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A Review and Comparison of Carbon Dioxide Capture Technologies

Abstract

With the increasing severity of global climate change, carbon dioxide (CO₂) capture technologies have gained growing attention as a critical approach to reducing greenhouse gas emissions. This paper explores various carbon dioxide capture technologies, including absorption, adsorption, membrane separation, and biological capture methods. It compares these technologies by analyzing their advantages, disadvantages, application scenarios, and future development trends. Through comprehensive evaluation, this study aims to provide references for selecting and applying appropriate CO₂ capture technologies.

1. Introduction

Global climate change has become one of the most significant challenges facing humanity. Scientific research indicates that carbon dioxide is one of the primary greenhouse gases responsible for global warming, and its increasing emissions directly affect climate system stability. Therefore, reducing carbon dioxide emissions has become a shared goal of governments and research institutions worldwide.

Carbon Capture Technology (CCT) is an effective emission reduction approach designed to capture CO₂ from industrial emission sources or directly from the atmosphere, followed by storage or utilization.

2. Overview of Carbon Dioxide Capture Technologies

Carbon dioxide capture technologies can be broadly classified into the following categories:

2.1 Absorption Method

The absorption method uses liquid absorbents to chemically react with CO₂ in gas streams, removing it from the mixture. Common absorbents include water-soluble amines (such as MEA and DEA) and carbonate solutions.

Advantages:

• High capture efficiency

• Suitable for industrial emission sources

• Mature and well-established technology

Disadvantages:

• High energy consumption for solvent regeneration

• Corrosive nature of some absorbents requiring specialized materials

• Periodic solvent replacement required

2.2 Adsorption Method

The adsorption method uses solid adsorbents (such as activated carbon, zeolites, and metal-organic frameworks) to separate CO₂ from gas streams.

Advantages:

• Lower energy consumption compared to absorption

• Simple operation

• Regenerable adsorbent materials

Disadvantages:

• Adsorbent regeneration can be complex

• Selectivity toward CO₂ may require improvement

• Performance degradation over multiple cycles

2.3 Membrane Separation Method

Membrane separation relies on selective permeability of membrane materials to separate CO₂ from other gases.

Advantages:

• High efficiency

• Lower energy consumption

• Continuous operation capability

• Compact system design

Disadvantages:

• Membrane durability and long-term stability challenges

• High manufacturing cost of advanced membrane materials

• Sensitivity to fouling or contamination

2.4 Biological Capture Method

Biological capture utilizes microorganisms or plants to absorb CO₂ through natural metabolic processes.

Advantages:

• Sustainable and environmentally friendly

• Potential conversion of CO₂ into biofuels or value-added chemicals

• Natural carbon cycling process

Disadvantages:

• Lower technology maturity

• Limited capture rate and scalability

• Currently limited commercial deployment

3. Comparison of Carbon Dioxide Capture Technologies

3.1 Absorption Method

3.1.1 Advantages

• High capture efficiency at relatively low CO₂ concentrations

• Well-established industrial experience

• Reliable large-scale implementation

3.1.2 Disadvantages

• Significant energy demand during solvent regeneration

• Equipment corrosion concerns

• Higher operational costs

3.2 Adsorption Method

3.2.1 Advantages

• Lower regeneration energy

• Simpler operational management

• Modular system scalability

3.2.2 Disadvantages

• Regeneration complexity for certain materials

• Limited selectivity for some adsorbents

• Possible co-adsorption of other gases

3.3 Membrane Separation Method

3.3.1 Advantages

• High selectivity and gas throughput

• Competitive operational energy consumption

• Suitable for continuous industrial use

3.3.2 Disadvantages

• Membrane material degradation over time

• High initial material cost

• Performance sensitivity to contaminants

3.4 Biological Capture Method

3.4.1 Advantages

• Environmentally sustainable

• Supports circular carbon utilization

• Potential for renewable fuel production

3.4.2 Disadvantages

• Early-stage commercialization

• Lower capture efficiency

• Limited industrial scalability

4. Application Scenarios of Different Technologies

4.1 Applications of Absorption

Absorption technology is widely used in industrial sectors such as:

• Coal-fired power plants

• Natural gas processing

• Cement production facilities

For example, many coal power plants globally use amine-based absorption systems to significantly reduce CO₂ emissions.

4.2 Applications of Adsorption

Adsorption methods are applied in:

• Natural gas purification

• Industrial gas separation

Research continues to explore advanced materials such as metal-organic frameworks (MOFs) to improve adsorption capacity and selectivity.

4.3 Applications of Membrane Separation

Membrane technologies are increasingly adopted in:

• Natural gas processing

• Industrial CO₂ separation systems

Many companies are developing high-performance membrane materials to enhance separation efficiency.

4.4 Applications of Biological Capture

Biological capture remains relatively limited but shows potential in:

• Agricultural carbon management

• Wastewater treatment

• Microalgae-based CO₂ utilization for biofuel production

5. Challenges and Future Prospects

5.1 Technical Challenges

• High energy consumption in some capture systems

• Limitations in material performance and stability

• Limited large-scale commercialization of emerging technologies

5.2 Policy Support

Government policy plays a crucial role in advancing carbon capture technology. Increased research funding and incentive mechanisms are necessary to accelerate commercialization and large-scale implementation.

5.3 Market Demand

As global emission reduction requirements intensify, demand for carbon capture technologies will continue to grow. Companies must proactively invest in research and development to meet market expectations.

5.4 Future Outlook

Future carbon capture technologies will evolve toward:

• Higher efficiency

• Lower energy consumption

• Greater sustainability

• Improved economic viability

With advancements in materials science and engineering innovation, capture performance and cost-effectiveness are expected to significantly improve.

6. Conclusion

Carbon dioxide capture technology plays a vital role in reducing greenhouse gas emissions and addressing climate change. This paper reviewed and compared major CO₂ capture technologies, analyzing their advantages, disadvantages, application scenarios, and development trends.

With continued technological progress and policy support, carbon capture technologies will play an increasingly important role in future environmental and industrial sustainability efforts.