Establishing a circular carbon economy
Corinne Ziege, Global Product Director for Carbon Capture Systems at Nikkiso Clean Energy & Industrial Gases Group, Germany, considers how carbon capture can become a foundational element of a low-carbon economy.
22 September 2026
The path to net zero is often described as a transition away from fossil fuels toward renewable energy. While renewable power deployment remains critical for base load capability, achieving net zero requires a broader transformation of the energy system itself. Carbon dioxide remains embedded within energy infrastructure, industrial processes, and supply chains, making carbon management an essential component of long-term decarbonization.
As industries seek to reduce emissions while maintaining energy security and operational reliability, a new perspective is emerging: carbon should no longer be viewed solely as waste. Instead, carbon must become a managed resource that can be captured, purified, reused, and integrated into circular energy systems.
From this perspective, carbon capture is not a niche technology or a temporary bridge. It is a foundational element of a future low-carbon economy.
This principle presents the opportunity for technology and equipment providers to close both the energy loop and the carbon loop.
Decarbonization alone is not enough; the energy transition must also create pathways for circularity, enabling carbon and energy resources to remain productive within the economy rather than being released into the atmosphere.
One of the clearest examples of circular carbon utilization can be found in Power-to-X technologies.
Processes such as methanation use captured carbon dioxide and renewable hydrogen to produce synthetic methane; while emerging sustainable aviation fuel (SAF) pathways increasingly rely on captured carbon as a feedstock. These technologies demonstrate how carbon capture can enable renewable energy storage, fuel production, and emissions reduction simultaneously.
In these applications, carbon dioxide becomes a valuable raw material rather than an unwanted by-product. The ability to recover, purify, and condition CO2 therefore becomes a critical enabler of future clean-energy systems.
At the same time, energy systems are becoming increasingly decentralized. Driven by energy security concerns, geopolitical developments, and the need for resilient infrastructure, energy production is shifting towards localized and distributed assets.
This trend can already be seen across biomethane facilities, waste-to-energy plants, distributed hydrogen production systems, geothermal resources, and natural gas-fired generation supporting grid stability.
Figure 1 Decentralized small scale LNG liquefaction
While decentralization improves system resilience, it introduces a significant challenge for emissions management. Historically, carbon capture focused on a limited number of large industrial emission sources.
Future energy systems will generate emissions across a much larger number of smaller, geographically dispersed facilities. This creates what might be called the decentralization paradox: energy production becomes more local and resilient, while emissions management becomes more complex.
For this reason, retrofit and bolt-on carbon capture solutions are becoming increasingly important. Scalable carbon capture technologies allow operators to:
In many cases, retrofit carbon capture may represent the most practical pathway for accelerating near-term decarbonization while preserving existing infrastructure investments.
Figure 2 Containerized bolt-on liquid CO2 plant for a biogas plant.
The economics of carbon capture are evolving alongside the technology.
As carbon pricing mechanisms expand globally, emissions increasingly carry a measurable financial cost. Simultaneously, demand for high-purity carbon dioxide continues to grow across food and beverage production, healthcare, manufacturing, chemicals processing, and electronics industries.
This shift is changing the role of captured carbon. Rather than representing solely a compliance obligation, CO2 is becoming a tradable product with commercial value. High-purity carbon dioxide can command significantly higher market values than the costs traditionally associated with emissions management, creating opportunities to monetize captured carbon streams.
However, realizing this value requires more than simply separating carbon dioxide from a process stream. The purity of recovered CO2 is often the defining factor that determines its commercial viability.
Applications such as beverage carbonation, food processing, and medical use require carbon dioxide with purity levels approaching 99.9%, while semiconductor manufacturing and advanced industrial processes may demand purities of 99.9999% or greater.
Contaminants including sulfur compounds, oxygen, hydrocarbons, moisture, and trace substances must be carefully controlled to meet market requirements and protect downstream processes. As a result, purification technology is becoming a critical component of the carbon capture value chain.
Figure 3 Amine washing system for off gas treatment and CO2 capture for industrial decarbonization.
As carbon dioxide increasingly transitions from a regulated emission to a valuable industrial resource, purification requirements are becoming a key driver in the design of carbon capture systems. Compliance with internationally recognised standards, such as EIGA and ISBT, is an important consideration in developing solutions capable of supporting high-value CO2 utilization pathways.
A practical example of these challenges can be found in geothermal energy systems. Although geothermal power is widely recognized as a renewable energy source, geothermal gas streams often contain significant concentrations of carbon dioxide alongside water vapor, nitrogen, and other trace components.
These characteristics create a complex operating environment for gas treatment and purification technologies. For organizations seeking to maximize the value of recovered carbon dioxide, addressing these impurities with advanced gas treatment technologies specifically designed for CO2-rich environments becomes essential.
Experimental systems tested under geothermal conditions have demonstrated continuous carbon dioxide purification under industrially relevant operating parameters. These systems are designed to operate across a broad range of temperatures and pressures, reflecting the realities of geothermal energy production and other demanding industrial applications.
In addition to conventional contaminants, geothermal gas streams may contain naturally occurring radioactive species, such as radon. While present only at trace concentrations, radon can prevent captured CO2 from being used in food, beverage, medical, or semiconductor applications if not effectively removed.
Unlike conventional gas purification challenges, radon exists at extremely low concentrations within gas streams dominated by carbon dioxide and water vapor. Effective removal therefore requires highly selective adsorption materials capable of targeting heavy noble gases while minimizing competitive adsorption effects.
Recent developments in advanced carbon sorbent preparation techniques have shown promising results. By modifying sorbent surface chemistry, it is possible to reduce interactions with polar gases such as water vapor and carbon dioxide while improving selectivity toward heavy noble gases.
These advances support the production of higher-purity carbon dioxide streams suitable for industrial reuse and commercialization.
More broadly, they demonstrate that carbon capture and purification technologies can operate successfully in decentralized and highly variable energy environments.
The geothermal example illustrates a broader lesson for the energy transition.
Carbon capture should not be viewed as a standalone emissions-control technology. Instead, it is increasingly becoming a system-level enabler that connects energy production, industrial operations, and carbon utilization pathways.
Future decentralized energy facilities may integrate:
In this model, captured carbon dioxide becomes an asset capable of supporting food and beverage production, industrial manufacturing, healthcare applications, synthetic fuels, and future Power-to-X pathways.
The result is a more circular energy system in which carbon remains productive rather than being discarded.
While carbon utilization opportunities continue to expand, industrial sectors remain the primary drivers of carbon capture deployment.
Cement, steel, refining, chemicals, and other hard-to-abate industries face emissions that are fundamentally linked to their production processes. In many cases, carbon capture represents one of the few viable routes to deep decarbonization.
At the same time, decentralized energy systems are providing new opportunities to deploy carbon capture closer to the point of emission and closer to potential utilization markets.
The next phase of the energy transition will therefore require more than reducing emissions. It will require managing carbon as a resource across industrial and energy systems. For technology providers, industrial operators, and policymakers alike, the challenge is clear: build the infrastructure and technologies necessary to capture, purify, transport, utilize, and store carbon at scale.
By combining carbon recovery, purification, and utilization pathways, industries can transform emissions from a regulatory burden into an economic opportunity.
Net zero will ultimately depend not only on reducing carbon emissions, but on creating systems capable of managing carbon responsibly and productively. The future belongs to organizations that can successfully close both the energy loop and the carbon loop.
