CO Oxidation Activities of Ni and Pd-TiO2@SiO2 Core-Shell Nanostructures

Bulletin of the Korean chemical society

Insu Cho¹  Yohan Park¹  Debabrata Pradhan¹  Youngku Sohn¹  Yeji Do¹ 

关键词: CO oxidation;    TiO2@SiO2;    Ni-TiO2@SiO2;    Pd-TiO2@SiO2;    Core-shell;   

DOI  :  

学科分类：化学（综合）

来源: Korean Chemical Society

【 摘 要 】

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.

【 授权许可】

Unknown