Enormous CO2 Sorption Capacity of PDMS Rubbers near Condensation Pressure and at Low Temperatures

2023/05/11 by Mizuki Inoue, Edhuan Ismail, Sadaki Samitsu +2
#CO2 recovery #Flory-Huggins theory #PDMS #carbon dioxide #gas adsorption #gas separation #sorption enthalpy

paper · doi:10.48505/nims.3958

Abstract

We report for the first time that PDMS rubber sorbs an extremely large amount of CO2 (792 mg g−1) at near the condensation pressure at a certain low temperature (−3 °C), giving the sorption enthalpy of 9.3–10.8 kJ mol−1. The sorption isotherms were evaluated by means of the Flory–Huggins equation, and the resultant χ parameters (1.3–0.2) were used to estimate the solubility parameter (SP). The CO2/CH4 and CO2/N2 selectivities were 9.6–44 at 100–3000 kPa and were far larger than those of activated carbon.

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