caa a22 4500 606182012 CHVBK 20210128100813.0 cr unu---uuuuu 210128e20150901xx s 000 0 eng 10.1007/s10876-015-0885-7 doi (NATIONALLICENCE)springer-10.1007/s10876-015-0885-7 Palladium Nanoparticles Supported on Mesoporous Silica as Efficient and Recyclable Heterogenous Nanocatalysts for the Suzuki C-C Coupling Reaction [Elektronische Daten] [Phendukani Ncube, Thaane Hlabathe, Reinout Meijboom] Palladium (Pd) nanoparticles were synthesized using the dendrimer-template method and then immobilized on a silica support (SBA-15). The SBA-15 support material was specifically synthesized with a pore size large enough (d=6.6nm) to accommodate the dendrimer generation used (G-5 PAMAM-OH; d=5.4nm). The morphology of the Pd-supported catalyst (Pd0/SBA-15) was characterized by scanning electron microscopy coupled to an energy dispersive X-ray spectrometer which confirmed the elemental composition of the catalyst. Transmission electron microscopy confirmed the ordered array of the mesoporous SBA-15 and showed that the Pd NPs were indeed immobilized inside the pores. The catalyst had a pore size of 5.7nm, a pore volume of 0.78cm3/g and a surface area of 493m2/g as determined by surface adsorption/desorption measurements from BET analysis. The prepared Pd0/SBA-15 catalyst was an efficient recyclable heterogeneous catalyst for Suzuki coupling. The catalytic activity was investigated using different experimental conditions such as temperature, catalyst loading, base and solvent variations. The catalyst gave high conversions and turnover frequencies even in aqueous solutions and at fairly low temperatures showing the potential for the green synthesis of important organic molecules through C-C bond formation. Graphical Abstract: Springer Science+Business Media New York, 2015 Palladium nanoparticles nationallicence SBA-15 nationallicence Catalysis nationallicence Suzuki C-C coupling nationallicence Ncube Phendukani Department of Chemistry, Research Centre for Synthesis and Catalysis, University of Johannesburg, Auckland Park, P O Box 524, 2006, Johannesburg, South Africa aut Hlabathe Thaane Department of Chemistry, Research Centre for Synthesis and Catalysis, University of Johannesburg, Auckland Park, P O Box 524, 2006, Johannesburg, South Africa aut Meijboom Reinout Department of Chemistry, Research Centre for Synthesis and Catalysis, University of Johannesburg, Auckland Park, P O Box 524, 2006, Johannesburg, South Africa aut Journal of Cluster Science Springer US; http://www.springer-ny.com 26/5(2015-09-01), 1873-1888 1040-7278 26:5<1873 2015 26 10876 https://doi.org/10.1007/s10876-015-0885-7 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10876-015-0885-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ncube Phendukani Department of Chemistry, Research Centre for Synthesis and Catalysis, University of Johannesburg, Auckland Park, P O Box 524, 2006, Johannesburg, South Africa aut NATIONALLICENCE 700 1- Hlabathe Thaane Department of Chemistry, Research Centre for Synthesis and Catalysis, University of Johannesburg, Auckland Park, P O Box 524, 2006, Johannesburg, South Africa aut NATIONALLICENCE 700 1- Meijboom Reinout Department of Chemistry, Research Centre for Synthesis and Catalysis, University of Johannesburg, Auckland Park, P O Box 524, 2006, Johannesburg, South Africa aut NATIONALLICENCE 773 0- Journal of Cluster Science Springer US; http://www.springer-ny.com 26/5(2015-09-01), 1873-1888 1040-7278 26:5<1873 2015 26 10876