• Kameoka, Satoshi
• Ohhashi, Satoshi
• Fukushima, Takeru
• Tsukuda, Ryota

Abstract

<jats:title>Abstract</jats:title><jats:p>Non-equilibrium Pd–Ru alloys were synthesized by leaching quasicrystal (icosahedral quasicrystal, IQC: Al<jats:sub>71</jats:sub>Pd<jats:sub>19</jats:sub>Ru<jats:sub>10</jats:sub>) and approximants (3/2 approximant, P<jats:sub>40</jats:sub>: Al<jats:sub>72</jats:sub>Pd<jats:sub>16.4</jats:sub>Ru<jats:sub>11.6</jats:sub>, 1/1 approximant, C<jats:sub>1</jats:sub>: Al<jats:sub>70.4</jats:sub>Pd<jats:sub>14.7</jats:sub>Ru<jats:sub>14.9</jats:sub>) of Al–Pd–Ru alloys with 20 wt% NaOH aqueous solution. The Pd-Ru alloys were investigated using XRD and HAADF-STEM, which showed that Pd and Ru were mixed and formed a non-equilibrium state (atomic ratio: 0.9 &lt; Pd/Ru &lt; 2). The Pd–Ru alloy obtained by leaching of P<jats:sub>40</jats:sub> phase was found to exhibit high catalytic performance toward CO oxidation than Pd and Ru catalysts obtained by leaching of Al<jats:sub>3</jats:sub>Pd (decagonal quasicrystal) and Al<jats:sub>13</jats:sub>Ru<jats:sub>4</jats:sub> (decagonal approximant), respectively (<jats:italic>i.e</jats:italic>., the alloying effect). Consequently, Al-Pd-Ru quasicrystals and approximant alloys are found to be useful precursors to obtain the non-equilibrium Pd-Ru alloys.</jats:p>

Topics

• phase
• x-ray diffraction
• leaching