SiO2 nanoparticles have been synthesized by combining Stoberââ?¬â?¢s method and nonsurfactant process. The diameters and pore sizes\r\ncan be controlled by altering the template and its concentration. Mesoporous SiO2 obtained this way has extremely large surface\r\narea compared with most oxide supports, which benefits the catalytic performance. Pt nanoparticles were in situ grown on and in\r\nmesoporous SiO2 nanoparticles with low amount of the metal and high load ratio. Furthermore, we firstly developed a novel route,\r\ncalled ââ?¬Å?one-potââ?¬Â method, to prepare Pt/SiO2 catalyst where mesoporous silica preparing and Pt loading occurred in one step.This\r\nmethod is more efficient in saving reagent, since it can prevent Pt loss. In the meantime, it enables the template to reduce agent.\r\nThe catalytic activity of Pt/SiO2 samples was measured by CO oxidation. It is indicated that the supporting silica with mesopores\r\nis more active than silica with micropores.
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