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Nitrate Reduction Catalyzed by Bimetallic Silver-Copper Macroporous Foams
DEMS measurements were used to measure the formation of nitrogen, nitric oxide and nitrous oxide during nitrate reduction catalyzed by bimetallic silver-copper macroporous foams in acid media. For better sensitivity and to avoid possible interference from atmospheric nitrogen, isotope 15N was used in the nitrate salt (Na15NO3). Hence the m/z fragments of 30 (15N2), 31 (15NO), and 46 (15N2O) were monitored. For pure Ag foam, DEMS showed that the formation of NO corresponds perfectly to the reduction current measured by linear sweep voltammetry.
Figure 1 (right). DEMS and linear sweep voltammetry (LSV) results for nitrate reduction on bimetallic Ag–Cu macroporous foams in acid media.
For pure Cu foam, DEMS showed that NO formation starts only when the reduction current reaches the peak. This clearly indicates that, on this material, the reduction of nitrate leads to other liquid products. DEMS runs allowed the measurement of the onset potential corresponding to the NO production on all materials. The correlation between this item and the peak potential of nitrate reduction led to the conclusion that this reaction takes place via nitric oxide as intermediate.
Project Summary by: Dr. Vasilica-Adriana Badets, Laboratoire d’Electrochimie et de Chimie Physique du Corps Solide, Université de Strasbourg, Institut de Chimie, UMR CNRS 7177, 4 Rue Blaise Pascal, CS 90032, 67081, Strasbourg Cedex, France.
Paper Reference: Sun, J., Zhou, Y., Stéphanie Loyaux-Lawniczak, Gwenaelle Kéranguéven, Boudon, C., Bonnefont, A., Laurent Ruhlmann and Vasilica Badets (2024) ‘Nitrate reduction catalyzed by bimetallic silver-copper macroporous foams.’ ChemCatChem. Wiley, 16(21). DOI: 10.1002/cctc.202400220.
Hiden Product: HPR-40 DEMS.
