What Makes Activated Carbon the Preferred Sorbent for Carbon Capture?

Dr. Yonit Boguslavsky, Head of R&D

The escalating levels of carbon dioxide (CO2) emissions have led to a global urgency in combating climate change. Finding efficient and sustainable methods for CO2 capture is paramount in addressing this pressing concern. Among the various techniques, solid sorbents, particularly activated carbon-based sorbents, have emerged as a promising and effective solution for carbon capture. In this blog post, we explore the reasons why activated carbon such as Dotz Earth is the preferred sorbent for CO2 capture.

The Limitations of Competing Sorbents

Before delving into the advantages of activated carbon, it is essential to understand the limitations of other solid sorbents considered for CO2 capture. Amine-based sorbents, zeolites, metal-organic frameworks (MOFs), silica-based sorbents, and calcium-based sorbents all demonstrate certain drawbacks such as corrosion issues, sensitivity to humidity, complex synthesis processes, high production costs, and energy-intensive regeneration requirements. These limitations hinder their widespread adoption and scalability for large-scale industrial applications.

While developing Dotz Earth, we were looking for an alternative material that has the potential to address these drawbacks and offer superior performance.

The Dotz Earth Activated Carbon Sorbent
Abundant and Renewable:

The Dotz Earth sorbent is synthesized using pyrolysis, a well-known and technically mature process, which converts waste plastics into a highly porous carbon material. This proprietary pyrolysis process utilizes certain potassium salts to produce pyrolysis oils and gases, enabling energy recycling and cost reduction. The use of waste plastics ensures a sustainable and abundant feedstock for the production of activated carbon sorbents, eliminating the reliance on rare or limited resources.

Tailorable Surface Properties:

Surface characteristics are vital for efficient CO2 capture. The Dotz Earth sorbent surface can be easily modified using chemical activation, surface functionalization, and pore size engineering to enhance its affinity for CO2 adsorption. This tunable surface allows for the optimization of CO2 capture capacity and selectivity, making Dotz Earth a highly efficient sorbent.

High Adsorption Capacity:

The unique structure of the Dotz Earth sorbent, consisting of micropores and mesopores, provides a large internal surface area. This structure enables a substantial number of CO2 molecules to interact and be captured, resulting in a high adsorption capacity.

Regenerability and Reusability:

Activated carbon sorbents offer exceptional regenerability, allowing for cyclic CO2 capture processes. After adsorbing CO2, the sorbent can be easily regenerated by applying heat, vacuum, or a combination of both, facilitating the release of CO2 for storage or utilization purposes. This regenerability enhances the economic viability and environmental sustainability of carbon-based sorbents.

Versatility and Compatibility:

Carbon-based sorbents, including Dotz Earth, exhibit compatibility with a wide range of CO2 sources and capture conditions. They can be employed to capture CO2 from power plants, industrial facilities, and even directly from the atmosphere. Their robustness ensures effective performance under diverse temperature and pressure conditions, making them versatile and adaptable to various CO2 capture scenarios.

As global concerns over CO2 emissions and climate change intensify, the search for effective and sustainable CO2 capture methods becomes increasingly crucial. Among the solid sorbents considered, activated carbon-based sorbents, exemplified by the Dotz Earth sorbent, stand out as an advantageous solution. Their abundant and renewable production process, tunable surface properties, high adsorption capacity, regenerability, and compatibility with diverse CO2 sources and capture conditions make them a promising and effective approach for large-scale CO2 capture. By harnessing the power of activated carbon, we can pave the way for a more sustainable future and combat the adverse effects of climate change.

Thank You!