| Effect of cobalt loading on reducibility, dispersion and crystallite size of Co／Al2O3 Fischer-Tropsch catalyst |
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| 引用本文： | 熊海峰,张煜华,李金林,古映莹.Effect of cobalt loading on reducibility, dispersion and crystallite size of Co／Al2O3 Fischer-Tropsch catalyst[J].中南工业大学学报(英文版),2004,11(4):414-418. |
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| 作者姓名： | 熊海峰 张煜华 李金林 古映莹 |
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| 作者单位： | [1]SchoolofChemistryandLifeScience,SouthCentralUniversityforNationalities,Wuhan430074,China [2]SchoolofChemistryandChemicalEngineering,CentralSouthUniversity,Changsha410083,China |
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| 摘 要： | 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, CoAl2O3 phase appears visibly. Two different reduction regions can be presented for Co/Al2O3 catalysts, which belong to Co3 O4 crystallites (reduction at 320 ““C) and cobalt oxidealumina interaction species (reduction at above 400℃). Increasing Co loading results in the increase of Co3 O4 crystallite 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.
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| 关 键 词： | 费托合成 Co／Al2O3催化剂 温度还原 高温脱氢 分散性 |
| 收稿时间： | 14 February 2004 |
| 修稿时间： | 10 June 2004 |
Effect of cobalt loading on reducibility, dispersion and crystallite size of Co/Al2O3 fischer-tropsch catalyst |
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| Xiong Hai-feng , Zhang Yu-hua , Li Jin-lin and Gu Ying-ying.Effect of cobalt loading on reducibility, dispersion and crystallite size of Co/Al2O3 fischer-tropsch catalyst[J].Journal of Central South University of Technology,2004,11(4):414-418. |
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| Authors: | Xiong Hai-feng Zhang Yu-hua Li Jin-lin and Gu Ying-ying |
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| Affiliation: | (1) School of Chemistry and Life Science, South Central University for Nationalities, 430074 Wuhan, China;(2) School of Chemistry and Chemical Engineering, Central South University, 410083 Changsha, China |
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| 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.
Foundation item: Project (20373090) supported by the National Natural Science Foundation of China: project (2003 ABB013) supported by the
Talented Young Scientist Foundation of Hubei Province; project supported by the Excellent Young Teachers Program of Ministry
of Education of China; project supported by the State Ethnic Affairs Commission of China; project supported by the Returnee
Startup Scientific Research Foundation of Ministry of Education of China |
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| Keywords: | Fischer-Tropsch synthesis cobalt/alumina catalyst temperature programmed reduction hydrogen temperature programmed desorption |
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