Enhancement of CO2 capture by using synthesized nano-zeolite

• Nano zeolite showed very high adsorption capacity for CO2 at ambient temperature.
• The selectivity of CO2 over N2 highly depended on temperatures.
• The original adsorption capacity of CO2 decreased only 6.33% after 10-cycle regeneration.
• The nano zeolite has good suitability and potential adsorbent for CO2 capture.

In this study synthesized nano-zeolite was evaluated for its potential use in CO2 capture via temperature swing adsorption. Adsorption equilibria of pure CO2 and mixtures containing 20% by volume CO2 and 80% by volume N2 were determined in a temperature range of 20–50 °C and at pressure 0.1–1.5 atm. The identified adsorption capacity of CO2 by nano-zeolite was 4.81 mmol/g at a temperature of 20 °C and at pressure of 1 atm. In addition, the identified selectivity of CO2/N2 onto nano-zeolite, calculated using ideal adsorbed solution theory (IAST), was 18.65 at 20 °C and 1 atm. From analysis of regeneration characteristics of CO2 loaded adsorbent, the percentage removal of CO2 was maintained at more than 88% even after 10 cycles of adsorption–desorption. Therefore, synthesized nano-zeolite with much improved CO2 adsorption capacity and a very high recyclability of CO2 loaded adsorbent can be used as an effective and economical adsorbent for CO2 capture.

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