Controlled Preparation Of Magnetic Pd/Fe3O4 Spheres Via An Ethylenediamine-Assisted Route | Posted on:2012-12-05 | Degree:Master | Type:Thesis | Country:China | Candidate:H Q Wang | Full Text:PDF | GTID:2211330362959566 | Subject:Chemistry | Abstract/Summary: | PDF Full Text Request | A simple route based on time-dependent growth was employed to synthesize solid and hollow spheres of Pd/Fe3O4 nanocomposite. Transmission electron microscopic (TEM) imaging shows that the spheres are composed of nanocrystals with the solid spheres having a diameter of 533 nm whereas the hollow ones having a diameter of 520 nm and a shell thickness of 100 nm. An assembly-then-growth mechanism for the formation of the magnetic Pd/Fe3O4 nanocomposite has also been elucidated on the basis of the experimental observations. It is demonstrated that the Pd/Fe3O4 nanocomposite functions as heterogeneous catalysts for the hydrogenation reaction of p-nitrophenol at room temperature under atmospheric pressure. Both the solid and hollow spheres possess unique magnetic properties so that they may be conveniently separated and recovered by a magnet after the catalytic reaction. | Keywords/Search Tags: | palladium, solid spheres, hollow spheres, magnetic nanocomposite, hydrogenation catalysis | PDF Full Text Request | Related items |
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