Physicochemical study on supercritical fluids and their industrial use

In this study, we confirm a tetrahedral structure for a Co 2+ complex in supercritical water instead of the octahedral structure in normal water. The absorption spectra of Ru 2+ complexes were observed for only stable species such as [Ru(phen) 3] 2+ in supercritical water. The photochemistry of uran...

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Bibliographic Details
Published in:Progress in nuclear energy (New series) 2000, Vol.37 (1), p.411-416
Main Authors: Tomiyasu, H., Kim, S.Y., Tsukahara, T., Harada, M.
Format: Article
Language:English
Subjects:
Chemistry
Exact sciences and technology
General and physical chemistry
Solutions
Solvation. Solvent properties
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Summary:In this study, we confirm a tetrahedral structure for a Co 2+ complex in supercritical water instead of the octahedral structure in normal water. The absorption spectra of Ru 2+ complexes were observed for only stable species such as [Ru(phen) 3] 2+ in supercritical water. The photochemistry of uranyl(VI)-tributylphosphate(TBP) complex in supercritical carbon dioxide(scCo 2) was studied in the pressure range of 8-40 MPa and from 289 to 336K. In order to examine the hydrogen-bond structures and molecular motions of supercritical water and non-aqueous solvents, their 1H spin-lattice relaxation times were measured under sub- and supercritical conditions by using high-pressure NMR. NiMo/Al 2O 3 was chosen as a catalyst because of its catalytic activity for hydrocracking aromatic structures.
ISSN:0149-1970
DOI:10.1016/S0149-1970(00)00080-9