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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 34, Number 12
BKCSDE 34(12)
December 20, 2013

Title	CO Oxidation Activities of Ni and Pd-TiO₂@SiO₂ Core-Shell Nanostructures
Author	Yeji Do, Insu Cho, Yohan Park, Debabrata Pradhan, Youngku Sohn*
Keywords	CO oxidation, TiO₂@SiO₂, Ni-TiO₂@SiO₂, Pd-TiO₂@SiO₂, Core-shell
Abstract	We prepared Ni and Pd-modified TiO2@SiO2 core-shell nanostructures and then analyzed them by scanning electron microscopy, optical microscopy, X-ray diffraction crystallography, FT-IR and UV-Visible absorption spectroscopy. In addition, their CO oxidation performance was tested by temperature-programmed mass spectrometry. The CO oxidation activity showed an order of Ni-TiO2@SiO2 (900 °C) < Ni-TiO2@SiO2 (90 °C) < Ni-TiO2@SiO2 (450 °C) in the first CO oxidation run, and greatly improved activity in the same order in the second run. The T10% (the temperature at 10% CO conversion) corresponds to the CO oxidation rate of 2.8 × 10−5 molCO gcat −1 s−1. For Ni-TiO2@SiO2 (450 °C), the T10% was observed at 365 °C in the first run and at 335 °C in the second run. For the Pd-TiO2@SiO2 (450 °C), the T10% was observed at a much lower temperature of 263 °C in the first CO oxidation run, and at 247 °C in the second run. The CO oxidation activities of transition metal modified TiO2@SiO2 core-shell nanostructures presented herein provide new insights that will be useful in developing catalysts for various environments.
Page	3635 - 3640
Full Text	PDF

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