Hierarchically structured macroscopic Pt-silica spheres were prepared in a one-step procedure using emulsion based sol-gel processing. The composition of the precursor solution was varied in order to study the influence of the Pt compound, the surfactant and the preparation method on the Pt particle size and concentration. Platinum was immobilized by coordination with an aminosilane and the nanoparticles were stabilized using different triblock copolymers. For removal of the surfactant, calcination as well as solvent extraction was used and the co-condensed samples were compared with silica spheres functionalized by ion-exchange. The activities of different catalysts were investigated in the methylcyclopentane ring opening reaction, which demonstrated a beneficial effect of the macroscopic shape and hierarchical structure of the support material. The simultaneous structural control over several scales of dimension from the macroscopic shape of the support to the nanometer size of the Pt nanoparticles allows the easy and highly reproducible synthesis of tailor-made catalysts.     «

Hierarchically structured macroscopic Pt-silica spheres were prepared in a one-step procedure using emulsion based sol-gel processing. The composition of the precursor solution was varied in order to study the influence of the Pt compound, the surfactant and the preparation method on the Pt particle size and concentration. Platinum was immobilized by coordination with an aminosilane and the nanoparticles were stabilized using different triblock copolymers. For removal of the surfactant, calcinat...     »

ISI Document Delivery No.: 992LU Times Cited: 0 Cited Reference Count: 30 Scholz, Sabine Shi, Hui Lercher, Johannes A. Wacker Chemie AG Financial support by Wacker Chemie AG and fruitful discussions within the Wacker-Institut fur Siliciumchemie and the framework of the network of excellence IDECAT is gratefully acknowledged. The authors thank Dipl.-Ing. Martin Neukamm for AAS measurements, Dr. Oliver Gobin for the high-resolution photographs and Dipl.-Chem. Sonja Wyrzgol for helpful discussions. 0 Springer/plenum publishers New york     «

ISI Document Delivery No.: 992LU Times Cited: 0 Cited Reference Count: 30 Scholz, Sabine Shi, Hui Lercher, Johannes A. Wacker Chemie AG Financial support by Wacker Chemie AG and fruitful discussions within the Wacker-Institut fur Siliciumchemie and the framework of the network of excellence IDECAT is gratefully acknowledged. The authors thank Dipl.-Ing. Martin Neukamm for AAS measurements, Dr. Oliver Gobin for the high-resolution photographs and Dipl.-Chem. Sonja Wyrzgol for helpful discussions....     »