Keggin-Al<sub>13</sub> Polycations: Influence of Synthesis and Intercalation Parameters on the Structural Properties of Al-Pillared Clays
Pillared clays are interesting materials with applications in catalysis and adsorption processes. To obtain these materials, several preparation procedures are necessary and must be optimized to tune the final properties of the resulting pillared clay. Therefore, this article reports the influence o...
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oai:doaj.org-article:bd060bb926e640b296ddf8159277483b2021-11-25T18:26:19ZKeggin-Al<sub>13</sub> Polycations: Influence of Synthesis and Intercalation Parameters on the Structural Properties of Al-Pillared Clays10.3390/min111112112075-163Xhttps://doaj.org/article/bd060bb926e640b296ddf8159277483b2021-10-01T00:00:00Zhttps://www.mdpi.com/2075-163X/11/11/1211https://doaj.org/toc/2075-163XPillared clays are interesting materials with applications in catalysis and adsorption processes. To obtain these materials, several preparation procedures are necessary and must be optimized to tune the final properties of the resulting pillared clay. Therefore, this article reports the influence of synthesis parameters (temperature and concentration) of Keggin-Al<sub>13</sub> polycations and different intercalation times (0.5 up to 72 h) on the structural properties of Al-pillared clays. The natural clays are from Brazil, and they are composed mainly of montmorillonite. By XRD, N<sub>2</sub> sorption, XRF and <sup>27</sup>Al NMR results of the Al-PILCs, we verified that the pillaring solution could be prepared at room temperature with an aging time of 24 h. For the cation exchange process, a period of at least 2 h is necessary to ensure the formation of pillared materials. The concentration of the Keggin-Al<sub>13</sub> polycations was evaluated by using diluted pillaring solutions followed by applying re-pillaring procedures. After submitting the pillared clay to another pillaring process, the number of pillars in the interlamellar space increased; however, the micropore volume decreased concomitantly. Thus, by optimizing the synthesis conditions of the Keggin-Al<sub>13</sub> polycations, Al-PILCs could be obtained with good values of basal spacing and specific surface area.Anderson ParodiaJanaina A. PrasniskiFrancine BertellaSibele B. C. PergherMDPI AGarticlepillared claysAl-PILCKeggin-Al<sub>13</sub> polycationssynthesis parameterstemperatureintercalation timeMineralogyQE351-399.2ENMinerals, Vol 11, Iss 1211, p 1211 (2021) |
institution |
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collection |
DOAJ |
language |
EN |
topic |
pillared clays Al-PILC Keggin-Al<sub>13</sub> polycations synthesis parameters temperature intercalation time Mineralogy QE351-399.2 |
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pillared clays Al-PILC Keggin-Al<sub>13</sub> polycations synthesis parameters temperature intercalation time Mineralogy QE351-399.2 Anderson Parodia Janaina A. Prasniski Francine Bertella Sibele B. C. Pergher Keggin-Al<sub>13</sub> Polycations: Influence of Synthesis and Intercalation Parameters on the Structural Properties of Al-Pillared Clays |
description |
Pillared clays are interesting materials with applications in catalysis and adsorption processes. To obtain these materials, several preparation procedures are necessary and must be optimized to tune the final properties of the resulting pillared clay. Therefore, this article reports the influence of synthesis parameters (temperature and concentration) of Keggin-Al<sub>13</sub> polycations and different intercalation times (0.5 up to 72 h) on the structural properties of Al-pillared clays. The natural clays are from Brazil, and they are composed mainly of montmorillonite. By XRD, N<sub>2</sub> sorption, XRF and <sup>27</sup>Al NMR results of the Al-PILCs, we verified that the pillaring solution could be prepared at room temperature with an aging time of 24 h. For the cation exchange process, a period of at least 2 h is necessary to ensure the formation of pillared materials. The concentration of the Keggin-Al<sub>13</sub> polycations was evaluated by using diluted pillaring solutions followed by applying re-pillaring procedures. After submitting the pillared clay to another pillaring process, the number of pillars in the interlamellar space increased; however, the micropore volume decreased concomitantly. Thus, by optimizing the synthesis conditions of the Keggin-Al<sub>13</sub> polycations, Al-PILCs could be obtained with good values of basal spacing and specific surface area. |
format |
article |
author |
Anderson Parodia Janaina A. Prasniski Francine Bertella Sibele B. C. Pergher |
author_facet |
Anderson Parodia Janaina A. Prasniski Francine Bertella Sibele B. C. Pergher |
author_sort |
Anderson Parodia |
title |
Keggin-Al<sub>13</sub> Polycations: Influence of Synthesis and Intercalation Parameters on the Structural Properties of Al-Pillared Clays |
title_short |
Keggin-Al<sub>13</sub> Polycations: Influence of Synthesis and Intercalation Parameters on the Structural Properties of Al-Pillared Clays |
title_full |
Keggin-Al<sub>13</sub> Polycations: Influence of Synthesis and Intercalation Parameters on the Structural Properties of Al-Pillared Clays |
title_fullStr |
Keggin-Al<sub>13</sub> Polycations: Influence of Synthesis and Intercalation Parameters on the Structural Properties of Al-Pillared Clays |
title_full_unstemmed |
Keggin-Al<sub>13</sub> Polycations: Influence of Synthesis and Intercalation Parameters on the Structural Properties of Al-Pillared Clays |
title_sort |
keggin-al<sub>13</sub> polycations: influence of synthesis and intercalation parameters on the structural properties of al-pillared clays |
publisher |
MDPI AG |
publishDate |
2021 |
url |
https://doaj.org/article/bd060bb926e640b296ddf8159277483b |
work_keys_str_mv |
AT andersonparodia kegginalsub13subpolycationsinfluenceofsynthesisandintercalationparametersonthestructuralpropertiesofalpillaredclays AT janainaaprasniski kegginalsub13subpolycationsinfluenceofsynthesisandintercalationparametersonthestructuralpropertiesofalpillaredclays AT francinebertella kegginalsub13subpolycationsinfluenceofsynthesisandintercalationparametersonthestructuralpropertiesofalpillaredclays AT sibelebcpergher kegginalsub13subpolycationsinfluenceofsynthesisandintercalationparametersonthestructuralpropertiesofalpillaredclays |
_version_ |
1718411154830655488 |