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Effect of vacuum impregnation on the performance of Co/SiO_2 Fischer-Tropsch catalyst 被引量:1
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作者 Xiaofeng Zhou qingling chen +1 位作者 Yuewu Tao Huixin Weng 《Journal of Natural Gas Chemistry》 EI CAS CSCD 2011年第4期350-355,共6页
Two silica-supported cobalt catalysts were prepared by incipient wetness impregnation under atmospheric and vacuum conditions.N2 ph- ysisorption,H2 chemisorption,XRD,SEM,TEM,XPS and H2-TPR were used to characterize th... Two silica-supported cobalt catalysts were prepared by incipient wetness impregnation under atmospheric and vacuum conditions.N2 ph- ysisorption,H2 chemisorption,XRD,SEM,TEM,XPS and H2-TPR were used to characterize the catalysts.The results showed that the impregnation methods had an effect on the size,dispersion and reducibility of cobalt particles.Under vacuum conditions,cobalt-containing steeping liquor could penetrate into the inner pores of silica support and more bivalent cobalt oxides were formed in the Co3O4 crystallites.Furthermore,cobalt precursors were rarely inclined to agglomerate and the smaller cobalt particles were uniform on the support,which led to the higher activity of the Co/SiO2(B)catalyst than the normal one under the reaction conditions of 483- 523 K,1 - 2 MPa,gas hourly space velocity of 500–1000 h-1 and molar ratio of H2/CO=0.5 - 2.0. 展开更多
关键词 Fischer-Tropsch synthesis cobalt catalysts SILICA vacuum impregnation
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Correlation between hydrocarbon distribution and water-hydrocarbon ratio in Fischer-Tropsch synthesis
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作者 Xiaofeng Zhou qingling chen +1 位作者 Yuewu Yao Huixin Weng 《Journal of Natural Gas Chemistry》 EI CAS CSCD 2011年第5期525-530,共6页
In order to shorten the evaluation cycle of cobalt catalyst before the optimized catalyst is fixed on, a mathematical method is proposed to calculate weight percentage of C5+ hydrocarbons. Based on the carbide polyme... In order to shorten the evaluation cycle of cobalt catalyst before the optimized catalyst is fixed on, a mathematical method is proposed to calculate weight percentage of C5+ hydrocarbons. Based on the carbide polymerization mechanism and the main hydrocarbons being linear alkanes and α-olefins, the correlation between hydrocarbon distribution and the molecular mass ratio of water to hydrocarbons is discussed. The result shows the ratio was within the range of 1.125-1.286 and the lower the ratio, the more gaseous hydrocarbons were obtained. Moreover, a linear equation between the weight percentage of C5+ hydrocarbons and the weight ratio of C5+ hydrocarbons to the total water is established. These results are validated by corresponding experiments. The weight percentage of C5+ hydrocarbons could be immediately calculated by this linear equation without detailed gas chromatography (GC) analysis of them. 展开更多
关键词 Fischer-Tropsch synthesis cobalt catalyst water-hydrocarbon weight ratio hydrocarbon distribution
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