Atmospheric-Pressure Cold Plasma Activating Au/P25 for CO Oxidation: Effect of Working Gas

Nanomaterials
Jingsen ZhangXiuling Zhang

Abstract

Commercial TiO₂ (P25) supported gold (Au/P25) attracts increasing attention. In this work, atmospheric-pressure (AP) cold plasma was employed to activate the Au/P25-As catalyst prepared by a modified impregnation method. The influence of cold plasma working gas (oxygen, argon, hydrogen, and air) on the structure and performance of the obtained Au/P25 catalysts was investigated. X-ray diffraction (XRD), UV-Vis diffuse reflectance spectroscopy (DRS), transmission electron microscopy (TEM), and X-ray spectroscopy (XPS) were adopted to characterize the Au/P25 catalysts. CO oxidation was used as model reaction probe to test the Au/P25 catalyst. XRD results reveal that supporting gold and AP cold plasma activation have little effect on the P25 support. CO oxidation activity over the Au/P25 catalysts follows the order: Au/P25-O₂P > Au/P25-As > Au/P25-ArP ≈ Au/P25-H₂P > Au/P25-AirP. Au/P25-AirP presents the poorest CO oxidation catalytic activity among the Au/P25 catalysts, which may be ascribed to the larger size of gold nanoparticles, low concentration of active [O]s, as well as the poisoning [NOx]s. The poor catalytic performance of Au/P25-ArP and Au/P25-H₂P is ascribed to the lower concentration of [O]s species. 100% CO conversion ...Continue Reading

References

Nov 10, 2006·The Journal of Physical Chemistry. B·Laurent DelannoyCatherine Louis
Dec 13, 2006·Langmuir : the ACS Journal of Surfaces and Colloids·Ji-Jun ZouChang-Jun Liu
Dec 29, 2006·Small·Christopher J OrendorffCatherine J Murphy
Jan 16, 2010·Science·Claus Hviid Christensen, Jens K Nørskov

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Methods Mentioned

BETA
X-ray
Localized
Surface Plasmon Resonance

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