Characterization of Argon Glow Discharge Plasma Reduced Pt/Al2O3Catalyst
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Abstract
An argon glow discharge plasma was used to treat H2PtCl6 impregnated Al2O3 powder at room temperature. The obtained sample was characterized by ultraviolet−visible spectroscopy (UV−vis), X-ray photoelectron spectroscopy (XPS), CO adsorbed diffuse reflectance Fourier transform infrared (DRIFT) spectroscopy, X-ray powder diffraction (XRD), and transmission electron microscopy (TEM) equipped with energy dispersion X-ray spectrometer (EDX). UV−vis, XPS, and CO adsorbed DRIFT confirmed that Pt ions were reduced to metallic Pt during the plasma treatment. XRD and TEM revealed that the structure of the plasma reduced Pt nanoparticles is face centered cubic. The Pt particle shape is irregular but uniformly distributed on the Al2O3. The average particle size of plasma reduced 3 wt % Pt/Al2O3 is 3.3 nm, estimated by TEM. For the partial oxidation of methane, the plasma reduced 0.5 wt % Pt/Al2O3 shows comparable activity to a conventional hydrogen reduced sample. Furthermore, the plasma reduced 0.5 wt % Pt/Al2O3 sample is more stable and more resisted to coke formation. The argon glow discharge plasma reduction at room temperature may provide an environmentally friendly, fast, and simple approach to prepare supported metal nanoparticles and also a promising alternative to hydrogen reduction at elevated temperature.
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