Preparation of Catalytic Materials Based on Metallurgy

Kameoka, Satoshi

doi:10.2320/materia.50.473

Materia Japan

2011

DOI: 10.2320/materia.50.473

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Preparation of Catalytic Materials Based on Metallurgy

Satoshi Kameoka¹

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2016

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Insights into the dominant factors of porous gold for CO oxidation

Kameoka

Tanabe

Miyamoto

et al. 2016

The Journal of Chemical Physics

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Three different porous Au catalysts that exhibit high catalytic activity for CO oxidation were prepared by the leaching of Al from an intermetallic compound, Al2Au, with 10 wt. %-NaOH, HNO3, or HCl aqueous solutions. The catalysts were investigated using Brunauer-Emmett-Teller measurements, synchrotron X-ray powder diffraction, hard X-ray photoelectron spectroscopy, field emission scanning electron microscopy, and transmission electron microscopy (TEM). Broad diffraction peaks generated during the leaching process correlated with high activity for all the porous Au catalysts. CO oxidation catalyzed by porous Au leached with NaOH and HNO3 is considered to be dominated by different mechanisms at low (< 320 K) and high (> 370 K) temperatures. Activity in the low-temperature region is mainly attributed to the perimeter interface between residual Al species (AlOx) and porous Au, whereas activity in the high-temperature region results from a high density of lattice defects such as twins and dislocations, which were evident from diffraction peak broadening and were observed with high-resolution TEM in the porous Au leached with NaOH. It is proposed that atoms located at lattice defects on the surfaces of porous Au are the active sites for catalytic reactions.

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Insights into the dominant factors of porous gold for CO oxidation

Kameoka

Tanabe

Miyamoto

et al. 2016

The Journal of Chemical Physics

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show abstract

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Preparation of Catalytic Materials Based on Metallurgy

Cited by 1 publication

References 28 publications

Insights into the dominant factors of porous gold for CO oxidation

Insights into the dominant factors of porous gold for CO oxidation

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