CO 2 adsorption in amine-grafted zeolite 13X

Adsorption equilibrium of carbon dioxide on ammonia-modified activated carbon

“…The partial irreversibility observed in the isotherms of the modified sample may partly be a consequence of an irreversible reaction between CO 2 and nitrogen functionalities present on the carbon surfaces after modification. The observed increase in the desorption branch of the isotherms can also be attributed to diffusion resistance of CO 2 caused by the pore blocking with nitrogen surface groups that hinders the achievement of a strict equilibrium in the adsorption branch (Calleja et al, 2011;Olea et al, 2013;Bezerra 2014). The trend seen in the adsorption/desorption isotherms of the modified sample is consistent with previous observations where it was shown that the contribution of chemisorption to the total CO 2 uptake is more pronounced at low CO 2 partial pressures and/or high-temperature adsorption.…”

Evaluation of porous clay heterostructures modified with amine species as adsorbent for the CO2 capture

“…However, this technique displays several drawbacks related to the high energy consumption required for their regeneration and the high evaporation of the amine species due to their low thermal stability, which causes corrosion of equipment and the loss of effectiveness along the time [3,4]. In the last decade, the use of porous materials, such as zeolites [5][6][7], carbons [8,9], metal organic frameworks (MOF) [10,11], metal oxides [12,13], layered double hydroxides (LDH) [14,15] or porous silicas [4,[16][17][18][19] have shown to be an alternative to the aqueous alkylamine solutions for the selective CO 2 capture. These materials can be used as molecular sieves with narrow pore size, which favors the specific solid-gas interactions.…”

Functionalization of Metal–Organic Frameworks for Enhanced Stability under Humid Carbon Dioxide Capture Conditions

“…[9,[18][19][20] The integrationo fa mine-containing moieties, such as ethylenediamine (ED) or polyethyleneimine, onto porous inorganic materials such as zeolitesa nd mesoporouss ilica is aw ellknownt echnique to prepares upported amine chemisorbents. [21][22][23][24][25][26][27][28][29][30] These supported amine adsorbents are classified into class 1, 2, and 3a dsorbents according to the characteristics of the interactions between the inorganic support and the amines. [5] Among these,c lass 2a dsorbents comprise amine groupsb ound chemically to the surface functional groups of the support such as surfaces ilanols in zeolites or mesoporous silica.…”