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Effect of Water on CO2 Adsorption on CaNaY Zeolite: Formation of Ca2+(H2O)(CO2), Ca2+(H2O)(CO2)2 and Ca2+(H2O)2(CO2) Complexes.

ABSTRACT: Efficient CO2 capture materials must possess a high adsorption capacity, suitable CO2 adsorption enthalpy and resistance to water vapor. We have recently reported that Ca2+ cations exchanged in FAU zeolite can attach up to three CO2 molecules. Here we report the effect of water on the adsorption of CO2. Formation of Ca2+(H2O)(CO2), Ca2+(H2O)(CO2)2 and Ca2+(H2O)2(CO2) mixed ligand complexes were established. The Ca2+(H2O)(CO2) species are readily formed even at ambient temperature and are characterized by ν(12CO2) and ν(13CO2) infrared bands at 2358 and 2293 cm-1, respectively. The Ca2+(H2O)(CO2)2 species are produced at low temperature and are identified by a ν(13CO2) band at 2291 cm-1. In the presence of large amounts of water, Ca2+(H2O)2(CO2) complexes were also evidenced by ν(12CO2) and ν(13CO2) bands at 2348 and 2283 cm-1, respectively. The results demonstrate that, although it has a negative effect on CO2 adsorption uptake, water in moderate amounts does not block CO2 adsorption sites.

SUBMITTER: Drenchev NL 

PROVIDER: S-EPMC10458211 | biostudies-literature | 2023 Aug

REPOSITORIES: biostudies-literature

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Effect of Water on CO<sub>2</sub> Adsorption on CaNaY Zeolite: Formation of Ca<sup>2+</sup>(H<sub>2</sub>O)(CO<sub>2</sub>), Ca<sup>2+</sup>(H<sub>2</sub>O)(CO<sub>2</sub>)<sub>2</sub> and Ca<sup>2+</sup>(H<sub>2</sub>O)<sub>2</sub>(CO<sub>2</sub>) Complexes.

Drenchev Nikola L NL   Shivachev Boris L BL   Dimitrov Lubomir D LD   Hadjiivanov Konstantin I KI  

Nanomaterials (Basel, Switzerland) 20230808 16

Efficient CO<sub>2</sub> capture materials must possess a high adsorption capacity, suitable CO<sub>2</sub> adsorption enthalpy and resistance to water vapor. We have recently reported that Ca<sup>2+</sup> cations exchanged in FAU zeolite can attach up to three CO<sub>2</sub> molecules. Here we report the effect of water on the adsorption of CO<sub>2</sub>. Formation of Ca<sup>2+</sup>(H<sub>2</sub>O)(CO<sub>2</sub>), Ca<sup>2+</sup>(H<sub>2</sub>O)(CO<sub>2</sub>)<sub>2</sub> and Ca<sup>2+</sup  ...[more]

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