Analyses of Adsorption Behavior of CO₂, CH₄, and N₂ on Different Types of BETA Zeolites

Abstract

The adsorption equilibrium and kinetics of CO 2 , CH 4 , and N 2 on three types of BETA zeolites were investigated at different temperatures and a defined partial pressure range from dynamic breakthrough experiments. The adsorbed amount followed the decreasing order of CO 2 > CH 4 > N 2 for all studied materials. For the same ratio of SiO 2 /Al 2 O 3 , the Na-BETA-25 zeolite showed a higher uptake capacity than H-BETA-25, due to the presence of a Na + cationic center. Comparing the same H + compensation cation, zeolite H-BETA-25 expressed a slightly higher adsorption capacity than H-BETA-150. Regarding the selectivity of gases, based on their affinity constants, H-BETA-150 displayed the best ability. The adsorption kinetics was considered using the zero-length-column (ZLC) technique. Response surface methodology (RSM) was applied to evaluate the interactions between adsorption parameters and to describe the process.

Theoretical studies on carbon dioxide adsorption in cation-exchanged molecular sieves

“…Furthermore, the gas-solid interaction energy can be tuned by changing the metal cation, [6][7][8] cation concentration, [9][10][11] or the size or topology of the zeolite micropores. 12,13 The adsorption of CO 2 in alkali ion-exchanged zeolites has been extensively investigated experimentally and by computational methods. [6][7][8][9][10][11][12][13][14][15][16][17][18] It was found that the cation-CO 2 geometry is related to the nature of alkali cations on the Y zeolite, where the adsorption enthalpies show a decrease from Li + to Cs 7+ .…”

Compost from Municipal Solid Wastes as a Source of Biochar for CO2 Capture

“…The adsorption of CO 2 on the newly developed adsorbents CMSW-S-800 and CMSW-800-S was assessed in the temperature range of 40-100°C by applying the CCD as a design mod-el to the experimental runs [31][32][33]. The experimental values of input variables and their coded values, and also the response surfaces for CMSW-800-S and CMSW-S-800 samples are listed in Tab The obtained experimental values were fitted with quadratic models to develop the general correlations for the uptake capacity and the breakthrough time of the specified samples.…”

Novel Insights into Activated Carbon Derived from Municipal Solid Waste for CO2 Uptake: Synthesis, Adsorption Isotherms and Scale-up

“…In the last step, desorption process was performed by passing pure helium through the fixed bed. More details about the unit can be found elsewhere [4,10].…”

“…Currently, various classes of adsorbents including carbons based materials [4,7,8], zeolite molecular sieves [9,10], metal organic frameworks [11,12], meso-porous silicons [13,14] and other ones [15,16] have been extensively investigated for separation processes, energy conversion, and catalysis. Among different developed materials, activated carbons (ACs) are highly favorable adsorbents for CO 2 adsorption for several reasons [17].…”