Overview
- Carbon Capture and Utilisation refers to technologies that capture carbon dioxide (CO₂) emissions from industrial sources and convert them into useful products.
- It is part of broader climate mitigation strategies alongside renewable energy and energy efficiency.
- Unlike Carbon Capture and Storage (CCS), CCU focuses on reusing captured CO₂ rather than permanently storing it underground.
Why CCU is Needed
- Heavy industries such as cement, steel, chemicals and power generation emit large volumes of CO₂.
- Some sectors are difficult to decarbonise through electrification alone.
- CCU helps reduce net emissions while creating economic value from captured carbon.
How CCU Works
Carbon Capture
CO₂ is captured from:
- Industrial smokestacks
- Power plants
- Direct air capture systems
Capture methods include:
- Post-combustion capture
- Pre-combustion capture
- Oxy-fuel combustion
Carbon Utilisation
Captured CO₂ is converted into:
- Synthetic fuels
- Chemicals and polymers
- Building materials such as carbon-cured concrete
- Fertilisers
- Carbonated beverages
- Methanol and aviation fuel
Key Technologies
- Chemical absorption and adsorption systems
- Membrane separation technologies
- Biological conversion using algae or microbes
- Mineralisation processes for construction materials
Benefits
- Reduces greenhouse gas emissions from hard-to-abate sectors.
- Supports circular carbon economy.
- Encourages industrial innovation and green jobs.
- Enhances energy transition strategies.
Limitations and Challenges
- High capital and operational costs.
- Energy-intensive capture processes.
- Limited large-scale commercial viability.
- Risk of prolonging fossil fuel dependency if misused.
Difference Between CCU and CCS
CCU
- Captured carbon is reused in products.
- May eventually re-release CO₂ depending on product lifecycle.
CCS
- Captured carbon is stored permanently underground.
- Aims for long-term sequestration.
Global Relevance
- Considered important for achieving mid-century net-zero targets.
- Supported by climate frameworks in Europe, North America and Asia.
- Increasingly integrated with green hydrogen and synthetic fuel strategies.
Carbon Capture and Utilisation represents a transitional climate solution aimed at reducing emissions while fostering low-carbon industrial transformation.
