Kinetic and equilibrium study of the CO2 adsorption on activated carbon

    Machines. Technologies. Materials., Vol. 15 (2021), Issue 8, pg(s) 299-302

    The presented research are concerned with the modelling of isotherms and chemical kinetics of mass transport for the CO2 adsorption on activated carbon, taking place in the fluidized and fixed bed. To determine the nature of CO2 binding under low-pressure conditions, adsorption complex and thermodynamic effects occurring during the process, four isothermal models were used: Langmuir, Freundlich, Temkin and Halsey. The evaluation of the factors affecting the course and rate of CO2 binding was based on four kinetic models, i.e. pseudo-first-order (PFO), pseudo-second-order (PSO), intraparticle diffusion (IPD) and the Elovich model. The validation of mathematical models showed that the linearized Freundlich and Halsey isotherms models are best suited to empirical data. In the case of process kinetics, the analysis showed that the non-linearized pseudo-first-order model (PFO) proved to be unrivalled in fitting to experimental data. The comparison of two types of tested beds suggested faster kinetics for a fluidized bed, while a larger amount of CO2 at equilibrium was adsorbed by the fixed bed.


    Impact analysis of kinetics and dynamics of SO2 and NOx adsorption from flue gases on the geometry of the column with a fixed carbon bed

    Innovations, Vol. 9 (2021), Issue 4, pg(s) 167-170

    The purpose of this research paper is to analyse the impact of kinetics and dynamics of sulphur dioxide (IV) and nitric oxide (II) adsorption from the flue gases on the geometry of a column with a fixed carbon bed. Using the following kinetics equation: pseudo-first and pseudo-second-order, Webber-Morris and Elovich and dynamics Langmuir equation, essential operation parameters for activated carbon made from coconut shell modified by copper have been found. Comparison of two schemes (simultaneous adsorption of SO2 and NO after CO2 adsorption and simultaneous adsorption of SO2, NO and CO2) has been done to determine the adsorption’s time, efficiency and a breakthrough curve. Process scaling has been used to evaluate the chances of adsorption flue gas treatment implementation in industrial production. Bed height has been modelled considering the flow of fuel gases for ½ technical scale and flow of fuel gases for large combustion plants. Match factors values have pointed that the research is more accurate for NOx than SO2 adsorption regardless of the operation scenario. To reduce the height of one column, a battery of columns should be applied, e.g. for NO adsorption in one segment and SO2 adsorption in another segment.