SUMMARY
Abstract: The primary objective of this study was to develop a unique sorption system to analyze adsorption of different gases on micro porous materials and nanotubes. In order to achieve this goal, a high pressure Quartz Crystal Microbalance (QCM) based adsorption apparatus for single-component gas was developed. QCM is highly responsive to addition or removal of small amount of mass adsorbed or deposited on the surface of the crystal; hence, it makes an ideal tool for the study of adsorption from gas phase. The setup was calibrated using Matrimid polyimide whose thermodynamic properties and adsorption parameters are known. The Matrimid was spin-coated onto 14 mm in diameter QCM, and sorption equilibrium data for CO2 gas at 25, 30, 48, and 52 ēC and partial pressure range between 0 to 4 bars were obtained. Comparing the experimental adsorption isotherm of Matrimide for CO2 gas with literature data shows reasonable agreement between the experimental and literature data. Subsequently, adsorption of CO2, N2, and CH4 gases on aluminosilicate nanotubes samples has been studied in the temperature range of 20° to 120° Celsius and pressure range of 0 to 8 bars. The experimental results yield the CO2 and N2 heat of adsorptions of -35.5 and -25.4 kJ/mol respectively.