The selective catalytic reduction of NO by propylene or CO in the presence of excess oxygen is a system of great technological importance. The effect of Electrochemical Promotion (or Non-faradaic Electrochemical Modification of Catalytic Activity — NEMCA) was used to promote this reaction (C3H6 or CO/NO/O2) on Rh/YSZ catalyst-electrodes.
It was found that both the catalytic activity and the selectivity of the Rh catalyst-electrode is affected dramatically upon varying its potential with respect to a Au pseudoreference electrode. Catalytic rate enhancements up to 15000% and 6000% were observed in the case of NO reduction by propylene, while the product selectivity to N2 production is affected significantly (up to 200%) upon positive potential application. Remarkable promotion of the catalytic activity was also observed in the case of NO reduction by CO, since up to 20-fold increases both in catalytic rates and in NO conversion were obtained under NEMCA conditions.
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Pliangos, C., Raptis, C., Badas, T. et al. Electrochemical promotion of NO reduction by C3H6 and CO on Rh/YSZ catalyst — Electrodes. Ionics 6, 119–126 (2000). https://doi.org/10.1007/BF02375555
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