Reactions and speciation of technetium and rhenium in chloride melts: a spectroscopy study / Volkovich VA,May I,Charnock JM,Lewin B // PHYSICAL CHEMISTRY CHEMICAL PHYSICS. - 2002. - V. 4, l. 23. - P. 5753-5760.

ISSN/EISSN:

1463-9076 / нет данных

Type:

Article

Abstract:

The reactions of rhenium metal, rhenium oxides ( ReO2 and ReO3) and technetium dioxide with chlorine and hydrogen chloride were investigated in LiCl-KCl, NaCl-CsCl and NaCl-KCl based melts between 450 and 720 degreesC. Reaction progress was followed using in situ electronic absorption spectroscopy, with the spectra measured between 200 and 1100 nm. Samples of the quenched melts were analysed by EXAFS spectroscopy. Rhenium metal and rhenium oxides react with Cl-2 or HCl yielding hexachlororhenate(IV) species, although the reaction of rhenium metal with HCl is extremely slow even at 700 degreesC and no reaction between rhenium metal and Cl2 was observed below 500 degreesC. Chlorination of technetium dioxide in molten salts has been studied here for the. first time. TcO2 reacts with HCl producing {[}TcCl6](2-). However, the reaction of TcO2 with chlorine results in the oxidation of technetium to pertechnetate which is retained in the melt and production of a volatile solid, which is possibly a mixture of Tc(IV) chloride and Tc(VII) oxychloride. This is the first reported investigation into Tc speciation in molten salts.

Author keywords:

RAY-ABSORPTION SPECTROSCOPY; CRYSTAL-STRUCTURE; MOLTEN-SALT; TEMPERATURE; COMPLEXES; SPECTROELECTROCHEMISTRY; ELECTROCHEMISTRY

DOI:

10.1039/b205978a

Web of Science ID:

ISI:000179237500008

Соавторы в МНС:

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Другие поля

Поле	Значение
Publisher	ROYAL SOC CHEMISTRY
Address	THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND
Language	English
Keywords-Plus	RAY-ABSORPTION SPECTROSCOPY; CRYSTAL-STRUCTURE; MOLTEN-SALT; TEMPERATURE; COMPLEXES; SPECTROELECTROCHEMISTRY; ELECTROCHEMISTRY
Research-Areas	Chemistry; Physics
Web-of-Science-Categories	Chemistry, Physical; Physics, Atomic, Molecular \& Chemical
ResearcherID-Numbers	Volkovich, Vladimir/K-8339-2012
ORCID-Numbers	Volkovich, Vladimir/0000-0003-4438-1194
Number-of-Cited-References	41
Usage-Count-Last-180-days	1
Usage-Count-Since-2013	13
Journal-ISO	Phys. Chem. Chem. Phys.
Doc-Delivery-Number	615GM