Development of hydrophobic platinum catalyst for oxidation of tritium in JAEA. (December 2016)

• Record Type: Journal Article
• Authors: Iwai, Yasunori; Edao, Yuki; Asahara, Hiroo; Hayashi, Takumi
• Is Part Of: Nuclear materials and energy. Volume 9(2016)
• Page Start: 267
• Page End: 272
• Publication Date: 2016-12
• Subjects: Nuclear energy -- Periodicals; Nuclear fuels -- Periodicals; Nuclear reactors -- Materials -- Periodicals; Radioactive substances -- Periodicals; 621.4833
• DOI: 10.1016/j.nme.2016.08.018
• Languages: English
• ISSNs: 2352-1791

Abstract

Highlights: The reaction rate for tritium oxidation was investigated with hydrophobic catalysts. The particle size of platinum strongly affected the reaction rate. The order of reaction is 0.5 of hydrogen concentration at room temperature in case of a hydrogen content below 100 ppm. Abstract: To design a recombiner packed with hydrophobic catalyst for passive tritium oxidation, the development of manufacturing technology for hydrophobic platinum catalyst and the following analysis on reaction rate are essential. This presentation deals with the reaction rate for tritium oxidation over a hydrophobic platinum catalyst at temperature between room temperature and 473 K. Two kinds of hydrophobic platinum catalysts; supported with styrene-divinylbenzene and with silica were used for this test. The results indicate that 1) the particle size of platinum affects the reaction rate, 2) the order of reaction is 0.5 of hydrogen concentration at room temperature in case of a hydrogen content below 100 ppm. The rate-determining step approximation method is applied for the discussion on the reaction mechanism of tritium oxidation over platinum catalyst.