研究報告3 - 1 論文 - Original
担持白金触媒によるトリチウム化メタンの燃焼
Oxidation of Tritiated Methane by Supported Platinum Catalyst.
松山 政夫、宮田 洋子、渡辺 国昭、竹内 豊三郎
富山大学トリチウム科学センター
富山市五福3190
Masao MATSUYAMA, Yoko MIYATA, Kuniaki WATANABE, Toyosaburo TAKEUCHI
Tritium Research Center, Toyama University,Gofuku 3190, Toyama 930, JAPAN
(Received December 24, 1983)
Abstract
The oxidation reaction of CH4 and CH3T by silica- and alumina-supported catalysts was studied.
The oxidation rate of methane was pseudo-first order with respect to the methane pressure and the catalytic activity of Pt/Al2O3
catalyst was higher than that of the Pt/SiO2 catalyst. A kinetic isotope effect was observed for the oxidation reaction on the Pt/Al2O3
catalyst; the activation energies for CH4 and CH3T were 19.2 and 17.3 Kcal/mol, respectively.
A large part of the tritium in CH3T was removed as the tritiated water, but some of it was trapped on the supported catalyst.
Tritium was also found to be trapped on the surface of alumina, the amount being comparable to that observed for the Pt/Al2O3 catalyst.
Thus, the exchange reaction between CH3T and hydroxyl group on the Pt/Al2O3 catalyst is considered to a predominant role in the trapping of
tritium on the catalyst.
In regard to waste handling, the above findings demonstrate contamination of the oxidation catalyst due to the captured tritium.