Synthesis and characterization of multiwall carbon nanotubes/alumina nanohybrid-supported cobalt catalyst in Fischer-Tropsch synthesis

能源化学(英文) ›› 2013, Vol. 22 ›› Issue (4): 582-590.

Synthesis and characterization of multiwall carbon nanotubes/alumina nanohybrid-supported cobalt catalyst in Fischer-Tropsch synthesis

Ali Karimi^a,b, Bahram Nasernejad^a*, Ali Morad Rashidi^b

a. Chemical Engineering Department, Amir Kabir University of Technology, Tehran 15875-4413, Iran;
b. Nanotechnology Research Center, Research Institute of Petroleum Industry, Tehran, P.O. Box 14665-1998, Iran

收稿日期:2012-06-11 修回日期:2012-07-30 出版日期:2013-07-20 发布日期:2013-07-27
通讯作者: Bahram Nasernejad
基金资助:
This work was supported by the Research Council of the Research Institute of Petroleum Industry and the Research and Development of the National Iranian Oil Company.

Synthesis and characterization of multiwall carbon nanotubes/alumina nanohybrid-supported cobalt catalyst in Fischer-Tropsch synthesis

Ali Karimi^a,b, Bahram Nasernejad^a*, Ali Morad Rashidi^b

a. Chemical Engineering Department, Amir Kabir University of Technology, Tehran 15875-4413, Iran;
b. Nanotechnology Research Center, Research Institute of Petroleum Industry, Tehran, P.O. Box 14665-1998, Iran

Received:2012-06-11 Revised:2012-07-30 Online:2013-07-20 Published:2013-07-27
Supported by:
This work was supported by the Research Council of the Research Institute of Petroleum Industry and the Research and Development of the National Iranian Oil Company.

摘要/Abstract

摘要： Multiwall carbon nanotubes (MWNTs) and alumina are combined to give a new type of nanohybrid for Fisher-Tropsch synthesis (FTS) catalyst support. Alumina nano-particles (10 wt%) were introduced directly on functionalized MWNTs by a modified sol-gel method. Microstructure observations show that alumina particles were homogeneously dispersed on the inside and outside of modified MWNTs surfaces. 15 wt% cobalt loading catalysts were prepared with this nanohybrid and γ-alumina as a reference, using a sol-gel technique and wet impregnation method respectively. These catalysts were characterized by TEM, XRD, N₂-adsorption, H₂ chemisorption and TPR. The deposition of cobalt nanoparticles synthesized by sol-gel technique on the MWNTs nanohybrid shift the reduction peaks to a low temperature, indicating higher reducibility for uniform cobalt particles. Nanohybrid also aided in high dispersion of metal clusters and high stability and performance of catalyst. The proposed MWNTs nanohybrid-supported cobalt catalysts showed the improved FTS rate (g_HC/(g_cat·min)), CO conversion (%), and water gas shift rate (WGS)(g_CO₂/(g_cat·h)) of 0.012, 52, and 30E-3, respectively, as compared to those of 0.007, 25, and 18E-3, respectively, on the γ-alumina-supported cobalt catalysts with the same Co loading.

关键词: carbon nanotubes, nanohybrid, cobalt catalyst, alumina, FT synthesis, sol-gel

Abstract: Multiwall carbon nanotubes (MWNTs) and alumina are combined to give a new type of nanohybrid for Fisher-Tropsch synthesis (FTS) catalyst support. Alumina nano-particles (10 wt%) were introduced directly on functionalized MWNTs by a modified sol-gel method. Microstructure observations show that alumina particles were homogeneously dispersed on the inside and outside of modified MWNTs surfaces. 15 wt% cobalt loading catalysts were prepared with this nanohybrid and γ-alumina as a reference, using a sol-gel technique and wet impregnation method respectively. These catalysts were characterized by TEM, XRD, N₂-adsorption, H₂ chemisorption and TPR. The deposition of cobalt nanoparticles synthesized by sol-gel technique on the MWNTs nanohybrid shift the reduction peaks to a low temperature, indicating higher reducibility for uniform cobalt particles. Nanohybrid also aided in high dispersion of metal clusters and high stability and performance of catalyst. The proposed MWNTs nanohybrid-supported cobalt catalysts showed the improved FTS rate (g_HC/(g_cat·min)), CO conversion (%), and water gas shift rate (WGS)(g_CO₂/(g_cat·h)) of 0.012, 52, and 30E-3, respectively, as compared to those of 0.007, 25, and 18E-3, respectively, on the γ-alumina-supported cobalt catalysts with the same Co loading.

Key words: carbon nanotubes, nanohybrid, cobalt catalyst, alumina, FT synthesis, sol-gel

Ali Karimi, Bahram Nasernejad, Ali Morad Rashidi. Synthesis and characterization of multiwall carbon nanotubes/alumina nanohybrid-supported cobalt catalyst in Fischer-Tropsch synthesis[J]. 能源化学(英文), 2013, 22(4): 582-590.

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Synthesis and characterization of multiwall carbon nanotubes/alumina nanohybrid-supported cobalt catalyst in Fischer-Tropsch synthesis

Synthesis and characterization of multiwall carbon nanotubes/alumina nanohybrid-supported cobalt catalyst in Fischer-Tropsch synthesis

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