KINETICS AND THERMODYNAMICS OF U-REDUCTION BY NATURAL AND SIMPLE ORGANIC-MATTER
Nakashima, S
| HERO ID | 4936963 |
|---|---|
| In Press | No |
| Year | 1992 |
| Title | KINETICS AND THERMODYNAMICS OF U-REDUCTION BY NATURAL AND SIMPLE ORGANIC-MATTER |
| Authors | Nakashima, S |
| Journal | Organic Geochemistry |
| Volume | 19 |
| Issue | 4-6 |
| Page Numbers | 421-430 |
| Abstract | The hypothesized reaction mechanisms for U reduction by the dehydrogenation of hydroxyl groups and aliphatic hydrocarbonaceous moieties of lignite were verified by kinetic U reduction experiments using simple alcohols (1 -octadecanol and 2-propanol) and aliphatic hydrocarbons (n -octacosane). The rate constants and activation energies for U reduction by these alcohols are similar to those obtained for U reduction by lignite. The rate-determining step for U reduction by both simple and natural organic matter is hypothesized to be controlled by oxygen diffusion through U oxides. The equilibria of the system lignite-aqueous uranyl have been used to calculate standard free energy changes DELTAG-degrees for lignite dehydrogenation. Their comparison with those for the dehydrogenation of simple organic molecules supports the proposed reactions thermodynamically. |
| Doi | 10.1016/0146-6380(92)90009-M |
| Wosid | WOS:A1992KG33700009 |
| Is Certified Translation | No |
| Dupe Override | No |
| Is Public | Yes |
| Keyword | URANIUM; LIGNITE; REDUCTION; REACTION RATES; THERMODYNAMICS; ALCOHOLS; ALIPHATIC HYDROCARBONS |