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• W2086507590 abstract "Co(III)-cyclam (cyclam = 1,4,8,11-tetra-azacyclotetradecane) has been demonstrated to act as a new and excellent catalyst for NO−3 and NO−2 reduction by cyclic voltammetry and controlled-potential electrolysis (CPE). CPE of a KNO3 solution at an Hg electrode gave hydroxylamine selectively with high current yields (ca. 90%); the current densities were > 5 mA/cm2 in 0.1 M KNO3 solution at −1.5 V (vs. SCE) in the presence of only 20 μM or less of the catalyst. The turnover frequency was > 500 h−1 (using an 8 cm2 Hg pool electrode), and no deactivation of the catalyst was observed after CPE for several hours. At Ag, Cu and Pb electrodes, hydroxylamine was reduced further to give ammonia preferentially. Ni(II)-cyclam also acted as a catalyst, but the effective potential region was ca. 0.2 V more negative than that of Co(III)-cyclam. Some mechanistic investigations suggested that the formation of Co(I)- and Ni(I)-cyclam, which adsorbed onto the electrode surface, would be effective, and also that the role of cyclam as a ligand would be to provide sufficient nucleophilicity of the catalysts and/or a suitable structure for interaction with nitrogen oxyanions." @default.
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• W2086507590 date "1987-06-01" @default.
• W2086507590 modified "2023-10-10" @default.
• W2086507590 title "Electrocatalytic reduction of nitrate and nitrite to hydroxylamine and ammonia using metal cyclams" @default.
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• W2086507590 doi "https://doi.org/10.1016/0022-0728(87)85092-1" @default.
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