Synthesis of binderless FAU-X (13X) monoliths with hierarchical porosity - Archive ouverte HAL
Article Dans Une Revue Microporous and Mesoporous Materials Année : 2019

Synthesis of binderless FAU-X (13X) monoliths with hierarchical porosity

Didier Cot
M-P. Belleville

Résumé

elf-standing binderless FAU-X monoliths with hierarchical trimodal porosity have been synthesized for the first time by a double pseudomorphic transformation. Parent silica monoliths obtained by the combination of spinodal decomposition and sol-gel process have first been synthesized. The silica monoliths have been then transformed into silica-alumina monoliths (0.25 < Al/Si < 0.40) in low NaOH concentration ([NaOH] = 0.24 mol/L) at 40 °C for 24 h. Silica-alumina monoliths have been then transformed into FAU-X monoliths featuring nanocrystals in the struts at high NaOH concentration ([NaOH] = 2.2 mol/L) with an aging step at 40 °C for 4 days and a crystallization step at 100 °C for 24 h. The FAU-X monoliths feature macropores with diameters adjustable from 3 to 20 μm (similar to the parent silica monolith). The skeleton of the FAU-X monoliths is formed by an aggregation of two populations of FAU-X nanocrystals (100–200 nm/400–500 nm) generating a secondary porosity between the nanocrystals of 30–1000 nm in diameter, centered at 300 nm. The FAU-X monoliths present three levels of porosity with a macropore volume of ca. 1.0 mL/g, a secondary pore volume of ca. 0.40 mL/g and a micropore volume of 0.30 mL/g. These new FAU-X monoliths with hierarchical porous structure fulfill the requirements of high performance adsorbents for continuous flow process intensification.
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Dates et versions

hal-02064129 , version 1 (25-11-2020)

Identifiants

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Youcef Didi, Bilel Said, Thomas Cacciaguerra, Khac Long Nguyen, Véronique Wernert, et al.. Synthesis of binderless FAU-X (13X) monoliths with hierarchical porosity. Microporous and Mesoporous Materials, 2019, 281, pp.57-65. ⟨10.1016/j.micromeso.2019.03.003⟩. ⟨hal-02064129⟩
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