In the heavy water moderated nuclear reactors, deuterium and oxygen are generated by the radiation decomposition of the heavy water, and are released to the gas phase above the moderator in the nuclear reactor, therefore, the recombiner is needed for the nuclear reactors to prevent the potential explosion hazard.
This study has been carried out in order to obtain the dueterium-oxygen contact reaction rate equation on the surface of almina-paradium catalysts which are used for the purpose of recombining deuterium and oxygen in the nuclear reactors The reaction rate equation was obtained experimentally with the tubular-flow reactor in which the Al
2O
3-Pd catalysts were packed, at 60° to 150°C and 1 atm.
The alumina-paradium catalysts with 0.5w/o paradium were used in this experiments. The obtained reaction rate equation is the following,
r=
K0(n
0D20O2-
x)(2n
0O2-
x)/(1-
mx)
where,
K0 and
m are constant,
x is the rate of reaction of deuterium and n
0D2, n
0O2 are the initial deuterium and oxygen consentrations.
It was observed that activity of the catalysts was decreased by moisture below certain catalyst temperature. If the catalyst temperature is maintained over about 50°C, the Al
2O
3-Pd catalysts can be used securely without influence of moisture in the nuclear reactors for many hours.
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