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Pd-Cu担持触媒とヒドラジンを用いる硝酸イオンの分解反応における触媒活性に及ぼすPd-Cu組成及び担体の影響

Effects of Pd-Cu composition and support on catalytic activity for nitrate decomposition with Pd-Cu catalyst and 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

液体還元剤のヒドラジン及びPd-Cu担持触媒を用いる硝酸ナトリウム水溶液中の硝酸イオンの分解反応において、触媒活性に与えるPd-Cu組成比及び担体材料の影響を調べた。無電解析出法により作製した触媒金属のPd-Cuは合金状態となり、また、その表面組成は担体材料の影響を強く受けることがわかった。Pd-Cu担持炭素粉末触媒による硝酸イオンの分解反応において、硝酸イオン及び中間生成物である亜硝酸イオンの分解に対して活性が最大となるPd-Cu比を明らかにした。また、触媒活性が担体材料によって変化することを見いだした。

We studied effects of Pd-Cu composition and support material on catalytic activity in the nitrate decomposition with Pd-Cu catalyst and hydrazine as a liquid reductant. It was found that Pd was alloyed with Cu in the Pd-Cu catalyst prepared by electroless deposition method and the Pd-Cu surface composition was strongly influenced by the support material. The Pd-Cu composition giving the maximal catalytic activity for decomposition of nitrate ion and nitrite ion as intermediate was determined in the denitration with the Pd-Cu loaded carbon catalysts. And also it was found that the catalytic activity varied according to the support material.

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