Catalytic Properties of Potassium- or Lanthanum-Promoted Co/γ-Al<sub>2</sub>O<sub>3</sub> Catalysts in Carbon Monoxide Hydrogenation

Jong-Ki Jeon; Chang-Jun Kim; Young-Kwon Park; Son-Ki Ihm

Korean Journal of Chemical Engineering, Vol.21, No.2, 365-369, March, 2004

DOI10.1007/BF02705421 Export Citation

Catalytic Properties of Potassium- or Lanthanum-Promoted Co/γ-Al₂O₃ Catalysts in Carbon Monoxide Hydrogenation

Jong-Ki Jeon , Chang-Jun Kim¹, Young-Kwon Park², and Son-Ki Ihm^{3, †}

Dept. of Chemical Engineering, Dongyang University, Youngjou 750-711, Korea
¹Dept. of Chemical Engineering, Gyeongsang National University, Chinju 660-701, Korea
²Faculty of Environmental Engineering, University of Seoul, Seoul 130-743, Korea
³Dept. of Chem. and Biomolecular Eng., KAIST, Daejeon 305-701, Korea

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The effects of potassium or lanthanum additives on the catalytic properties of alumina-supported cobalt catalysts were examined through carbon monoxide hydrogenation reaction. The catalysts were characterized by hydrogen or carbon monoxide chemisorption, oxygen titration, and temperature-programmed desorption. The reactions were carried out at 270 ℃ and atmospheric pressure. When a small amount of potassium was added to alumina-supported cobalt catalysts, the amount of hydrogen adsorption decreased more significantly than that of carbon monoxide adsorption, and the extent of reduction also decreased. With the addition of potassium, the overall carbon monoxide conversion decreased, while the selectivity to higher hydrocarbon and olefin increased. The effect of lanthanum on activity and selectivity in carbon monoxide hydrogenation was less significant than the effect of potassium. Temperature-programmed desorption showed that the presence of additives changed the adsorbed state of CO on cobalt.

Keywords:Cobalt;Alumina;Potassium;Lanthanum;Carbon Monoxide Hydrogenation

[References]

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[1] Barrault J, Guilleminot A, Appl. Catal., 21, 307 (1986)

[2] Bartholomew CH, Farrauto RJ, J. Catal., 45, 41 (1976)

[3] Chin RL, Hercules DM, J. Phys. Chem., 80, 360 (1982)

[4] Choi JG, Choi HK, Jung MK, Oh HG, Choi JO, J. Ind. Eng. Chem., 3(3), 235 (1997)

[5] Goldwasser J, Hall WK, J. Catal., 71, 53 (1981)

[6] Lee DK, Ahn JH, J. Korean Ind. Eng. Chem., 1(1), 100 (1990)

[7] Lee JH, Lee DK, Ihm SK, J. Catal., 113, 544 (1988)

[8] Lee PI, Schwarz JA, Heydweiller JC, Chem. Eng. Sci., 40, 509 (1985)

[9] Praliaud H, Dalmon JA, Mirodatos C, Martin GA, J. Catal., 97, 344 (1986)

[10] Gonzalez RD, Hirosch M, J. Catal., 77, 338 (1982)

[11] Reuel RC, Bartholomew CH, J. Catal., 85, 63 (1984)

[12] Rieck JS, Bell AT, J. Catal., 99, 278 (1986)

[13] Riedel T, Claeys M, Schulz H, Schaub G, Nam SS, Jun KW, Choi MJ, Kishan G, Lee KW, Appl. Catal. A: Gen., 186(1-2), 201 (1999)

[14] Shin HK, Nam IS, Lee JS, Chung JS, Moon SH, Korean J. Chem. Eng., 13(1), 54 (1996)

[15] Underwood RP, Bell AT, J. Catal., 109, 61 (1988)

[16] Wang C, Wang Q, Liu S, Xu L, "Effect of K/Fe Ratio on Light Olefins Selectivity in CO Hydrogenation on Iron Based Catalyst," Proceeding of 3rd Asia-Pacific Congress on Catalysis, Dalian, 454 (2003)

[17] Xu LY, Wang QX, Xu YD, Huang JS, Catal. Lett., 31(2-3), 253 (1995)

[18] Yoon KJ, Kim EJ, Korean J. Chem. Eng., 12(2), 221 (1995)

[19] Zhao H, Chen J, Sun Y, "Zirconiasupported Cobalt as a Catalyst for Fisher-Tropsch Synthesis," Proceeding of 3rd Asia-Pacific Congress on Catalysis, Dalian, 444 (2003)