Effects of metallic cobalt crystal phase on catalytic activity of cobalt catalysts supported on carbon nanotubes in Fischer–Tropsch synthesis

IF 2.1 4区 化学 Q3 CHEMISTRY, PHYSICAL Progress in Reaction Kinetics and Mechanism Pub Date : 2019-07-25 DOI:10.1177/1468678319862438
A. N. Pour, M. Housaindokht
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引用次数: 11

Abstract

The effects of metallic cobalt crystal phase on catalytic activity of cobalt catalysts in the Fischer–Tropsch synthesis were investigated in a continuous spinning basket reactor. The cobalt catalysts were prepared by impregnation of the cobalt active phase in a microemulsion system on multiwall carbon nanotube supports. A series of cobalt catalysts with different Co particle sizes was prepared by variation of the water-to-surfactant molar ratio from 2 to 12 in the microemulsion system. The X-ray diffraction results validate a complex composition of cobalt phases containing cobalt oxides and metallic cobalt with hexagonal close-packed and face-centered cubic phases. The results show that larger cobalt particles exhibit more face-centered cubic and less hexagonal close-packed metallic cobalt. The experimental results show that the catalysts with higher fractions of hexagonal close-packed phase exhibited higher conversion in the Fischer–Tropsch reaction.
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金属钴晶相对碳纳米管负载钴催化剂催化活性的影响
在连续纺丝篮反应器中研究了金属钴晶相对费托合成中钴催化剂催化活性的影响。在多壁碳纳米管载体上采用微乳液体系浸渍钴活性相制备钴催化剂。在微乳液体系中,通过水与表面活性剂的摩尔比从2到12的变化,制备了一系列不同粒径的钴催化剂。x射线衍射结果证实了钴相的复杂组成,其中含有钴氧化物和金属钴,具有六方紧密堆积的面心立方相。结果表明,较大的钴颗粒呈现出较多的面心立方型和较少的六边形紧密堆积型金属钴。实验结果表明,六方紧密堆积相分数越高的催化剂在费托反应中转化率越高。
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来源期刊
CiteScore
2.10
自引率
0.00%
发文量
5
审稿时长
2.3 months
期刊介绍: The journal covers the fields of kinetics and mechanisms of chemical processes in the gas phase and solution of both simple and complex systems.
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