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Report No.

Hydrogen production by $$gamma$$-ray irradiation from different types of zeolites in aqueous solution

Kumagai, Yuta; Kimura, Atsushi*; Taguchi, Mitsumasa*; Watanabe, Masayuki

H$$_{2}$$ production by irradiation of zeolite-water mixtures was studied, to investigate effect of zeolites in the reaction process for H$$_{2}$$. Four different types of zeolites were examined comparatively under anoxic and under aerated conditions. High production yields of H$$_{2}$$ were observed for the zeolites of high Al contents at low water fraction and under anoxic condition, compared to zeolites having lower Al contents. A comparison of the H$$_{2}$$ yields in connection with chemical analysis of the zeolites suggests that extraframework Al species in the zeolites are involved in a reaction pathway for H$$_{2}$$. Meanwhile, under aerated condition and at high mixing ratio of water, the difference in H$$_{2}$$ yield among the zeolites was suppressed and the yields of H$$_{2}$$ were lower than those under anoxic condition probably due to H$$_{2}$$O$$_{2}$$ produced by water radiolysis. The comparable H$$_{2}$$ yields suggest another reaction pathway for H$$_{2}$$ which is less dependent on the structure and composition of the zeolites.



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Category:Chemistry, Physical



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