Low temperature CO pulse adsorption for the determination of Pt particle size in a Pt/cerium-based oxide catalyst |
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| Authors: | Toshitaka Tanabe, Yasutaka Nagai, Takeshi Hirabayashi, Nobuyuki Takagi, Kazuhiko Dohmae, Naoki Takahashi, Shin&#x ichi Matsumoto, Hirohumi Shinjoh, Junko N. Kondo, Jaap C. Schouten,Hidde H. Brongersma |
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| Affiliation: | Toshitaka Tanabe, Yasutaka Nagai, Takeshi Hirabayashi, Nobuyuki Takagi, Kazuhiko Dohmae, Naoki Takahashi, Shin’ichi Matsumoto, Hirohumi Shinjoh, Junko N. Kondo, Jaap C. Schouten,Hidde H. Brongersma |
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| Abstract: | Unexpectedly large amounts of CO adsorption have resulted from a pulse adsorption experiment at 323 K, giving about 300% Pt dispersion in a Pt/cerium-based oxide catalyst. An in situ diffuse reflectance infrared Fourier transform spectroscopic investigation on a Pt/cerium-based oxide during CO adsorption has revealed that carbonate species on the cerium oxide surface are responsible for the unrealistically large CO adsorption at 323 K, as a result of CO spillover. Lowering the temperature to 195 K considerably diminished the amount of CO adsorption. The size of the Pt particles in the Pt/cerium-based oxide catalyst was determined by CO pulse adsorption at 195 K and showed good agreement with the particle size determined by X-ray diffraction and low energy ion scattering. This indicates that CO pulse adsorption at 195 K is a useful technique to reliably estimate the Pt particle size in a Pt/cerium-based oxide catalyst. |
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| Keywords: | Pt particle size Cerium-based oxide CO adsorption X-ray diffraction Low energy ion scattering |
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