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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Autores principales: Anderson Parodia, Janaina A. Prasniski, Francine Bertella, Sibele B. C. Pergher
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Publicado: MDPI AG 2021
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spelling 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 DOAJ
collection DOAJ
language EN
topic pillared clays
Al-PILC
Keggin-Al<sub>13</sub> polycations
synthesis parameters
temperature
intercalation time
Mineralogy
QE351-399.2
spellingShingle 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
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