Exploiting response surface methodology (RSM) as a novel approach for the optimization of carbon dioxide adsorption by dry sodium hydroxide

As a novel strategy involving dry NaOH sorbent for CO2capture from air is described. The influence of significant operating parameters, namely the temperature, pressure, and NaOH loading, on the CO2capture in a fixed‐bed reactor is experimentally explored using the response surface methodology (RSM). Accordingly, in this paper, RSM based on central composite design (CCD) is exploited to design experiments, build models, and determine the optimum conditions for desirable responses. The NaOH sorbent was then characterized by various approaches such as Fourier transform infrared spectroscopy and X‐ray diffraction analysis before and after the reactions. Besides, numerous isotherm models were applied to mathematically model the CO2adsorption, and on the basis of the regression coefficient (R2), the Frendlich model was found to deliver a perfect fit to the experimental data, based on the closeness of theR2‐value to unity. In addition to the experiments, the kinetic parameters were evaluated using a nonlinear least squares technique. The outcome achieved in this investigation can serve as a benchmark while searching for inexpensive and superior dry NaOH sorbent production in future studies.