Preparation of Al/Fe-PILC clay catalysts from concentrated precursors: enhanced hydrolysis of pillaring metals and intercalation

Vallejo, Carlos Andrés; Galeano, Luis Alejandro; Trujillano, Raquel; Vicente, Miguel Ángel; Gil Bravo, Antonio

Publication:
Preparation of Al/Fe-PILC clay catalysts from concentrated precursors: enhanced hydrolysis of pillaring metals and intercalation

dc.contributor.author	Vallejo, Carlos Andrés
dc.contributor.author	Galeano, Luis Alejandro
dc.contributor.author	Trujillano, Raquel
dc.contributor.author	Vicente, Miguel Ángel
dc.contributor.author	Gil Bravo, Antonio
dc.contributor.department	Institute for Advanced Materials and Mathematics - INAMAT2	en
dc.date.accessioned	2021-06-21T10:03:31Z
dc.date.available	2021-06-21T10:03:31Z
dc.date.issued	2020
dc.description.abstract	The modification of bentonite with Al-Fe species from different concentrated precursors at both stages: (i) the preparation of the (Al/Fe)-mixed pillaring solution and (ii) intercalation itself, was studied at lab scale. The final solids were characterized by X-ray fluorescence (XRF), X-ray diffraction (XRD), Cationic Exchange Capacity (CEC), textural analyses by nitrogen adsorption-desorption at 77 K, and hydrogen-temperature programmed reduction (H2-TPR). Finally, the modified clays were assessed as active materials in the Catalytic Wet Peroxide Oxidation (CWPO) of phenol under very mild conditions through 1.0 h of reaction: T = 25.0 °C ± 0.1 °C, pH = 3.7, ambient pressure (76 kPa), and 0.5 g catalyst per dm3. Metal hydrolysis by the dissolution of elemental aluminium (final Total Metal Concentration TMC = 4.62 mol dm-3) achieved the best results, decreasing the volume of solution per mass unit of clay required to successfully expand the layered starting mineral by a factor of close to 75, in comparison with the widespread conventional preparation using highly diluted Al-based pillaring solutions. Even in the absence of any solvent for the clay dispersion, the intercalating/pillaring method was shown to be favourable, as a novel strategy promoting the process intensification and subsequent preparation of Al/Fe- and other Al-based pillared clays at larger scales. The best catalyst prepared from concentrated precursors exhibited 79.1% phenol conversion, 19.3% TOC mineralization, and pretty low iron leaching (0.037 mg Fe dm-3; ∼0.12% w/w) in such a short catalytic assessment; all these results were quite comparable or even exceeded those exhibited by the catalyst prepared from dilute precursors. © 2020 The Royal Society of Chemistry.	en
dc.description.sponsorship	The financial support from CT&I Fund of the SGR-Colombia to CWPO for better drinking water quality project (BPIN 2014000100020), is kindly acknowledged. The Spanish authors are grateful for financial support from the Spanish Ministry of Economy, Industry and Competitiveness (AEI/MINECO), and the European Regional Development Fund (ERDF) through project MAT2016-78863-C2-R. AG also thanks Santander Bank for funding via the Research Intensification Program.	en
dc.format.extent	11 p.
dc.format.mimetype	application/pdf	en
dc.identifier.doi	10.1039/d0ra08948f
dc.identifier.issn	2046-2069
dc.identifier.uri	https://academica-e.unavarra.es/handle/2454/39998
dc.language.iso	eng	en
dc.publisher	Royal Society of Chemistry	en
dc.relation.ispartof	RSC Advances, 2020, 10, 40450–40460	en
dc.relation.projectID	info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/MAT2016-78863-C2-R	en
dc.relation.publisherversion	https://doi.org/10.1039/d0ra08948f
dc.rights	This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence.	en
dc.rights.accessRights	info:eu-repo/semantics/openAccess	en
dc.rights.accessRights	Acceso abierto / Sarbide irekia	es
dc.rights.uri	http://creativecommons.org/licenses/by-nc/4.0/
dc.subject	Pillared clays	en
dc.subject	Al/Fe PILCs	en
dc.title	Preparation of Al/Fe-PILC clay catalysts from concentrated precursors: enhanced hydrolysis of pillaring metals and intercalation	en
dc.type	info:eu-repo/semantics/article
dc.type.version	info:eu-repo/semantics/publishedVersion	en
dc.type.version	Versión publicada / Argitaratu den bertsioa	es
dspace.entity.type	Publication
relation.isAuthorOfPublication	cd12e590-cb42-47d5-a642-f60eeee624ec
relation.isAuthorOfPublication.latestForDiscovery	cd12e590-cb42-47d5-a642-f60eeee624ec