Piperazine impregnation on Zeolite 13X as a novel adsorbent for CO2 capture: experimental and modeling

Abstract

Zeolite 13X was modified using a piperazine solution for CO2 adsorption purposes. The operating parameters including temperature, pressure, piperazine concentration, adsorbent amount, and particle size are investigated experimentally to examine adsorption capacity. The maximum adsorption capacity was obtained at temperature of 25°C, pressure of 8 bar, piperazine concentration 2 wt.%, adsorbent amount of 1 g, and particle size of 200 µm. The adsorption capacity for Zeolite 13X is increased from 193.844 to 242.084 mg g−1 after modification. The empirical isotherm data are more consistent with Freundlich model. The best adsorption kinetic model was Elovich model. The thermodynamic parameters represent the spontaneous and exothermic of the process.