Effect of Gold Particle Size on Steam Reforming of Methanol Over Au/CeO2–ZrO2 Catalysts
We examined the effect of the particle size of gold on steam reforming of methanol over Au/CeO2–ZrO2 catalysts. Gold was loaded onto CeO2–ZrO2 through deposition–precipitation. The average particle size (2–12 nm) of
the gold was controlled by thermal reduction under H2 at various temperatures and by chemical reduction with various reducing agents. The catalytic activity decreased significantly with increasing particle size of the gold. The turnover frequency at the interface between gold and
a support appeared to be independent of particle size in the range 2–5 nm, which implies that the perimeter of the particle may be the active site for this reaction. Methanol adsorption and conversion over these catalysts were also investigated with in-situ diffuse reflectance
infrared Fourier transform spectroscopy. Analytical results for various adsorbed intermediate species during methanol conversion suggests that transformation of methoxy species is facilitated by use of smaller gold particles.
Keywords: Gold Catalyst; Hydrogen; Methanol; Particle Size; Steam Reforming
Document Type: Research Article
Affiliations: Department of Energy Systems Research and Department of Chemical Engineering, Ajou University, 206, World Cup-ro, Yeongtong-Gu, Suwon 443-749, Republic of Korea
Publication date: 01 May 2016
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