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Report No.

Hydrogen and hydrogen peroxide productions by $$gamma$$-irradiation of A-, X-, Y- and mordenite type zeolites in aqueous solution

Kumagai, Yuta   ; Kimura, Atsushi; Taguchi, Mitsumasa

Zeolite minerals are suitable adsorbents for removal of radioactive cesium in water, because of their high radiation resistances. However, irradiation of zeolites results in decomposition of water adsorbed on the zeolites. Water decomposition produces hydrogen (H$$_{2}$$) and hydrogen peroxide (H$$_{2}$$O$$_{2}$$). H$$_{2}$$ production has a risk of making an explosive gas mixture. H$$_{2}$$O$$_{2}$$ causes corrosion of metals and alloys. Therefore, the radiation effects are required to be assessed and controlled. In this study, H$$_{2}$$ and H$$_{2}$$O$$_{2}$$ production by irradiation of zeolites in aqueous solution are comparatively studied among different types of zeolites, A-, X-, Y- and mordenite-types. The mixtures of the zeolites and aqueous solution were irradiated by $$^{60}$$Co $$gamma$$-rays. The A-type and the X-type zeolites produced more H$$_{2}$$ than the Y-type and the mordenite-type. In contrast, the H$$_{2}$$O$$_{2}$$ production was inhibited by the addition of zeolites. The A-type and the X-type zeolites showed remarkable inhibition. The A-type and the X-type contains more aluminum in their frameworks than the others do. Therefore, the results suggest that aluminum sites have an important role in the reactions induced by irradiation.



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