Shaped palladium nanoparticles (PdNPs) have the potential to be selective catalysts. Unfortunately, their size can limit their use in heterogeneous catalysis because they are difficult to remove from solution after a reaction. Attaching nanoparticles to a support addresses this issue. However, composite formation is typically a two-step process, and the time and energy involved circumvents the energy saving goals of catalysis. Additionally, current shaped nanoparticle syntheses usually occur at high temperatures, which is also counterproductive. We have developed a method to synthesize shaped nanoparticles directly onto carbon supports using a mild reductant at room temperature. Specifically we have developed a method to created shaped PdNPs directly on porous carbon microspheres using coffee as a room temperature reductant. By adding ions, such as Br- and Fe3+, cubic and right bipyramidal nanoparticles can be synthesized. Other additives, such as ethylene glycol, are added to change the reaction kinetics, giving greater control over shape. Analysis by SEM indicates that our synthesized PdNPs are roughly 50 nm in dimension. The size, shape, and distribution of nanoparticles varied based on the ratios of the reactants in the different steps of the synthetic process. Current results from different ratios of reactants and adjustments in the synthetic process will be presented.

Progress in developing a more sustainable shaped nanoparticle synthesis on carbon substrates

247th National Meeting (2014)

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