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        Lean Cu-immobilized Pt and Pd films/–H+ Conducting Membrane Assemblies: Relative Electrocatalytic Nitrate Reduction Activities

        Mohammad A. Hasnat,Sami Ben Aoun,Mohammed M. Rahman,Abdullah M. Asiri,Norita Mohamed 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.28 No.-

        Asymmetric reactors having the configuration (PtjNafionjM–Cu, M = Pt, Pd) were designed and appliedto the electrocatalytic nitrate reduction reaction (NRR) with no supporting electrolyte. Theelectrochemically–fabricated Cu–M (M = Pt, Pd) catalysts showed a highly-efficient catalytic activityby effectively reducing more than ca. 99% of nitrate ions, under static-reactor conditions, with first-orderrate constants of ca. 0.040 min 1 and ca. 0.057 min 1 for Cu–Pt and Cu–Pd, respectively. Similarreactivity trends were observed under flow mode irrespective of flow rates while NRR rates werepredominantly controlled by diffusion-limited mass-transfer. A maximum of ca. 93% nitrate removal atCu–Pd catalyst was achieved within ca. 60 min. The comparatively lower CuO content of ca. 9%, asconfirmed by XANES, resulted in a greater number of free NRR active sites inducing the superior catalyticactivity of the Cu–Pd catalyst. On the other hand, NRR product selectivity investigations showed that Cu–Pd catalyst was highly ammonia–selective with a maximum of ca. 24% selectivity at a flow rate of0.1 mL min 1, while Cu–Pt catalyst was much selective to intermediate nitrite ions reaching a maximumof ca. 35% selectivity at the same flow rate.

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