Materials for Direct CO₂ Capture in 2026: Sorbents Moving Beyond Pilot Projects

Direct air capture (DAC) has shifted from experimental installations to early-stage industrial deployment. The key factor behind this transition is not only engineering scale, but also material science. In 2026, several classes of sorbents have demonstrated stability, cost efficiency, and regeneration performance that make them viable outside pilot environments. This article examines which materials are progressing into real-world systems, how they operate, and what limitations still define their scalability.

Solid sorbents: amine-functionalised materials and their evolution

Amine-based solid sorbents remain the most mature technology for capturing CO₂ directly from ambient air. These materials typically consist of porous supports such as silica, alumina, or polymer frameworks functionalised with amine groups. The chemical interaction between CO₂ and amines allows efficient capture even at low atmospheric concentrations, which is critical for DAC systems.

In 2026, the focus has shifted from basic adsorption efficiency to long-term durability and energy requirements during regeneration. Advanced variants now include grafted amines with improved resistance to oxidation and moisture. Companies operating commercial DAC units increasingly rely on these upgraded materials, as they demonstrate stable performance over thousands of cycles.

Another important development is the reduction of heat demand during desorption. New formulations enable CO₂ release at lower temperatures, typically below 100°C, which allows integration with low-grade waste heat or renewable sources. This directly affects operational costs and determines whether DAC can scale economically.

Challenges of solid sorbents under real operating conditions

Despite progress, solid sorbents still face degradation over time, especially in environments with fluctuating humidity. Water can both enhance and hinder CO₂ capture depending on the material design, creating inconsistencies in performance across different climates.

Mechanical stability is another issue. Repeated thermal cycling leads to structural fatigue in porous supports, reducing surface area and adsorption capacity. Research in 2026 increasingly focuses on hybrid materials that combine inorganic stability with organic functionality.

Cost remains a constraint. While performance has improved, large-scale deployment requires mass production of these materials at significantly lower prices. Efforts to use abundant raw materials and scalable synthesis methods are central to current industrial strategies.

Liquid sorbents: alkaline solutions and carbonate systems

Liquid sorbents, particularly based on alkaline solutions such as potassium hydroxide (KOH), have been used in several large DAC installations. These systems capture CO₂ through chemical reactions that form carbonates, which are then processed to release concentrated CO₂.

In 2026, improvements focus on process integration rather than fundamental chemistry. Closed-loop systems now minimise solvent loss and reduce energy consumption during regeneration. This has allowed some facilities to move beyond pilot scale and operate continuously.

Liquid systems are particularly suitable for large, centralised installations due to their scalability and established industrial handling methods. However, they require more complex infrastructure compared to solid sorbents, including reactors, pumps, and separation units.

Energy intensity and infrastructure considerations

The main limitation of liquid sorbents is the high energy demand for regeneration, often involving calcination at temperatures above 800°C. Even with optimisation, this remains a significant barrier to widespread adoption without low-carbon energy sources.

Water consumption is another factor. Large-scale systems require substantial volumes of water, which can be problematic in arid regions. This restricts site selection and adds logistical complexity.

Additionally, the overall system footprint is larger than that of modular solid sorbent units. This makes liquid-based DAC less flexible but potentially more efficient when deployed at industrial hubs with existing infrastructure.

Emerging materials: metal-organic frameworks and hybrid systems

Metal-organic frameworks (MOFs) have been widely studied for CO₂ capture due to their high surface area and tunable chemistry. In 2026, several MOF-based sorbents are transitioning from laboratory research to demonstration-scale applications.

These materials offer precise control over pore size and functional groups, enabling selective CO₂ adsorption even in the presence of other gases. Some MOFs also show improved performance under humid conditions, addressing one of the main limitations of earlier designs.

Hybrid systems combining MOFs with polymers or inorganic supports are gaining attention. These composites aim to balance performance with mechanical stability and cost, making them more suitable for industrial use.

Scalability and economic feasibility of advanced sorbents

The primary challenge for MOFs is production cost. Many synthesis methods rely on expensive precursors and complex processes, which are not yet compatible with mass manufacturing. Efforts in 2026 focus on simplified synthesis routes and the use of cheaper metals.

Another issue is long-term stability. While laboratory results are promising, real-world conditions expose materials to temperature fluctuations, contaminants, and mechanical stress. Demonstration projects are now providing critical data on durability.

Even with these challenges, MOFs represent one of the most promising directions for next-generation DAC systems. Their adaptability allows continuous optimisation, and ongoing research suggests that cost barriers may decrease as production scales increase.