Synthesis Processing of the Fine (Ni, Zn)-ferrite Powder for <TEX>$CO_2$</TEX> Decomposition of the Flue Gas in the Iron Foundry

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J. Korean Ceram. Soc. > Volume 37(2); 2000 > Article

Journal of the Korean Ceramic Society 2000;37(2): 164.

제철소의 연소배가스 $CO_2$ 분해용 (Ni, Zn)-ferrite 미세분말 합성공정 연구

김정식, 안정률

서울시립대학교 재료공학과

Synthesis Processing of the Fine (Ni, Zn)-ferrite Powder for $CO_2$ Decomposition of the Flue Gas in the Iron Foundry

ABSTRACT

Flue gases in the iron foundry consist of 15~20% CO2 as an air pollution gas whose emission should be mitigated in order to protect the environment. In the present study, ultrafine powders of NixZn1-xFe2O4 as a potential catalyst for the CO2 decomposition were prepared by the coprecipitation methods. Oxygen deficient ferrites (MeFe2O4-$delta$) can decompose CO2 as C and O2 at a low temperature of about 30$0^{circ}C$. The XRD result of synthesized ferrites showed the spinel structure of ferrites and ICP-AES and EDS quantitative analyses showed the composition similar with initial molar ratios of the mixed solution prior to reaction. The BET surface area of the (Ni, Zn)-ferrites was about 77~89.5$m^2$/g and their particle size was observed about 10~20 nm. The CO2 decomposition efficiency of the oxygen deficient (Nix, Zn1-x)-ferrites was the highest at x=0.3, and the ternary (Ni, Zn)-ferrites was better than that of binary Ni-ferrites.

Key words: (Ni, Zn)-ferrite, Coprecipitation, Co2 decomposition, Powder Characterization