Energetics of alkali and alkaline earth ion-exchanged zeolite A
Abstract
Alkali and alkaline earth ion-exchanged zeolite A samples were synthesized in aqueous exchange media. They were thoroughly studied by powder X-ray diffraction (XRD), electron microprobe (EMPA), thermogravimetric analysis and differential scanning calorimetry (TG-DSC), and high temperature oxide melt solution calorimetry. The hydration energetics and enthalpies of formation of these zeolite A materials from constituent oxides were determined. Specifically, the hydration level of zeolite A has a linear dependence on the average ionic potential (Z/r) of the cation, from 0.894 (Rb-A) to 1.317 per TO2 (Mg-A). The formation enthalpies from oxides (25 °C) range from –93.71 ± 1.77 (K-A) to –48.02 ± 1.85 kJ/mol per TO2 (Li-A) for hydrated alkali ion-exchanged zeolite A, and from –47.99 ± 1.20 (Ba-A) to –26.41 ± 1.71 kJ/mol per TO2 (Mg-A) for hydrated alkaline earth ion-exchanged zeolite A. As a result, the formation enthalpy from oxides generally becomes less exothermic as Z/r increases, but a distinct difference in slope is observed between the alkali and the alkaline earth series.
- Authors:
-
- East China Univ. of Science and Technology, Shanghai (China); Univ. of California, Davis, CA (United States)
- Univ. of California, Davis, CA (United States); Washington State Univ., Pullman, WA (United States)
- East China Univ. of Science and Technology, Shanghai (China)
- Univ. of California, Davis, CA (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Univ. of California, Davis, CA (United States)
- Publication Date:
- Research Org.:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1324571
- Report Number(s):
- LA-UR-16-23501
Journal ID: ISSN 1932-7447
- Grant/Contract Number:
- AC52-06NA25396
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Physical Chemistry. C
- Additional Journal Information:
- Journal Volume: 120; Journal Issue: 28; Journal ID: ISSN 1932-7447
- Publisher:
- American Chemical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Inorganic and Physical Chemistry
Citation Formats
Sun, Hui, Wu, Di, Liu, Kefeng, Guo, Xiaofeng, and Navrotsky, Alexandra. Energetics of alkali and alkaline earth ion-exchanged zeolite A. United States: N. p., 2016.
Web. doi:10.1021/acs.jpcc.6b04840.
Sun, Hui, Wu, Di, Liu, Kefeng, Guo, Xiaofeng, & Navrotsky, Alexandra. Energetics of alkali and alkaline earth ion-exchanged zeolite A. United States. https://doi.org/10.1021/acs.jpcc.6b04840
Sun, Hui, Wu, Di, Liu, Kefeng, Guo, Xiaofeng, and Navrotsky, Alexandra. Thu .
"Energetics of alkali and alkaline earth ion-exchanged zeolite A". United States. https://doi.org/10.1021/acs.jpcc.6b04840. https://www.osti.gov/servlets/purl/1324571.
@article{osti_1324571,
title = {Energetics of alkali and alkaline earth ion-exchanged zeolite A},
author = {Sun, Hui and Wu, Di and Liu, Kefeng and Guo, Xiaofeng and Navrotsky, Alexandra},
abstractNote = {Alkali and alkaline earth ion-exchanged zeolite A samples were synthesized in aqueous exchange media. They were thoroughly studied by powder X-ray diffraction (XRD), electron microprobe (EMPA), thermogravimetric analysis and differential scanning calorimetry (TG-DSC), and high temperature oxide melt solution calorimetry. The hydration energetics and enthalpies of formation of these zeolite A materials from constituent oxides were determined. Specifically, the hydration level of zeolite A has a linear dependence on the average ionic potential (Z/r) of the cation, from 0.894 (Rb-A) to 1.317 per TO2 (Mg-A). The formation enthalpies from oxides (25 °C) range from –93.71 ± 1.77 (K-A) to –48.02 ± 1.85 kJ/mol per TO2 (Li-A) for hydrated alkali ion-exchanged zeolite A, and from –47.99 ± 1.20 (Ba-A) to –26.41 ± 1.71 kJ/mol per TO2 (Mg-A) for hydrated alkaline earth ion-exchanged zeolite A. As a result, the formation enthalpy from oxides generally becomes less exothermic as Z/r increases, but a distinct difference in slope is observed between the alkali and the alkaline earth series.},
doi = {10.1021/acs.jpcc.6b04840},
journal = {Journal of Physical Chemistry. C},
number = 28,
volume = 120,
place = {United States},
year = {2016},
month = {6}
}
Web of Science
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