$Co(OH)_2$로부터 수열법에 의한 코발트 분말제조

Hydrothermal Reduction of $\Co(OH)_2$ to Cobalt Powder Preparation

  • Kim, Dong-Jin (Korea Institute of Geology, Mining and Materials(KIGAM)) ;
  • Chung, Hun-Saeng (Korea Institute of Geology, Mining and Materials(KIGAM)) ;
  • Yu Kening (Institute of Chemical Metallurgy, CAS)
  • 발행 : 1999.07.01

초록

$PdCl_2$를 촉매제로 사용한 수소환원분위기에서 $Co(OH)_2$ 로부터 약 400nm크기인 구형의 코발트분말 제조에 관한 연구를 수행하였다. 본 실험에서 코발트의 환원반응속도는 표면반응 코어모델식에 잘 일치하였으며 이때 활성화 에너지는 $145~195^{\circ}C$에서 약 55.6KJ/mol 이었다. 또한 코발트의 환원속도는 초기 수소분압의 0.63승에 비례하는 가스화학흡착반응식으로 표시할 수 있다.

An investigation was performed to prepare spherical cobalt powder with about particle size of 400nm from aqueous cobalt hydroxide slurry under hydrothermal reduction conditions using palladium chloride as a catalyst. The reduction kinetics was in good agreement with a surface reaction core model equation. and the activation energy obtained from Arrhenius plots was 55.6 KJ/mol at the temperature range of $145~195^{\circ}C$. Additionally, the study showed that the cobalt reduction rate is proportional to the initial hydrogen pressure with a reaction order of n=0.63. which corresponds to the gas chemisorption reaction type.

키워드

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