TerraFixing's

DAC Technology

Lowest Cost, Patented, Proven, & Validated

At TerraFixing, we are distinctive in our strategy to capture, concentrate, and sequester CO2 with the aim of helping the world reach net zero and going beyond. We use a unique adsorption based process using readily available industrial materials, and by placing our process in desirable cold dry climates, we can achieve the lowest operating and capital costs in the DAC industry. The working material of our process are zeolites, which are cheap, robust, and effective at capturing CO2 from the air. These supermaterials with surface areas of over 800 m²/g work via adsorption whereby the CO2 is selectively captured on the surface. We employ these materials in a temperature vacuum swing adsorption cycle where CO2 is captured at environmental conditions and then released with temperature and a vacuum at high purities for sequestration. This process is simple, with only 5 unit operations, and operating energies as low as 1 MWh/tonCO2 in cold dry climates, we can achieve low capital costs and operating costs for DAC.

Simple process with readily available industrial materials

Our technology uses a 5-step temperature vacuum swing adsorption (TVSA) cycle that captures the CO2 from the air, purifies it, and releases high purity CO2. The working material, zeolite, is proven in industry for over 20 years for similar air prepurification separations. This zeolite is already produced in large quantities allowing us to scale to gigaton capture today. Our process is also simple reducing our CAPEX, we have only 5 unit operations to capture and concentrate the CO2 compared to competitors which have 9-22 unit operations.



TerraFixing's Fundamental DAC Technological Advantage



At TerraFixing, we have a technological advantage that will allow our technology to offer the lowest $/tonCO2 in the DAC space. Our technology uses adsorbents that physically adsorb the CO2 quickly, with very high CO2 loadings in cold climates. This combined with our simple process taking advantage of readily available industrial materials, allows for low CAPEX and OPEX.

Separation are thermodynamically more efficient in cold climates

This figure shows the minimum work required to capture and concentrate CO2 at a particular feed concentration in ppm. For air, that's 420ppm. The equation at the top, derived from the second law of thermodynamics, demonstrates that the temperature impacts the minimum work (Wmin) required to separate and concentrate CO2 to 100%. As the temperature decreases, Wmin decreases substantially. For example, the minimum work requirements are 45% lower at -50°C relative to 50°C. Therefore, a DAC plant operating in cold climates have a thermodynamical advantage over a process happening in a comfy warm climate. Adsorbent like TerraFixing's zeolites are able to operate in these cold climates, whereas amines and hydroxyl solutions physically cannot operate and take advantage of freezing conditions.

Zeolites are more ideal DAC materials: Higher CO2 capacity and lower CO2 heat of sorption

Looking at key metrics for a variety of sorbents where low CO2 heat of sorption and high CO2 sorption capacity at 420ppm are desired, operating our zeolites in cold climates are the most promising materials for DAC. Lower CO2 heat of sorption reduces the energy required to regenerate the sorbent. For instance, terrible materials like CaO that Heirloom uses, has a heat of sorption that requires 1.13 MWh/tonCO2 just to break the CO2-CaO bond. TerraFixing's zeolite requires just 0.28 MWh/tonCO2. This energy is also 2/5ths of that of Climeworks & Global Thermostat which uses amines (MEA & TRI-PE). TerraFixing's zeolite in cold conditions also adsorbs a significant amount more CO2 in cold to freezing conditions for the same mass of material. This translates into CAPEX saving but also energy savings that allows our technology to have the lowest DAC energy around 1 MWh/tonCO2 in favourable climates.

Zeolites are more ideal DAC materials: Faster rate constant and lower CO2 heat of sorption

Another key metric for a DAC process is the kinetics of how fast the CO2 reacts or uptakes into the sorbent which is known as CO2 rate constant. Slow kinetics require larger equipment and/or slower cycle times, and therefore increasing the CAPEX. Traditional DAC materials like (OH-) of Carbon Engineering, amines (MEA & DEA) of Climeworks either have a moderate sorption enthalpy or fast sorption rate. And companies using CaO like Heirloom have neither. TerraFixing's zeolite however, has both a fast sorption rate as well as moderate sorption enthalpy which fits into the ideal material zone. This ideal material zone was highlighted in 2011 by the DAC community in the APS report with committee members including Jennifer Wilcox, Peter Eisenberger (Global Thermostat), David Keith (Carbon Engineering), Klaus Lackner, and 30 other academics.


Ideal Location Advantage




Ideal Locations

At TerraFixing, we locate our DAC plant in cold dry climates like Canada, Norway, Alaska, Russia, Finland, Greenland, and Antarctica which have optimum conditions for our process. We also ensure that these DAC plants are located next to clean cheap abundant energy sources as well as a sequestration site to allow us to capture the CO2 for the lowest $/tonCO2. This formula will allow our technology to outcompete other DAC technologies and provide affordable DAC capture.

Unlimited Scalability

At TerraFixing, our technology has a scalability advantage with our modular unit and integration with renewable energy. The locations that we place our technology allow for unlimited scalability without NIMBYism and without effecting flora and fauna significantly.


Patented, Proven, & Validated


Patented

We have multiple patents of TerraFixing's DAC process protecting us against competitors.

Proven

Concept has been tested vigorously in the field showing the potential for sub 40$/tonCO2 capture.

Validated

Field prototype has been rigorously validated by multiple 3rd parties acknowledging the potential of TerraFixing's DAC technology.