impact. For more information visit www.seabound.co or contact press@seabound.co.

About Seabound

Seabound is an award-winning leader in carbon capture systems for ships. Founded in late 2021, Seabound recently completed the world's first port-based CO₂ capture demonstration at the Port of Long Beach with STAX Engineering. Previously, the company completed a world-first pilot with Lomar Shipping and Hapag-Lloyd, capturing CO₂ at ~80% efficiency on a container ship in the Middle East. To date, Seabound has raised $6.8M from world-class investors including Lowercarbon Capital, Y Combinator, Eastern Pacific Shipping, Elemental Impact, and Collaborative Fund, and received £1.2M in grant funding from the UK Government through the Clean Maritime Demonstration Competition. Learn more at seabound.co.

About Hartmann Group

The Hartmann Group is an independent, family-owned shipping company, operating worldwide. Its business is based on several foundations: ship owning, full technical and commercial ship management as well as crewing and training. Driven by operational efficiency and environmental responsibility, the companies of the Group control a versatile fleet of eco-friendly gas carriers and container ships, bulk carriers and pneumatic cement carriers. The Group aims to reduce emissions and reinforce their commitment to greener shipping through strategic maritime technology partnerships.

About InterMaritime Group

InterMaritime Shipmanagement, the global, independent ship manager recently formed by the merger of Intership Navigation Ltd. and Interorient Shipmanagement, offers comprehensive technical and crew management services for a diverse fleet, including dry bulk, tankers, gas carriers, and cement carriers. In addition to traditional ship management, the InterMaritime Group also provides specialized services such as new building & conversion supervision, decarbonisation advisory, marine insurance brokerage, and commercial management. With a focus on innovation, sustainability, and operational efficiency, InterMaritime is committed to delivering excellence and customer satisfaction to the evolving maritime industry.

About Heidelberg Materials

Heidelberg Materials is one of the world's largest integrated manufacturers of building materials and solutions with leading market positions in cement, aggregates, and ready-mixed concrete. We are represented in more than 50 countries with around 51,000 employees at almost 3,000 locations. At the centre of our actions lies the responsibility for the environment. As the front runner on the path to carbon neutrality and circular economy in the building materials industry, we are working on sustainable building materials and solutions for the future. We enable new opportunities for our customers through digitalisation. READ MORE