Chlorination Kinetics of ZnFe_2O_4 with Ar-Cl_2-O_2 Gas

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Chlorination rate of ZnFe<SUB>2</SUB>O<SUB>4</SUB> with Ar-Cl<SUB>2</SUB>-O<SUB>2</SUB> gas was measured at 1023 to 1123 K by gravimetry. The effects of temperature, partial pressures of chlorine and oxygen on the rate were investigated. Zinc oxide contained in ZnFe<SUB>2</SUB>O<SUB>4</SUB> specimen was selectively chlorinated and evaporated in gas, while iron oxide remained as oxide in a chlorinated residue. Chlorination rate increased with increasing partial pressure of chlorine. On the other hand, chlorination rate slightly decreased with increasing partial pressure of oxygen and chlorination of iron oxide was prevented. Since the order of chlorination rate with respect to partial pressure of chlorine was approximately 0.5, the rate-determining step of chlorination is considered to be the dissociative adsorption of chlorine gas on the surface of solid ZnFe<SUB>2</SUB>O<SUB>4</SUB>. Decrease of chlorination rate with the increase of partial pressure of oxygen could be explained by the occupation of adsorption sites of chlorine atoms by oxygen and the chlorination rate was expressed as functions of partial pressures of chlorine and oxygen as r=k·(P_Cl<SUB>2</SUB>^1/2/1+K_OP_O<SUB>2</SUB>^1/2) The activation energy of chlorination was 35.1±2.2 kJ/mol which is relatively small compared to that of ZnO chlorination reaction (58.2 kJ/mol). It is considered that this low activation energy is due to the weak adsorption of chlorine atom on the adsorption site.

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  • Materials transactions  

    Materials transactions 47(10), 2524-2532, 2006-10-20 

    The Japan Institute of Metals and Materials

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各種コード

  • NII論文ID(NAID)
    10018310304
  • NII書誌ID(NCID)
    AA1151294X
  • 本文言語コード
    ENG
  • 資料種別
    ART
  • ISSN
    13459678
  • NDL 記事登録ID
    8092107
  • NDL 雑誌分類
    ZP41(科学技術--金属工学・鉱山工学)
  • NDL 請求記号
    Z53-J286
  • データ提供元
    CJP書誌  NDL  J-STAGE 
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