Nanoparticles Nanoparticles as Catalysts in Chemical Reactions

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Nanoparticle PreparationChemical Methods• Chemical methods of attaching nnprtil nanoparticles to support materials are:• Co-precipitation• Deposition-precipitationprecipitation• Ion-exchange• Impregnation• Successive Reduction• Calcinations• Surface Capping• Microemulsions• Photochemistry• Chemical Vapor Deposition• Electrochemical Reduction• Etc• Chemical techniques are the oldest andhave been proven to be successful.Nanoparticles Synthesis, Stabillization, passivation and FunctionalizationRamanathan Nagarajan and T. Alan Hatton Aug 2008
Nanoparticle Preparation• Impregnation- a metal nanoparticle precursordissolved in a solvent.- added to a porous support so that athick slurry is formed.- The solvent is then removed and thesolid is recovered and tested.• Co-precipitation- the metal and its support precipitatefrom solution at the same time.- Using this method metal nanoparticlescan become imbedded diinto porousmaterials.• Precipitation-Deposition- the dissociation of the metal precursorfollowed by a change in pH toprecipitate the nanoparticles onto thesurface of a support.Chemical Methodshttp://www3.interscience.wiley.com/cgi-bin/fulltext/121637625/main.html,ftx_abs
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Page 26 and 27: New AdvancementsFuel CellsCarbon Na
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