Thermodynamic and kinetic studies on CO2 capture with Poly[VBTMA][Arg]

• Published in: The Journal of physics and chemistry of solids 2018-05, Vol.116, p.22-29
• Main Authors: Raja Shahrom, Maisara Shahrom, Wilfred, Cecilia Devi, Chong, Fai Kait
• Format: Article
• Language: English
• Subjects: Adsorption isotherm; CO2 sorption; Kinetic; Thermodynamic
• ISSN: 0022-3697; 1879-2553
• DOI: 10.1016/j.jpcs.2018.01.008

This paper discusses the technologies for capturing CO2 from the natural gas using poly[VBTMA][Arg], a type of poly(ionic liquids) with an amino acid as the anion. The results revealed that the CO2 uptake increased from 3.23 mmol/g to 7.91 mmol/g at 1–10 bar, 298 K due to both chemical absorption and physical adsorption increments. Four adsorption isotherm models were applied to study the interaction between adsorbate and adsorbent to study the physical adsorption i.e. Freundlich, Langmuir, Dubinin Raduschkevich and Temkin isotherms at 298 K, 313 K and 333 K. Promising results were obtained that suggested the Freundlich model and the pseudo-first order model are well fitted with the kinetic data at 298 K with a 0.9943 R2 value. This study has provided empirical evidence to the current body of knowledge pertaining to CO2 capture technologies. •Poly[VBTMA][Arg] is able to capture CO2 at ambient and higher pressures.•The CO2 capacity increases at higher pressure and decreases at higher temperature.•Poly[VBTMA][Arg] follows the Freundlich isotherm, implying the heterogeneous and multilayer formation, and it does not restrict to a monolayer as proposed in the Langmuir type.•Thermodynamic analysis proves it is spontaneous and the exothermic reaction with ΔH is −30.3 kJ/mol.