Changes in Reaction Rates and Structure of Solid Reactant Concerning the Iron Compounds in the UT-3 Thermochemical Hydrogen Production Cycle.

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  • Shiizaki Shinji
    Div. of Chem. and Biol. Sci. and Tech., Tokyo Univ. of Agr. and Tech.
  • Yamamoto Kyoko
    Div. of Chem. and Biol. Sci. and Tech., Tokyo Univ. of Agr. and Tech.
  • Kameyama Hideo
    Div. of Chem. and Biol. Sci. and Tech., Tokyo Univ. of Agr. and Tech.

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  • ＵＴ‐３熱化学水素製造サイクルのＦｅ系反応固体におけるサイクル使用に伴う反応速度と構造の変化
  • UT-3 ネツカガク スイソ セイゾウ サイクル ノ Feケイ ハンノウ コタ

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Changes in reaction rates of Fe3O4 bromination and FeBr2 hydrolysis under cyclic operation of the UT-3 thermochemical water decomposition cycle were analyzed.<BR>The solid reactant was prepared from Fe3O4 powder and ZrSiO4 powder as binder. The reaction rate equations were determined as follows for the bromination of Fe3O4 and hydrolysis of FeBr2 in the 1st cycle.<BR>bromination : r [mol · m-3 · s-1] =-dCFe3O4 / dt<BR>= 1.5 × 10-3CHBr1.5CH2O-0.5CFe3O4<BR>hydrolysis : r [mol· m-3 · S-1] =-dCFeBr2 /dt<BR>= 0.018 CH2OCFeBr20.5<BR>In cyclic operation, the reaction rate constants of both reactions after 20 cycles were 1.4 times as large as those for the 1st cycle. Analysis of the pore distribution showed that a large amount of reactant Fe-compound in the pellet moved from pores of around 1 μm in diameter to newly appeared pores of around 10 μm during 20 reaction cycles. The BET surface area of Fe3O4 after 20 cycles was about twice as large as that for the 1st cycle. It was considered that these structure changes caused the changes in the reaction rate constants.

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