Korean Journal of Materials Research, Vol.10, No.3, 223-226, March, 2000
수열합성법에 의한(Ni, Zn)-Ferrites의 초미세분말 합성공정 및 CO2CO 2 분해 특성 연구
Study on The Synthesis of The Ultra-Fine (Ni, Zn)-ferrite by The Hydrothermal Method and its CO 2 Decomposition
초록
산소 결핍 페라이트 (oxygen deficient ferrites, ODF) MeFe 2 O 4?δ 는 약 300 ? C 의 낮은 온도에서 CO 2 를 C와 O 2 로 분해한다. 본 연구에서는 (Ni_x,\;Zn_{1-x}Fe_2_4 초미세 페라이트 분말을 수열합성법으로 제조하여 CO 2 분해특성을 살펴보았다. 제조된 페라이트는 XRD 분석 결과, 페라이트의 전형적인 스피넬 구조를 보여주고 있으며, ICP-AES, EDS 정량분석에 의하여 초기 혼합 조성비와 거의 동일한 조성비로 합성되었음을 알 수 있었다. 제조된 (Ni, Zn)-ferrites 분말의 BET 비표면적은 약 110mg 2 /g이상의큰값으로나타났으며,입자크기는약5 10nm로매우작았다.산소결핍페라이트 (Ni_x,\;Zn_{1-x})Fe_2O_{4-{\delta}} 의 CO 2 분해 효율은 조성에 따라 큰 차이를 보이지 않았으며 3원계 (Ni, Zn)-ferrite가 Ni-ferrite보다 더 높았다.
The oxygen deficient ferrites (Ni x ,Zn 1?x )Fe 2 O 4?δ can decompose CO 2 as C and O 2 at a low temperature of about 300 ? C . Ultra powders of (Ni x ,Zn 1?x )Fe 2 O 4 for the CO 2 decomposition were prepared by the hydrothermal methods. The XRD result of synthesized ferries showed the spinel structure of ferrites and ICP-AES and EDS quantitative analyses showed the composition similar with the starting molar ratios of the mixed solution prior to reaction. The BET surface area of the synthesized(Ni, Zn)-ferrites was above 110m 2 /g and its particle size was very as small as about 5~10 nm. The CO 2 decomposition efficiency of the oxygen deficient ferrites( (Ni x ,Zn 1?x )Fe 2 O 4?δ ) was almost independent with composition and the CO 2 decomposition efficiency of ternary (Ni, Zn)-ferrites was better than of binary Ni-ferrites.
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