Preparation of Cobalt Nanoparticles in the Gas Phase (I): Kinetics of Cobalt Dichloride Reduction

Hee Dong Jang; Dae Won Hwang; Dong Pyo Kim; Heon Chang Kim; Byung Yoon Lee; In Bum Jeong

Journal of Industrial and Engineering Chemistry, Vol.9, No.4, 407-411, October, 2003

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Preparation of Cobalt Nanoparticles in the Gas Phase (I): Kinetics of Cobalt Dichloride Reduction

Hee Dong Jang^†, Dae Won Hwang¹, Dong Pyo Kim¹, Heon Chang Kim², Byung Yoon Lee³, and In Bum Jeong³

Nano-Materials Group, Korea Institute of Geoscience and Mineral Resources, Daejeon 305-350, Korea
¹Department of Fine Chemical Engineerin and Chemistry, Chungnam National University, Daejeon 305-764, Korea
²Department of Chemical Engineering, Hoseo University, Asan 336-795, Korea
³R/D center, Chang Sung Co., Incheon 405-100, Korea

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The reduction rate of cobalt dichloride (CoCl2) vapor by hydrogen (H2) in the gas phase was determined in the temperature range of 800 ℃ and 950 ℃ for the synthesis of cobalt (Co) nanoparticles in a tubular aerosol flow reactor. To determine the rate coefficient of the reaction, reaction zone temperature, initial CoCl2 concentration and CoCl2-to-H2 ratio were systematically varied. Assuming the Arrhenius form, the reaction rate was found, from chemical titration, to be first order with respect to the concentration Of CoCl2 in the employed process conditions. The activation energy for the reaction was 110.27 kJ/mol and preexponential factor 1.50 X 10(7) min(-1). The produced cobalt nanoparticles were smaller than 100 nm in average particle diameter, and their structures were cubic crystals.

Keywords:kinetics;cobalt dichloride;reduction;gas phase

[References]

Siegel RW, Annu. Rev. Mater. Sci., 21, 559 (1991)
Feldheim DL, Foss CA, Metal Nanoparticles: Synthesis, Characterization, and Application, Marcel Dekker, New York, 21 (2002)
Hoeppener S, Maoz R, Cohen SR, Chi LF, Fuchs H, Sagiv J, Adv. Mater., 14, 1036 (2002)
Kodas TT, Hampden-Smith MJ, Aerosol Processing of Materals, Wiley-VCH, New York, 293 (1999)
Saeki Y, Matsuzaki R, Nishihara H, Aoyama N, Denki Kagaku, 46, 643 (1978)
Otsuka K, Yamamoto H, Yoshizawa A, Jpn. J. Chem., 6, 869 (1984)
Park KY, Jang HD, Kim W, HWAHAK KONGHAK, 32(1), 79 (1994)
Rigg T, Can. J. Chem. Eng., 51, 714 (1973)
Vorobev NI, Pechkovskii VV, Lopania NG, Chem. Abstr., 66, 59279 (1967)
Saeki Y, Matsuzaki R, Aoyama N, J. Less-Common Metals, 55, 289 (1977)
Pankrats LB, Sture JM, Gokcen NA, Thermodynamics Data for Mineral Technology, U.S. Bureau of Mines Bulletin, 677 (1984)
Pratsinis SE, Bai H, Biswas P, J. Am. Ceram. Soc., 73, 2158 (1990)
Powers DR, J. Am. Ceram. Soc., 61, 295 (1978)
Kim SB, Cha WS, Hong SC, J. Ind. Eng. Chem., 8(2), 162 (2002)

[Referenced By]

[Related Articles]

[1] Siegel RW, Annu. Rev. Mater. Sci., 21, 559 (1991)

[2] Feldheim DL, Foss CA, Metal Nanoparticles: Synthesis, Characterization, and Application, Marcel Dekker, New York, 21 (2002)

[3] Hoeppener S, Maoz R, Cohen SR, Chi LF, Fuchs H, Sagiv J, Adv. Mater., 14, 1036 (2002)

[4] Kodas TT, Hampden-Smith MJ, Aerosol Processing of Materals, Wiley-VCH, New York, 293 (1999)

[5] Saeki Y, Matsuzaki R, Nishihara H, Aoyama N, Denki Kagaku, 46, 643 (1978)

[6] Otsuka K, Yamamoto H, Yoshizawa A, Jpn. J. Chem., 6, 869 (1984)

[7] Park KY, Jang HD, Kim W, HWAHAK KONGHAK, 32(1), 79 (1994)

[8] Rigg T, Can. J. Chem. Eng., 51, 714 (1973)

[9] Vorobev NI, Pechkovskii VV, Lopania NG, Chem. Abstr., 66, 59279 (1967)

[10] Saeki Y, Matsuzaki R, Aoyama N, J. Less-Common Metals, 55, 289 (1977)

[11] Pankrats LB, Sture JM, Gokcen NA, Thermodynamics Data for Mineral Technology, U.S. Bureau of Mines Bulletin, 677 (1984)

[12] Pratsinis SE, Bai H, Biswas P, J. Am. Ceram. Soc., 73, 2158 (1990)

[13] Powers DR, J. Am. Ceram. Soc., 61, 295 (1978)

[14] Kim SB, Cha WS, Hong SC, J. Ind. Eng. Chem., 8(2), 162 (2002)