Competitive oxidation of formaldehyde and formate on amorphous copper-palladium-zirconium alloy electrodes in alkaline media |
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Authors: | Katsunori Nishimura Keiiti Yamaguti Ken-Ichi Machida Michio Enyo |
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Affiliation: | (1) Research Institute for Catalysis, Hokkaido University, 060 Sapporo, Japan |
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Abstract: | Raney-type Cu–Pd alloy electrodes were prepared from amorphous Cu–Pd–Zr ternary alloys by treatment with aq. HF, and competitive anodic oxidation reactions of HCHO and HCOO– were studied on these electrodes in alkaline media. The initial HCHO oxidation product was HCOO– even on Pd or Pd-rich alloy electrodes which should be more active to the HCOO– oxidation than to HCHO. The product HCOO– was oxidized only after a large decrease of the HCHO concentration in the electrolyte. The oxidation rate of HCOO– was considerably lowered by the existence of even a small amount of HCHO, as well as by the introduction of CO. These results suggest that the HCHO electro-oxidation is accompanied by production of a surface contaminant such as adsorbed CO. The optimum nominal Pd atomic fraction in the Cu–Pd alloy electrodes suitable for the steady simultaneous oxidation of HCHO and HCOO– in mixed solution was shown to be 0.25 and 0.4 in 1.0 M NaOH (M=moldm–3) and 0.5 M K2CO3, respectively. |
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