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

CO2 adsorption on PEHA-functionalized geothermal silica waste: a kinetic study and quantum chemistry approach

“…4,55 The Elovich model is convenient to describe systems with heterogeneous adsorption surfaces, such as the adsorption of gases on solids, where a uniform surface is not available, and its active sites are not constant throughout the CO 2 adsorption. 9,64 These results are explained as the SiO 2 used to prepare the SiO 2 -PEHA adsorbent was a waste material with a low specific surface area (13.46 m 2 g −1 ) and poor porosity; the CO 2 adsorption process controlled by diffusion is not appropriate. However, the chemical reaction between CO 2 and PEHA molecules is more convenient for explaining the CO 2 adsorption.…”

“…7 AM adsorbents were developed to enhance the basic character of solid adsorbents and correct the defects of the amine solutions. 8,9 Although they possess the advantages of the latter, AM adsorbents are accessible and can reduce the energy required for regeneration while increasing the adsorption capacity and CO 2 selectivity. 10 In addition, they minimize corrosion problems and environmental pollution.…”

“…Monoethanolamine (MEA), polyethyleneimine (PEI), tetraethylenepentamine (TEPA), diethylenetriamine (DETA), triethylenetetramine (TETA), and pentaethylenehexamine (PEHA) are the typical amines used for the CO 2 capture process. 2,5,9,11,13,22 Among them, given their high stability and nitrogen content, PEI, TEPA, and recently PEHA are the most widely used amine species (Table 1). 2 Wei et al reported the preparation of SBA-15 with a loading of 50 wt% of PEHA, which showed a capture capacity of 154 mg CO2 g −1 at 80 °C.…”

Comparison of hydroxide‐based adsorbents of Mg(OH)2 and Ca(OH)2 for CO2 capture: utilization of response surface methodology, kinetic, and isotherm modeling

“…The adsorption process is also an efficient method in the CO 2 capture purposes due to its high CO 2 adsorption capacity, high selectivity, low equipment cost, and low energy requirement at the atmospheric condition 13 . Various adsorbents such as carbonaceous materials, dry alkali metal‐based sorbents, zeolites, metal‐organic frameworks, and microporous organic polymers have been studied in the CO 2 adsorption process 14–17 . Recently, the metal hydroxide adsorbents have received many considerations in the industrial and academic domains due to the increase in the adsorption capacity, lower energy requirement for regeneration, several regenerations without any significant variation in the adsorption percentage, and low‐cost property 18–20 …”

Mass Transfer Flux of CO2 into Methyldiethanolamine Solution in a Reactive‐Absorption Process

“…Carbon dioxide (CO 2 ) has the largest fraction of 78.1 % of the total greenhouse gas emissions [1,2]. Removal of CO 2 from gas mixtures was performed to prevent greenhouse gas emissions.…”