How DOCC Works
A smarter way to capture CO2 - built for the real world of engines.
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The Problem
The Problem
Engine emissions are a blind spot in global decarbonization.
Internal combustion engines (ICEs) power critical infrastructure around the world—from drilling rigs and mining trucks to backup generators and locomotives. These engines emit over 1.5 gigatons of CO₂ annually across distributed, often remote locations.
Existing carbon capture systems were never built for these environments. Most require:
Large, centralized exhaust sources
Complex solvent systems
High energy loads and large footprints
DOCC changes that.
What is DOCC?
What is DOCC?
Oxyfire Combustion
Oxyfire Combustion
DOCC replaces ambient air with purified oxygen, eliminating nitrogen from combustion.
Reduces exhaust impurities (e.g., NOₓ).
EGR Loop
EGR Loop
An exhaust gas recirculation loop controls combustion temperature and oxygen/fuel ratio.
Increases exhaust CO₂ concentration to ~50%.
CO₂ Liquefaction
CO₂ Liquefaction
The system compresses and refrigerates CO₂ in the exhaust, forcing it to liquefy.
Condenses CO₂ like water condenses into rain.
Direct Oxyfire Carbon Capture (DOCC) is a breakthrough, bolt-on carbon capture technology for internal combustion engines.
It uses a unique combination of:
Oxyfuel combustion (oxygen instead of air)
Exhaust gas recirculation (EGR)
Cryogenic CO₂ liquefaction
This process captures 90%+ of CO₂ emissions directly at the engine exhaust, without the need for chemical scrubbing, giant towers, or fixed infrastructure.
The Science Behind It
The Science Behind It
The DOCC process exploits the physical properties of CO₂ to force it to liquefy, without chemical scrubbing. This trick requires combustion in an oxygen enhanced environment, with the combution temperature controlled with recirculated exhaust gas. The resulting combustion gas mixture has elevated CO₂ concentrations (from 30-70%). At these levels, physical CO₂ purification can be exploited which is not possible in air-oxidation scenarios.
The result? Pipeline-grade liquid CO₂, with no need for additional treatment.
The result? Pipeline-grade liquid CO₂, with no need for additional treatment.
What Makes DOCC Different?
What Makes DOCC Different?
Feature
Feature
Chemical Solvents
Power Requirements
Footprint
Emissions Target
Water Recovery
Traditional Capture
Traditional Capture
Required
High
Massive
Fixed plants
No
DOCC
DOCC
None
Low (1.7–2.3 GJ/ton)
Trailer-sized
Engines, anywhere
Yes (0.8 tons per CO₂ ton)
“It’s not just a bolt-on CO₂ capture system. It’s a CO₂ liquefier, a water generator, and a NOₓ reducer — all in one.”
“It’s not just a bolt-on CO₂ capture system. It’s a CO₂ liquefier, a water generator, and a NOₓ reducer — all in one.”
Deployment Flexibility
Deployment Flexibility
DOCC is modular and engine-compatible:
DOCC is modular and engine-compatible:
Works with diesel and natural gas engines
No permanent modification required
Can toggle between normal mode and capture mode
Skid-mounted and ready for field deployment
It’s designed for:
It’s designed for:
Remote mining sites
Oil & gas operations
Standalone power generators
Mobile or distributed assets
Performance Metrics
Performance Metrics
CO₂ Capture Rate: >90%
Exhaust CO₂ Concentration: Up to 70%
Energy Use: 1.7–2.3 GJ/ton CO₂
Water Production: 0.8 tons H₂O per ton CO₂ (natural gas)
System Size: Modular — trailer-sized for 5–30 TPD
Ready to decarbonize your engine fleet?
Ready to decarbonize your engine fleet?
We’re partnering with forward-thinking operators on commercial pilots.
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