Hydrogen formation from water adsorbed on zeolite during gamma-irradiation.
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概要
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The γ-radiolysis of water adsorbed on synthetic zeolite, MS 13X (Molecular Sieve 13X), has been investigated by the product analysis method using gas chromatography. One of the main products is molecular hydrogen, the <I>G</I> value of which increases with increasing amount of water adsorbed on MS 13X and reaches a first plateau (0.42) at ca. 4 mmol of water per g of MS 13X. At ca. 6 mmol g<SUP>−1</SUP> of water, it resumes the increase and finally approaches a second plateau (1.2) at ca. 9 mmol g<SUP>−1</SUP>. The formation of hydrogen is depressed by an electron scavenger, while ammonia, a scavenger of positive hole, enhances the hydrogen formation. The result indicates that hydrogen is produced through a reaction of water with electrons generated in MS 13X. The rate constant for the reaction of electrons with water adsorbed on MS 13X is estimated to be (2.6±0.3)×10<SUP>8</SUP> dm<SUP>3</SUP> mol<SUP>−1</SUP> s<SUP>−1</SUP>, on the assumption that rate constants for reactions of electrons with some electron scavengers determined in liquid cyclohexane can be applied to this system.
- 公益社団法人 日本化学会の論文
著者
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Masuda Takahiro
Department Of Obstetrics And Gynecology School Of Medicine Keio University
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NAKAZATO Chiyoko
Department of Chemistry, Faculty of Science, Tokyo Metropolitan University
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Aoki Masayoshi
Department of Chemistry, Faculty of Science, Tokyo Metropolitan University
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MASUDA Takahiro
Department of Anesthesiology, Tokyo Metropolitan Ohtsuka Hospital
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Masuda Takahiro
Department of Chemistry, Faculty of Science, Tokyo Metropolitan University
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