Nano Archive

Evidence for the Role of Colloidal Palladium in the Catalytic Formation of H2O2 from H2 and O2

Dissanayake, Dhammike P. and Lunsford, Jack H. (2001) Evidence for the Role of Colloidal Palladium in the Catalytic Formation of H2O2 from H2 and O2. Journal of Catalysis, 206 (2). 173-176 .

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Abstract

The direct production of H2O2 from H2 and O2 (O2/H2=2) at 25°C and 760 Torr occurs in an aqueous phase over colloidal palladium that may be introduced either via PdCl2 or via Pd supported on silica gel (Pd/SiO2). In the latter case, aqueous HCl facilitates the dissolution of the supported Pd. The presence of colloidal palladium was confirmed by electron microscopy. When the solution was either 0.1 M or 1.0 M in HCl, removal of the silica, along with any remaining supported Pd, did not affect the rate of H2O2 formation because the amount of active colloidal Pd remained unchanged. The specific activity of the supported Pd is only 3% of that for colloidal Pd, probably because of transport limitations within the pores of the silica.

Item Type:Article
Subjects:Physical Science > Nanophysics
Physical Science > Nano objects
Material Science > Nanochemistry
Material Science > Nanostructured materials
Divisions:Faculty of Engineering, Science and Mathematics > School of Physics
Faculty of Engineering, Science and Mathematics > School of Chemistry
ID Code:7155
Deposited By:JNCASR
Deposited On:28 Oct 2009 05:21
Last Modified:28 Oct 2009 05:21

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