Demonstration Tests Confirm Successful Integration of Maritime Emissions and Carbon Capture Technologies
Recently conducted demonstration tests at the Port of Long Beach have showcased the successful combination of maritime emissions capture with carbon capture for vessels at berth. This innovative project is a collaboration between STAX Engineering, a leading maritime emissions capture and control technology company based in California, and Seabound, a UK-based pioneer in onboard carbon capture solutions. The joint effort aims to provide a comprehensive and cost-effective solution for the maritime industry.
The trials for this groundbreaking solution commenced in March 2025, with three iterations conducted, including partnerships with Wallenius Wilhelmsen and NYK Line. The most recent demonstration, held in Long Beach on April 16, involved a RoRo vehicle carrier operated by Wallenius Wilhelmsen, marking the successful completion of the final trial for the end-to-end modular solution.
The integrated system combines STAX’s mobile emissions control unit, which effectively removes 99 percent of particulate matter and 95 percent of Nox from a vessel’s exhaust, with Seabound’s carbon capture technology. By connecting directly to the vessel’s exhaust pipe, STAX technology purifies the exhaust gases by removing criteria pollutants before directing them through Seabound’s capture unit. This unit isolates and stores up to 95 percent of carbon and 90 percent of sulfur, ensuring that only clean exhaust is released back into the environment. Independent verification of the results was carried out by Yorke Engineering, an environmental consultancy.
“Our partnership demonstrates that effective and scalable emissions solutions are not just a vision but a reality that can be implemented now,” stated Alisha Fredriksson, co-founder and CEO of Seabound.
STAX, launched in early 2024, has positioned itself as a leading emissions solution provider for all major vessel classes in California. The company has facilitated CARB compliance in five major ports and has successfully captured over 126 tons of pollutants to date. With CARB expanding its in-port emissions regulations to cover all merchant ship classes, STAX’s role in emissions control is becoming increasingly vital.
STAX’s operational approach involves positioning a barge alongside the vessel to capture emissions by placing a cap on the funnel. The company is set to deploy its eighth barge this month and has recently secured $70 million in funding to accelerate fleetwide carbon capture integration and international expansion efforts.
On the other hand, Seabound, founded in late 2021, has demonstrated its onboard carbon capture technology successfully. The company recently collaborated with Lomar Shipping and Hapag Lloyd to install its system for onboard carbon capture, achieving an impressive 80 percent efficiency in capturing CO2 on a 3200 TEU container vessel. Seabound is gearing up to launch its first full-scale commercial carbon capture systems later this year.
“Today marks a significant milestone in our journey towards a zero-emissions future, and it’s just the beginning of a global maritime emissions solution,” said STAX CEO Mike Walker. He emphasized the pivotal role of the partnership with Seabound and expressed eagerness to collaborate with ABP in the Port of Southampton.
STAX and Seabound have announced their continued partnership in the Port of Southampton in the UK. In March 2025, ABP welcomed both companies into its Energy Ventures Accelerator program, designed to support clean energy hardware startups in cleaning up ABP’s ports nationwide as part of the organization’s Net Zero by 2040 initiative.