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Mehlhorn D, Rodriguez J, Cacciaguerra T, et al. Revelation on the Complex Nature of Mesoporous Hierarchical FAU-Y Zeolites. Langmuir. 2018;34(38):11414-11423doi: 10.1021/acs.langmuir.8b03010.
Mehlhorn, D., Rodriguez, J., Cacciaguerra, T., Andrei, R. D., Cammarano, C., Guenneau, F., Gedeon, A., Coasne, B., Thommes, M., Minoux, D., Aquino, C., Dath, J. P., Fajula, F., & Galarneau, A. (2018). Revelation on the Complex Nature of Mesoporous Hierarchical FAU-Y Zeolites. Langmuir : the ACS journal of surfaces and colloids, 34(38), 11414-11423. https://doi.org/10.1021/acs.langmuir.8b03010
Mehlhorn, Dirk, et al. "Revelation on the Complex Nature of Mesoporous Hierarchical FAU-Y Zeolites." Langmuir : the ACS journal of surfaces and colloids vol. 34,38 (2018): 11414-11423. doi: https://doi.org/10.1021/acs.langmuir.8b03010
Mehlhorn D, Rodriguez J, Cacciaguerra T, Andrei RD, Cammarano C, Guenneau F, Gedeon A, Coasne B, Thommes M, Minoux D, Aquino C, Dath JP, Fajula F, Galarneau A. Revelation on the Complex Nature of Mesoporous Hierarchical FAU-Y Zeolites. Langmuir. 2018 Sep 25;34(38):11414-11423. doi: 10.1021/acs.langmuir.8b03010. Epub 2018 Sep 14. PMID: 30188140.
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Langmuir. 2018 Sep 25;34(38):11414-11423. doi: 10.1021/acs.langmuir.8b03010. Epub 2018 Sep 14.

Revelation on the Complex Nature of Mesoporous Hierarchical FAU-Y Zeolites.

Langmuir : the ACS journal of surfaces and colloids

Dirk Mehlhorn, Jeremy Rodriguez, Thomas Cacciaguerra, Radu-Dorin Andrei, Claudia Cammarano, Flavien Guenneau, Antoine Gedeon, Benoit Coasne, Matthias Thommes, Delphine Minoux, Cindy Aquino, Jean-Pierre Dath, François Fajula, Anne Galarneau

Affiliations

  1. ICGM UMR 5253 CNRS-Univ Montpellier-ENSCM , ENSCM 240 Avenue Pr E. Jeanbrau , 34296 Montpellier Cedex 5, France.
  2. Laboratoire de Chimie de la Matière Condensée, LCMCP, Collège de France , Sorbonne Université, CNRS , F-75005 Paris , France.
  3. Laboratoire Interdisciplinaire de Physique (LIPhy) , CNRS and University Grenoble Alpes , 140 rue de la Physique, Domaine Universitaire, BP 87 , 38402 Saint Martin d'Heres Cedex, France.
  4. Quantachrome Instruments , 1900 Corporate Drive , Boynton Beach , Florida 33426 , United States.
  5. Total Research & Technology Feluy , 7181 Feluy , Belgium.

PMID: 30188140 DOI: 10.1021/acs.langmuir.8b03010

Abstract

The texture of mesoporous FAU-Y (FAUmes) prepared by surfactant-templating in basic media is a subject of debate. It is proposed that mesoporous FAU-Y consists of: (1) ordered mesoporous zeolite networks formed by a surfactant-assisted zeolite rearrangement process involving local dissolution and reconstruction of the crystalline framework, and (2) ordered mesoporous amorphous phases as Al-MCM-41, which coexist with zeolite nanodomains obtained by a dissolution-reassembly process. By the present systematic study, performed with FAU-Y (Si/Al = 15) in the presence of octadecyltrimethylammonium bromide and 0 < NaOH/Si ratio < 0.25 at 115 °C for 20 h, we demonstrate that mesoporous FAU zeolites consist, in fact, of a complex family of materials with textural features strongly impacted by the experimental conditions. Two main families have been disclosed: (1) for 0.0625 < NaOH/Si < 0.10, FAUmes are ordered mesoporous materials with zeolite walls, which coexist with zeolite nanodomains (100-200 nm) and (2) for 0.125 < NaOH/Si < 0.25, FAUmes are ordered mesoporous materials with amorphous walls as Al-MCM-41, which coexist with zeolite nanodomains (5-100 nm). The zeolite nanodomains decrease in size with the increase of NaOH/Si ratio. Increasing NaOH/Si ratio leads to an increase of mesopore volume, while the total surface area remains constant, and to a decrease of strong acidity in line with the decrease of micropore volume. The ordered mesoporous materials with zeolite walls feature the highest acidity strength. The ordered mesoporous materials with amorphous walls present additional large pores (50-200 nm), which increase in size and amount with the increase of NaOH/Si ratio. This alkaline treatment of FAU-Y represents a way to obtain ordered mesoporous materials with zeolite walls with high mesopore volume for NaOH/Si = 0.10 and a new way to synthesize mesoporous Al-MCM-41 materials containing extralarge pores (50-200 nm) ideal for optimal diffusion (NaOH/Si = 0.25).

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