Porosity of micro-mesoporous zeolites prepared via pseudomorphic transformation of zeolite Y crystals: A combined isothermal sorption and thermodesorption investigation - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Microporous and Mesoporous Materials Année : 2013

Porosity of micro-mesoporous zeolites prepared via pseudomorphic transformation of zeolite Y crystals: A combined isothermal sorption and thermodesorption investigation

Résumé

The porosity of micro-mesoporous zeolite crystals was studied by sorption measurements with different probe molecules. Recrystallization of a commercial zeolite Y with addition of a cationic surfactant as the mesostructure directing agent was used as a 'constructive' synthesis route to generate mesoporosity inside the zeolite crystals. The obtained material was characterized by X-ray powder diffraction, scanning and transmission electron microscopy and thermogravimetric analysis. The adsorption-desorption isotherms of N2 and Ar at 77 K and quasi-equilibrated temperature programmed desorption and adsorption (QE-TPDA) of n-hexane and n-nonane were performed in order to characterize the hierarchical porous network. The QE-TPDA of n-hexane on the recrystallized zeolite confirmed the faujasite type structure and showed some distortion of the micropores. The pore size distributions calculated from the QE-TPD of n-nonane are more precise than those determined from nitrogen desorption isotherms, since determined from numerous experimental data points recorded in one desorption cycle.

Dates et versions

hal-00870205 , version 1 (06-10-2013)

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Citer

Maria Manko, Robin Chal, Philippe Trens, Delphine Minoux, Corine Gerardin, et al.. Porosity of micro-mesoporous zeolites prepared via pseudomorphic transformation of zeolite Y crystals: A combined isothermal sorption and thermodesorption investigation. Microporous and Mesoporous Materials, 2013, 170, pp.243-250. ⟨10.1016/j.micromeso.2012.12.016⟩. ⟨hal-00870205⟩
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