Adsorptive separation studies of ethane-methane and methane-nitrogen systems using mesoporous carbon

Area of Science:

• Materials Science
• Chemical Engineering
• Environmental Science

Background:

• Adsorptive separation of ethane/methane and methane/nitrogen mixtures is crucial for energy and environmental sustainability.
• Developing efficient adsorbents is key to improving these separation processes.

Purpose of the Study:

• To synthesize and characterize a novel mesoporous carbon adsorbent.
• To evaluate its performance in adsorptive separations of C(2)H(6)/CH(4) and CH(4)/N(2) binary mixtures.

Main Methods:

• Synthesis of mesoporous carbon using a soft template method.
• Characterization via TEM, TGA, and nitrogen adsorption/desorption.
• Determination of adsorption equilibrium and kinetics at various temperatures and pressures.

Main Results:

• The mesoporous carbon exhibited high adsorption capacities for ethane (2.20 mmol/g) and methane (1.05 mmol/g) at 298 K and 100 kPa.
• Equilibrium selectivities for C(2)H(6)/CH(4) and CH(4)/N(2) were 19.6 and 5.8, respectively.
• Adsorption was reversible with modest isosteric heats, indicating easy regeneration.

Conclusions:

• The synthesized mesoporous carbon demonstrates superior performance compared to existing adsorbents.
• It is a promising alternative for efficient and regenerable adsorptive separation of C(2)H(6)/CH(4) and CH(4)/N(2) gas mixtures.