Changes in Porous Parameters of the Ion Exchanged X Zeolite and Their Effect on CO2 Adsorption

被引:11
|
作者
Gesikiewicz-Puchalska, Andzelika [1 ]
Zgrzebnicki, Michal [1 ]
Michalkiewicz, Beata [1 ]
Kalamaga, Agnieszka [1 ]
Narkiewicz, Urszula [2 ]
Morawski, Antoni W. [2 ]
Wrobel, Rafal [1 ]
机构
[1] West Pomeranian Univ Technol, Fac Chem Technol & Engn, Dept Catalyt & Sorbent Mat Engn, Piastow Ave 42, PL-71065 Szczecin, Poland
[2] West Pomeranian Univ Technol, Fac Chem Technol & Engn, Dept Inorgan Chem Technol & Environm Engn, Piastow Ave 42, PL-71065 Szczecin, Poland
来源
MOLECULES | 2021年 / 26卷 / 24期
关键词
CO2; adsorption; selectivity; zeolite; 13X; ion exchange; CCS; CARBON-DIOXIDE; ACTIVATED CARBONS; POWER-PLANT; Y-ZEOLITES; CAPTURE; 13X; EQUILIBRIUM; SEPARATION; ADSORBENT; SORPTION;
D O I
10.3390/molecules26247520
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Zeolite 13X (NaX) was modified through ion-exchange with alkali and alkaline earth metal cations. The degree of ion exchange was thoroughly characterized with ICP, EDS and XRF methods. The new method of EDS data evaluation for zeolites was presented. It delivers the same reliable results as more complicated, expensive, time consuming and hazardous ICP approach. The highest adsorption capacities at 273 K and 0.95 bar were achieved for materials containing the alkali metals in the following order K < Na < Li, respectively, 4.54, 5.55 and 5.94 mmol/g. It was found that it is associated with the porous parameters of the ion-exchanged samples. The Li0.61Na0.39X form of zeolite exhibited the highest specific surface area of 624 m(2)/g and micropore volume of 0.35 cm(3)/g compared to sodium form 569 m(2)/g and 0.30 cm(3)/g, respectively. The increase of CO2 uptake is not related with deterioration of CO2 selectivity. At room temperature, the CO2 vs. N-2 selectivity remains at a very high stable level prior and after ion exchange in co-adsorption process (X-CO2 during adsorption 0.15; X-CO2 during desorption 0.95) within measurement uncertainty. Additionally, the Li0.61Na0.39X sample was proven to be stable in the aging adsorption-desorption tests (200 sorption-desorption cycles; circa 11 days of continuous process) exhibiting the CO2 uptake decrease of about 6%. The exchange with alkaline earth metals (Mg, Ca) led to a significant decrease of SSA and micropore volume which correlated with lower CO2 adsorption capacities. Interestingly, the divalent cations cause formation of mesopores, due to the relaxation of lattice strains.
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页数:19
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