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Metallic cobalt clusters are synthesized inside the cages of NaY zeolite by a method including four steps, i.e.: (1) ion exchange, (2) precipitation of exchanged cobalt cations, (3) calcination and (4) reduction of the calcined oxide nano-particles inside the zeolite. As compared with that prepared by the ion exchange followed directly by calcination and reduction and that by the conventional impregnation...
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