Kinetic study and modeling of the high temperature CO2 capture by Na2ZrO3 solid absorbent

Recent advances in solid sorbents for CO2capture and new development trends

“…In addition to the synthesis work, some kinetic studies and modeling have also been performed to obtain a clearer understanding to the CO 2 sorption and desorption processes. Jiménez et al 451 investigated the CO 2 sorption kinetics parameters including the reaction order, rate constant, apparent, intrinsic and diffusional activation energies on Na 2 ZrO 3 . A global reaction rate of rst order in CO 2 and a strong dependence on temperature were found.…”

Lithium orthosilicate for CO2 capture with high regeneration capacity: Kinetic study and modeling of carbonation and decarbonation reactions

“…Surface area analysis of the raw Li 4 SiO 4 generated an adsorption-desorption isotherm of type II ( [ 24,30,34,35]. The low surface area depending on particle size can be a limiting factor to the carbonation reaction, since the CO 2 has no access to the entire active area of the solid, thus requiring the diffusion of gas through the product layer [21].…”

“…According to the kinetic results, it is reasonable to assume that the initial linear fraction of the curves corresponds to the carbonation reaction. Thus, the overall reaction rates for each temperature were estimated by the linear curve slope DX=Dt, at times close to zero, according to the methodology presented by Jiménez and others [30]. The kinetic expression for the carbon dioxide consumption rate is given by,…”

“…In this case, limitations by the external diffusion in the gas layer and chemical reaction were excluded. Jimenez and others [30], on the contrary, proposed the fitting of the shrinking core model considering the three rate-limiting steps to the carbonation reaction of Na 2 ZrO 3 . Ortiz and others [24] applied the same methodology as Jimenez and others [30] to the experimental data of lithium orthosilicate carbonation.…”

The Role of Alkaline/alkaline Earth Metal Oxides in CO2 Capture: A Concise Review

“…It was also concluded that sodium diffusion was the rate limiting step for the process. Jimenez et al [93] suggested that the rate limiting step for the CO 2 sorption kinetics of Na 2 ZrO 3 at a similar temperature and partial pressure of 0.4-0.8atm was the surface reaction. Further studies have also revealed that the presence of steam favours the kinetics of the reaction and regeneration because steam increases the mobility of alkaline ions and therefore accelerates the reactions.…”