A chronopotentiometric study of the stability of oxide ion in molten nitrates

✍ Scribed by A.A. El Hosary; A.M. Shams El Din

• Publisher: Elsevier Science
• Year: 1971
• Tongue: English
• Weight: 568 KB
• Volume: 16
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/0013-4686(71)85135-6

✦ Synopsis

The chronopotentiometric behaviour of NaNO,-KNO* melts made basic with OH-, 04*-or electrogenerated Oa-has been studied in the temperature range 240-350°C. The anodic curves exhibit two diffusion-controlled steps corresponding to the reactions and 10z-j -2e-c+0, NO,--e 4 NO,. Oxygen evolution from the melt takes place irreversibly and involves most probably OH-ions. The transfer coefficient of the reaction is 05. The product irllr of the frrst step decreases linearly with time due to the transformation of the free, oxidizable lOa-into a bound, inactive form. The rate of disappearance of lop-l has been determined at a number of temperatures; the activation energy of the reaction is 3.42 Kcaljmole. R&an&-Etude du comportement chronopotentiom&rique des m&nges NaNOsKNO, rendus basiques par OH-, OIs-ou OS-engendre tlectriquement, dam le domalne de temp&atures 24O-350°C. Les courbes anodiques manifestent deux &apes rQulatrices de la diffusion correspondant aux reactions : et 0s-+2e+*01