Reductive atmosphere of supercritical water with RuO2 resulting in TcO2 colloid: Spectroscopic, morphological and crystallographic study on solutions and precipitates in Hastelloy C-22

T. Yamamura, K. Yubuta, I. Satoh, Y. Yoshida, Y. Shiokawa, T. Sekine, W. Sugiyama, K. C. Park, H. Tomiyasu

研究成果: Contribution to journalArticle査読

1 被引用数 (Scopus)

抄録

In order to study the complicated behavior of technetium observed under various conditions of supercritical water (SCW), i.e. quantitative transfer to solid phase, strong adsorption onto the metal surface, or efficient dissolution from the metal surface, solutions and precipitates prepared in reactors made of Hastelloy C-22 in contact with the SCW containing technetium solutions were studied by absorption spectroscopy, TEM, EDX and electron diffraction. Under SCW with or without H2O2, NiCr2O4 and NiMoO4 was produced as the scales (corrosion products) of Hastelloy C-22. Under SCW with RuO2 the formation of colloidal structure comprised of ruthenium metal and TcO2, which may be named as "Tc-Ru-Colloid", were observed. It is worthy of note that the formation of TcO42- from pertechnatate TcO4- (+0.596 V) and the disproportionation of TcO42- is plausible at present in spite of the moderate reductive atmosphere (-0.533 to +0.114 V) estimated from the observation (the existence of TcO2 and the absence of NiMoO4) by TEM and electron diffraction.

本文言語英語
ページ(範囲)317-323
ページ数7
ジャーナルJournal of Supercritical Fluids
43
2
DOI
出版ステータス出版済み - 12 2007
外部発表はい

All Science Journal Classification (ASJC) codes

  • 化学工学(全般)
  • 凝縮系物理学
  • 物理化学および理論化学

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