CO₂ Capture With Absorbents of Tertiary Amine Functionalized Nano-SiO₂

Area of Science:

• Materials Science
• Chemical Engineering
• Environmental Science

Background:

• Improving CO2 adsorption is crucial for climate change mitigation.
• Nanoparticle absorbents offer potential for efficient CO2 capture.
• Existing absorbents face challenges in performance and application.

Purpose of the Study:

• To synthesize and characterize a novel tertiary amine functionalized nano-silica (NS-NR2) for enhanced CO2 adsorption.
• To investigate the CO2 capture mechanism and influencing factors of NS-NR2.
• To evaluate the potential of NS-NR2 in CO2 storage and enhanced oil recovery.

Main Methods:

• Synthesis of NS-NR2 via methylation of 3-aminopropyltrimethoxysilane (KH540) modified nano-silica (NS-NH2).
• Characterization of chemical structure and adsorption performance.
• Kinetic modeling (pseudo second order) to study CO2 capture mechanism.
• Investigation of influencing factors: temperature, dispersants, and cycling numbers.

Main Results:

• NS-NR2 exhibits effective CO2 reaction in water and nanofluids.
• Low viscosity nanofluids demonstrated superior CO2 capture.
• Pseudo second order kinetic model accurately described CO2 adsorption.
• Additional surfactants significantly enhanced adsorption due to improved nanoparticle dispersity.
• NS-NR2 showed high CO2 capacity, low viscosity, and good regenerability.

Conclusions:

• NS-NR2 is a promising material for efficient CO2 capture.
• The material's properties are favorable for applications in CO2 storage and enhanced oil recovery (EOR) via CO2 flooding.
• Optimized dispersity is key to maximizing NS-NR2 performance.