Abstract
Effective dechlorination, as well as high dispersion, is necessary in the Pt nanocatalyst preparation from cheap chlorine-containing precursors like H2PtCl6. We herein report a facile approach to direct preparation of Pt nanocatalysts from oxidative dechloridation of the TiO2 (P25) supported H2PtCl6 by O2 plasma. Oxygen plasma can completely dechlorinate, enhance the dispersion of Pt nanoparticles, and create large number of low-coordinated sites, thus leading to the highest activity in WGS reaction. At 200 oC, the O2 plasma treated Pt nanocatalyst achieves CO reaction rate of 1.07 mmol·mg−1·h−1 in WGS reaction, which is significantly higher than that of H2 and N2 plasmas treated samples. The oxidative dechloridation mechanism of O2 plasma and structure–activity relationship of the supported Pt nanocatalysts were demonstrated.
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