Synthesis, Characterization and Evaluation of Pd-Nanoparticles Supported on Titania Nanofibers as Catalysts Heck Reactions
Nanomaterials have been proposed to have new, exerting properties relative to bulk materials due to the quantum level interactions that exist and they also offer enormous surface to volume ratios that would be invaluable in heterogeneous catalyst applications. Striking novel catalytic properties including greatly enhanced reactivities and selectivities have been reported for nanoparticle (NP) catalysts as compared to their bulk counterparts. However, these nanopartic1es are available as unsupported powders. A new approach aimed at distributing novel materials of this kind on a practically attainable fiber matrix which itself offers a very high surface area will make it possible to take full advantage of their unique properties. The work proposed herein will be aimed at producing such catalytic materials by distributing Pd nanoparticles on metal oxide, anatase Ti02, nanofibers having surface chemistry conducive for adsorption. These will be characterized in terms of morphology, Pd loading and crystalline structure using UV-vis, XRD, XFS, SEM and TEM and the performance of the heterogeneous catalytic will be evaluated using Heck carboncarbon coupling reactions. The rate of reaction and C-C coupling will be monitored using UV - vis, GC - MS, IR and JH and J3C NMR. The fabricated heterogeneous catalyst is expected to have the advantages of merging the beneficial properties of metals and organic polymers; production of a catalyst with long lifetime and is more selective, active and stable. Since industrial processes such as manufacture of polymers, plastics, pharmaceuticals and detergents are based on heterogeneous catalysis, the novel Pd - Ti02 nanocatalyst will be very applicable in these industries.