Pure and Binary Adsorption of Carbon Dioxide and Nitrogen on AQSOA FAM Z02

Abstract

Adsorption equilibria of CO2, N2, and the CO2/N2 binary system on AQSOA FAM Z02 grains were measured over a temperature range of 295 to 348 K and over a wide range in pressure from 0.2 to 20 bar using a gravimetric method. CO2 and N2 single-component experimental equilibrium measurements were regressed using the Toth equation. CO2 adsorption on AQSOA FAM Z02 reported higher loadings compared to N2 adsorption at all measured temperatures, with an adsorption capacity of 6.1 mmol g–1. The adsorption of the CO2/N2 binary mixture at different gas-phase compositions (0.15/0.85, 0.50/0.50, and 0.80/0.20 mole fractions) was studied. The experimental data were compared with the prediction of ideal adsorbed solution theory (IAST), which also included the nonidealities in the bulk gas phase. The IAST model has shown agreement with the experimental data with <4% average relative error in the absolute adsorbed amount.