Kinetics study of CO molecules adsorption on Al2O3/Zeolite composite films prepared by roll-coating method

CO gas adsorption has become a topic of great significance and worthy of investigation. The purpose of this study was to explore the CO adsorption of Al2O3/Zeolite composite films prepared by a roll coating method. XRD, FESEM, and EDX analyses have been used to study the structural, morphological, and elemental properties of Al2O3/Zeolite composite films. A gas analyzer was used to probe CO gas adsorption on the composite films at a constant temperature and pressure. The concentration of inlet CO gas and saturation level was 190 and 4 mg L-1, respectively. The maximum values of adsorption efficiency and uptake capacity were measured at 97.89% and 213.9 mg g(-1). To determine the kinetic study, three models were investigated: pseudo-first-order, pseudo-second-order, and intra-particle diffusion. The pseudo-second-order model was suitable for CO adsorption by Al2O3/Zeolite adsorbent. Additionally, the rate-controlling step for Al2O3/Zeolite adsorbent was identified through the intra-particle diffusion model.