From Smokestack to Skyscraper: Shipping's Carbon Becomes Concrete

SHANGHAI, CHINA – June 23, 2026 – The global shipping industry, a sector responsible for nearly 3% of the world's CO2 emissions, has long been searching for a viable path to decarbonization. While alternative fuels are a long-term goal, the existing fleet needs immediate solutions. A groundbreaking development from Shanghai may have just unlocked a critical piece of that puzzle, transforming a pollutant into a product and potentially creating a circular economy on the high seas.

This week, the International Maritime Organization (IMO) granted crucial 'in-principle support' to a novel approach pioneered by Shanghai Qiyao Technology Group Co., Ltd. The concept is as elegant as it is ambitious: capture carbon dioxide directly from a ship's exhaust and convert it into stable minerals, like calcium carbonate, that can be used as construction materials. This isn't just capture and storage; it's capture and utilization—a strategic shift that turns a costly liability into a valuable resource.

The endorsement came during the 84th session of the IMO's Marine Environment Protection Committee (MEPC 84), where Qiyao's proposals were welcomed. For an industry grappling with the high costs and logistical nightmares of traditional carbon capture solutions, this nod from the world's maritime regulator is more than just a procedural step; it’s a signal that a pragmatic, commercially attractive decarbonization pathway is finally coming into view.

A New Blueprint for Carbon Capture

For years, the conversation around onboard carbon capture and storage (OCCS) has been dominated by a single model: capture CO2, liquefy it, and offload it at a port for injection into deep underground geological formations. This method, however, is fraught with challenges. The infrastructure for transport and geological storage is scarce, expensive to build, and raises long-term questions about potential leakage.

Shanghai Qiyao's technology sidesteps these issues entirely by embracing mineralization. The process mimics a natural geological phenomenon, but accelerates it within a controlled system. Captured CO2 is chemically reacted with minerals to form inert, stable carbonates—the same compound found in limestone and marble. The key difference is that this process offers permanent sequestration with no risk of the CO2 escaping back into the atmosphere.

What truly sets this apart is the end product. Instead of a waste stream requiring costly disposal, the system generates a marketable commodity. To prove the concept's viability beyond the lab, Qiyao has already fitted a full-scale OCCS system aboard a 14,000 TEU container vessel. In a world-first, the company successfully completed a full-chain demonstration, including the capture, the ship-to-ship transfer of the captured liquid CO2, and its subsequent transport to an onshore facility for mineralization. The data from this trial, presented to the IMO in document MEPC 84/INF.8, provided a verifiable and traceable blueprint for how this ecosystem can function in the real world.

"We see this IMO attention as an important step," said the head of Qiyao's OCCS team. "Closing the loop from shipboard capture to onshore mineralisation can make carbon accounting more practical and economically attractive for the industry."

The IMO's Pivotal Green Light

The 'in-principle support' from MEPC 84 is a critical validation. It formally recognizes mineralization as a form of permanent sequestration, placing it on a par with geological storage within the IMO's developing regulatory structure. This is a game-changer for shipowners, who now have a clearer line of sight toward a compliant and potentially profitable decarbonization technology.

The regulatory wheels are already in motion. MEPC 84 established a Correspondence Group to continue the technical work on a comprehensive OCCS framework, with a report due for MEPC 86. The goal is to have formal guidelines finalized by 2028. This work will run in parallel with the development of the IMO's broader Life Cycle GHG Assessment (LCA) framework, which will determine how emissions reductions from technologies like OCCS are accounted for under future regulations, including the global fuel standard and emissions pricing mechanism set to take effect.

Anticipating this, classification societies are not waiting. DNV, for instance, has already published a recommended practice (DNV-RP-0698) to standardize the verification of OCCS performance. This proactive development of standards by industry bodies signals strong confidence in the technology's future role. Qiyao’s technical proposal, MEPC 84/7/18, provided the scientific underpinning for the IMO’s confidence, making a robust environmental case for mineralization as a secure and permanent storage solution.

From Costly Burden to Commercial Opportunity

The strategic brilliance of Qiyao's model lies in its economic calculus. By creating a revenue stream from captured carbon, it fundamentally alters the decarbonization equation. Shipping companies can potentially offset the significant capital and operational expenditures of an OCCS system with the sale of the resulting carbonate minerals to the construction industry.

This creates a powerful incentive for adoption and helps build the business case for investment. However, realizing this vision at scale will require significant investment in port-side infrastructure. While the ship-to-ship transfer demonstration proved the concept, a global network of ports equipped to receive liquid CO2 and onshore facilities to process it into building materials must be established. The scale of this challenge is significant, but the potential payoff is enormous. A DNV analysis suggests that equipping just 20 of the world's largest ports with CO2 offloading infrastructure could cut the world fleet's total emissions by 9%.

This approach positions shipping not as an isolated polluter, but as a potential supplier for a more sustainable construction sector. It's a holistic vision that aligns with the principles of a circular economy, where waste from one industry becomes feedstock for another. This synergy could de-risk investment and accelerate the transition for both sectors.

Charting the Course for a Greener Fleet

Shanghai Qiyao Technology Group is not an accidental player in this space. The mineralization breakthrough is part of a much broader corporate strategy focused on delivering a suite of solutions for shipping's 'energy upgrade' and 'low-carbon transition.' With a portfolio spanning green fuel power systems, energy efficiency solutions, and core LNG products, the company is positioning itself as an integrated technology partner for the maritime industry's green future.

While competitors like Mitsubishi, Wärtsilä, and others are advancing their own OCCS solutions, most remain tethered to the conventional capture-and-store model. Qiyao's focus on mineralization provides a powerful differentiator, bolstered now by the IMO's regulatory endorsement. The successful demonstration on a massive container ship proves this is not a distant theoretical possibility but a technology that is ready for deployment.

The path ahead involves navigating the final stages of IMO rulemaking and fostering the global partnerships needed to build out the required onshore infrastructure. Yet, for the first time, the maritime industry has a clear, tangible, and economically compelling model for what to do with the CO2 it captures. The vision of turning a ship's exhaust into the building blocks of our future cities is no longer science fiction; it is becoming a strategic reality.