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ヒドラジンを用いる高濃度硝酸イオンの還元に及ぼすPd-Cu/C触媒の組成の影響

Effects of composition of Pd-Cu/C catalyst for reduction of concentrated nitrate with hydrazine

門脇 春彦 ; 加藤 篤; 富岡 修 ; 目黒 義弘  ; 高橋 邦明 

Kadowaki, Haruhiko; Kato, Atsushi; Tomioka, Osamu; Meguro, Yoshihiro; Takahashi, Kuniaki

高濃度硝酸ナトリウム水溶液中の硝酸イオンを、液体還元剤を用いて分解するためのPd-Cu触媒の開発を行った。還元剤としてヒドラジンを用いた場合、Pd-Cu/C触媒は硝酸イオンの分解に対し活性を示した。触媒中のPd-Cu比が1.0:0.83の触媒が硝酸イオン及び反応中間体の亜硝酸イオンの還元分解に最適となること、及び、触媒中の担体割合の増加が活性を増加させることを明らかにした。

Palladium-copper catalysts were developed to decompose nitrate ion in a sodium nitrate solution of high concentration using a liquid reductant. The developed Pd-Cu/C catalyst showed a catalytic activity for decomposition of nitrate. It was found that the catalyst, in which Pd/Cu ratio was 1/0.83, showed the best activity for the decomposition of nitrate ion and nitrite ion as an intermediate and that the catalytic activity increased with an increase of support ratio in the catalyst.

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