Anodic polarization measurements for various ruthenium (Ru) alloys revealed that hexagonal close-packed nanoporous Ru (np-Ru) can be fabricated by dealloying or selective dissolution of manganese (Mn) from RuMn alloy. The pore size and specific surface area of fabricated npRu were 3 nm and 51.5 m 2 g ¹1 , respectively. An electron diffraction pattern suggested a polycrystalline nature of the fabricated np-Ru, which is perhaps due to the change in the crystal structure during dealloying. The oxidation of carbon monoxide (CO) was efficiently catalyzed by the npRu. The activation energy was 82 kJ mol ¹1 which is comparable to that of the polycrystalline RuO 2 /Ru catalyst. The present np-Ru is a novel candidate as a recoverable Ru catalyst.
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