All issues Volume 74 (2019) Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles, 74 (2019) 38 Full HTML
SEM pictures (after metallization) of (a) the parent NaY zeolite and (b) the corresponding hollow crystals. (c) TEM picture of a sliced hollow crystal (70 nm thick) showing the mesoporous corona and (d, e) SEM pictures of hollow crystals using a high voltage of 20 kV (Sect. 2.2 for experimental details).
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