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Fig. 3


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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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