Effect of catalyst confinement and pore size on Fischer-Tropsch synthesis over cobalt supported on carbon nanotubes  

作　　者：XIE Wei ZHANG YuHua LIEW KongYong LI JinLin 

机构地区：[1]Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission&Ministry of Education,South-Central University for Nationalities,Wuhan 430074,China [2]School of Chemistry and Chemical Engineering,Soochow University,Suzhou 215123,China [3]Faculty of Industrial Science and Technology,University Malaysia Pahang,Kuantan,Malaysia

出　　处：《Science China Chemistry》2012年第9期1811-1818,共8页中国科学（化学英文版）

基　　金：the support from the National Natural Science Foundation of China (21073238);the National Basic Research Program of China(2011CB211704);the Natural Science Foundation of Hubei Province(2009CDA049)

摘　　要：This paper studies the impact of structure of cobalt catalysts supported on carbon nanotubes(CNT) on the activity and product selectivity of Fischer-Tropsch synthesis(FTS) reaction.Three types of CNT with average pore sizes of 5,11,and 17 nm were used as the supports.The catalysts were prepared by selectively impregnating cobalt nanoparticles either inside or outside CNT.The TPR results indicated that the catalyst with Co particles inside CNT was easier to be reduced than those outside CNT,and the reducibility of cobalt oxide particles inside the CNT decreased with the cobalt oxide particle size increasing.The activity of the catalyst with Co inside CNT was higher than that of catalysts with Co particles outside CNT.Smaller CNT pore size also appears to enhance the catalyst reduction and FTS activity due to the little interaction between cobalt oxide with carbon and the enhanced electron shift on the non-planar carbon tube surface.This paper studies the impact of structure of cobalt catalysts supported on carbon nanotubes （CNT） on the activity and product selectivity of Fischer-Tropsch synthesis （FTS） reaction. Three types of CNT with average pore sizes of 5, 11, and 17 nm were used as the supports. The catalysts were prepared by selectively impregnating cobalt nanoparticles either inside or outside CNT The TPR results indicated that the catalyst with Co particles inside CNT was easier to be reduced than those outside CNT, and the reducibility of cobalt oxide particles inside the CNT decreased with the cobalt oxide particle size increasing. The activity of the catalyst with Co inside CNT was higher than that of catalysts with Co particles outside CNT. Smaller CNT pore size also appears to enhance the catalyst reduction and FTS activity due to the little interaction between cobalt oxide with carbon and the enhanced electron shift on the non-planar carbon tube surface.

关 键 词：carbon nanotube（CNT） cobalt catalyst CONFINEMENT pore size Fiseher-Tropsch synthesis 

分 类 号：TQ529.2[化学工程—煤化学工程] TB383[一般工业技术—材料科学与工程]