| Summary: | 博士 === 大同大學 === 材料工程學系(所) === 95 === The motivation of this study is to develop effective functionalized catalytic hybrid nanomaterials and to investigation the structure effect on the catalytic activities. As a catalyst support, the carbon nanotubes with high graphitization and surface area lead to a brand-new improvement in the application of the hybrid catalytic nanomaterials system.
This thesis presented the nano hybrids of TiO2/CNTs, Pt/CNTs and Pt/TiO2/CNTs systems. The results revealed that the hybrid TiO2/CNTs nanomaterials were prepared successfully by sol gel technique and all the hybrid TiO2/MWCNTs nanomaterials exhibited anatase phase TiO2, even the post heat treatment up to 1000 oC. The anatase to rutile transformation was inhibited by the pinning effect of MWCNTs. By the polyol process, we synthesized the hybrid Pt/MWCNTs nanomaterials. The globular Pt nanoparticles about 25.7 weight percent with a size roughly ranged from 5 to 10 nm were adhered individually to the purified MWCNTs. Furthermore, the hybrid Pt/CNTs nanomaterials showed much more stable activity and selectivity in the catalytic test.
Finally, the sol-gel process and polyol process were combined to synthesize the new hybrid Pt/TiO2/CNTs nanomaterials successfully. The excellent fine Pt nanoparticles around 2-3 nm decorated not only the anatase TiO2 nanoparticles (around 40 nm), but the purified multi-wall carbon nanotubes are observed obviously. Additionally, the Pt/TiO2/MWCNTs and Pt/MWCNTs nanomaterials catalyze 100% conversion of CO oxidation at room temperature due to introducing the carbon nanotubes as the support. Furthermore, active Pt/TiO2/MWCNTs photocatalyst can keep the CO oxidation continuously under the UV light illumination without poison.
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