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Journal of Central South University of Technology

, Volume 11, Issue 4, pp 414–418 | Cite as

Effect of cobalt loading on reducibility, dispersion and crystallite size of Co/Al2O3 fischer-tropsch catalyst

  • Xiong Hai-feng 
  • Zhang Yu-hua 
  • Li Jin-lin Email author
  • Gu Ying-ying 
Article

Abstract

Co/Al2O3 Fischer-Tropsch synthesis catalysts with different cobalt loadings were prepared using incipient wetness impregnation method. The effects of cobalt loading on the properties of catalysts were studied by means of X-ray diffraction (XRD), temperature programmed reduction (TPR), hydrogen temperature programmed desorption (H2-TPD) and O2 titration. Co-support compound formation can be detected in catalyst system by XRD. For the Co/Al2O3 catalysts with low cobalt loading, CoAl2O4 phase appears visibly. Two different reduction regions can be presented for Co/Al2O3 catalysts, which belong to Co3O4 crystallites (reduction at 320°C) and cobalt oxidetallite size. The reduced Co/Al2O3 catalysts have two adsorption sites, and cobalt loading greatly influences the adsorption behavior. With the increase of cobalt loading, the amount of low temperature adsorption is increased, the amount of high temperature adsorption is decreased, and the percentage reduction and cobalt crystallite size are increased.

Key words

Fischer-Tropsch synthesis cobalt/alumina catalyst temperature programmed reduction hydrogen temperature programmed desorption 

CLC number

O 643.3 

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References

  1. [1]
    LI J L, Coville N J. Effect of boron on the sulfur poisoning of Co/TiO2 Fischer-Tropsch catalysts[J]. Applied Catalysis A: General, 2001, 208(1): 177–184.Google Scholar
  2. [2]
    Andenson R B. The Fischer-Tropsch Synthesis[M]. Orlando: Academic Press, 1984.Google Scholar
  3. [3]
    YING Dong-hong, LI Wen-huai, ZHONG Bing, et al. Preparation of cobalt catalysts supported on mesoporous molecular sieves and their catalytic performance for Fischer-Tropsch synthesis[J]. Chinese Journal of Catalysis, 2000, 21(3): 221–224. (in Chinese)Google Scholar
  4. [4]
    LI J L, Coville N J. The effect of boron on the catalyst reducibility and activity of Co/TiO2 Fischer-Tropsch catalysts[J]. Applied Catalysis A: General, 1999, 181 (1): 201–208.Google Scholar
  5. [5]
    Ali S, Chen B, Goodwin J G Jr. Zr promotion of Co/SiO2 for Fischer-Tropsch synthesis[J]. Journal of Catalysis, 1995, 157(1): 35–41.Google Scholar
  6. [6]
    Andreas F, Michael C, van Steen E. Cobalt cluster effects in zirconium promoted Co/SiO2 Fischer-Tropsch catalysts [J]. Journal of Catalysis, 1999, 185(1): 120–130.Google Scholar
  7. [7]
    Kogekbauer A, Goodwin J G, Oukaci R J. Ruthenium promotion of Co/Al2O3 Fischer-Tropsch catalysts[J]. Journal of Catalysis, 1996, 160(1): 125–133.Google Scholar
  8. [8]
    Voβ M, Borgmann D, Wedler G. Characterization of alumina, silica, and titania supported cobalt catalysts [J]. Journal of Catalysis, 2002, 212(1): 10–21.Google Scholar
  9. [9]
    Schanke D, Vada S, Blekkan E A, et al. Study of Pt-promoted promoted cobalt CO hydrogenation catalysts[J]. Journal of Catalysis, 1995, 156(1): 85–95.Google Scholar
  10. [10]
    Rohr F, Lindvaj O A, Holemen A, et al. Fischer-Tropsch synthesis over cobalt catalysts supported on zirconia-modified alumina [J]. Catalysis Today, 2000, 58(4): 247–254.Google Scholar
  11. [11]
    Blik H V, Prins R. Characterization of supported cobalt and cobalt-rhodium catalysts[J]. Journal of Catalysis, 1986, 97(1): 188–199.Google Scholar
  12. [12]
    Khassin A A, Yurieva T M, Kustova G N, et al. Cobalt-aluminum co-precipitated catalysts and their performance in the Fischer-Tropsch synthesis[J]. Journal of Molecular Catalysis A: Chemical, 2001, 168 (1–2): 193–207.Google Scholar
  13. [13]
    Arnoldy P, Moulijn J A. Temperature-programmed reduction of CoO/Al2O3 catalysts[J]. Journal of Catalysis, 1985, 93(1): 38–54.Google Scholar
  14. [14]
    Khassin A A, Yurieva T M, Kaichev V V, et al. Metal-support interactions in cobalt-aluminum coprecipitated catalysts: XPS and CO adsorption studies [J]. Journal of Molecular Catalysis A: Chemical, 2001, 175(1): 189–204.Google Scholar
  15. [15]
    Jongsomjit B, Panpranot J, Goodwin J G Jr. Cosupport compound formation in alumina-supported cobalt catalysts [J]. Journal of Catalysis, 2001, 204 (1): 98–109.Google Scholar
  16. [16]
    Jongsomjit B, Panpranot J, Goodwin J G Jr. Effect of zirconia-modified alumina on the properties of Co/γ-Al2O3 catalysts[J]. Journal of Catalysis, 2003, 215(1), 66–77.Google Scholar
  17. [17]
    WANG Wei-jye, CHEN Yu-wen. Influence of metal loading on the reducibility and hydrogenation activity of cobalt/alumina catalysts[J]. Applied Catalysis A: General, 1991, 77(2): 223–233.Google Scholar
  18. [18]
    Jacobs G, Das T, ZHANG Y Q, et al. Fischer-Tropsch synthesis: support, loading, and promoter effects on the reducibility of cobalt catalysts[J]. Applied Cata-lysis A: General, 2002, 233(2): 263–281.Google Scholar
  19. [19]
    Lapidus A, Krylova A, Kazanskii V, et al. Hydrocarbon synthesis from carbon monoxide and hydrogen on impregnated cobalt catalysts[J]. Applied Catalysis A: General, 1991, 73(1): 65–82.Google Scholar
  20. [20]
    MENG Ming, LIN Pei-yan, FU Yi-lu. A study of pulse adsorption and temperature-programmed heating on Co-Pt(Pd,Rh)/γ-Al2O3 catalysts[J]. Journal of Molecular Catalysis, 1997, 11(5): 325–331. (in Chinese)Google Scholar
  21. [21]
    ZHANG Jun-ling, CHEN Jian-gang, REN Jie, et al. Chemical treatment of γ-Al2O3 and its influence on the properties of Co-based catalysts for Fischer-Tropsch synthesis[J]. Applied Catalysis A: General, 2003, 243 (1): 121–133.Google Scholar
  22. [22]
    Hilmen A M, Schanke D, Hanssen K F, et al. Study of the effect of water on alumina supported cobalt Fischer-Tropsch catalysts [J]. Applied Catalysis A: General, 1999, 186(1): 169–188.Google Scholar

Copyright information

© Central South University 2004

Authors and Affiliations

  • Xiong Hai-feng 
    • 1
  • Zhang Yu-hua 
    • 1
  • Li Jin-lin 
    • 1
    Email author
  • Gu Ying-ying 
    • 2
  1. 1.School of Chemistry and Life ScienceSouth Central University for NationalitiesWuhanChina
  2. 2.School of Chemistry and Chemical EngineeringCentral South UniversityChangshaChina

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