https://doi.org/10.1088/1468-6996/9/1/013007
“Brandani and Ruthven [63] have observed that small amounts of water can inhibited the CO2 adsorption on diverse cationic forms of zeolites X (NaLSX, LiLSX, CaX), notably for zeolites NaLSX at 35 and 70 ∘C. According to these authors, this can be due to a reduction of the strength and heterogeneity of the zeolites electric field caused by a high adsorption capacity of water on the exchangeable cations generated by its strong polarity. The presence of water during the CO2 adsorption on the zeolites surface seems also to favor the formation of bicarbonates species via hydroxyl group formation [27]. The bicarbonates causes an increase of the CO2 desorption temperature. As it is shown by Siriwardane et al [27], a strongly bound CO2 in bicarbonates or bidentate carbonate type species formed on a natural herschelite-sodium chabazite and two forms of clinoptilolites was desorbed at 115 °C, while the majority of the physically adsorbed CO2 was desorbed at room temperature.”