2017
DOI: 10.1002/ente.201700060
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Carbon Nanotubes–MnOx Nanocomposite as Support for Iron‐Based Catalysts for the Fischer–Tropsch Synthesis of Liquid Fuels

Abstract: A facile one‐pot hydrothermal method is developed to synthesize a series of carbon nanotubes–manganese oxide nanocomposites (CNTs–MnOx) with different morphologies and Mn valence states. These nanocomposite materials are then utilized as catalyst supports in iron‐based Fischer–Tropsch synthesis (FTS) for the production of liquid fuels. Experimental results indicate that Fe/CNTs‐K‐190 (iron catalyst supported on the CNTs treated with KMnO4 at 190 °C) and Fe/CNTs‐KU‐190 (iron catalyst supported on the CNTs treat… Show more

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Cited by 5 publications
(7 citation statements)
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“…In comparison with that of NFM-4 (Figure S12), the NFM-3 catalyst displayed a weaker diffraction peak of metal oxide and a stronger peak of iron carbide (JCPDS 51-0997), revealing that the proper interaction between Fe and Mn could enhance the stability of carbide, which is generally considered as the main active phase for F–T synthesis . However, a new peak for the MnCO 3 phase (JCPDS 44-1472) was observed with a further increase of Mn content, which was possibly converted from MnO due to the intimate contact with CO 2 during the reaction, and it could be detrimental to the catalytic performance . Therefore, for the NFM catalyst with a higher Mn ratio, this phenomenon could partly account for the abrupt decrease of aromatic selectivity between 12 and 24 h (Figure b).…”
Section: Resultsmentioning
confidence: 65%
See 1 more Smart Citation
“…In comparison with that of NFM-4 (Figure S12), the NFM-3 catalyst displayed a weaker diffraction peak of metal oxide and a stronger peak of iron carbide (JCPDS 51-0997), revealing that the proper interaction between Fe and Mn could enhance the stability of carbide, which is generally considered as the main active phase for F–T synthesis . However, a new peak for the MnCO 3 phase (JCPDS 44-1472) was observed with a further increase of Mn content, which was possibly converted from MnO due to the intimate contact with CO 2 during the reaction, and it could be detrimental to the catalytic performance . Therefore, for the NFM catalyst with a higher Mn ratio, this phenomenon could partly account for the abrupt decrease of aromatic selectivity between 12 and 24 h (Figure b).…”
Section: Resultsmentioning
confidence: 65%
“…46 However, a new peak for the MnCO 3 phase (JCPDS 44-1472) was observed with a further increase of Mn content, which was possibly converted from MnO due to the intimate contact with CO 2 during the reaction, and it could be detrimental to the catalytic performance. 47 Therefore, for the NFM catalyst with a higher Mn ratio, this phenomenon could partly account for the abrupt decrease of aromatic selectivity between 12 and 24 h (Figure 1b).…”
Section: Optimizing Reactionmentioning
confidence: 96%
“…No doubt, MnO would be easily converted to MnCO 3 under these circumstances. From the viewpoint of catalytic performance, the reaction-induced formation of MnCO 3 in MnO-containing catalysts was considered to be both favorable and detrimental . A clear-cut decision of its catalytic action, inhibition, or spectatorship cannot be made at present and is certainly also dependent on the catalytic process under consideration.…”
Section: Resultsmentioning
confidence: 99%
“…36 Note that the formation of a carbonate on the MnO/Au(111) surface was observed after exposure to 10 mbar CO 2 even at room temperature. 34 Besides, MnCO 3 was reported to form, for instance, in FeO− MnO, 43 Co−MnO x , 44 and carbon nanotubes−MnO x nanocomposite 45 catalysts under reaction conditions of the longterm Fischer−Tropsch synthesis at 260−300 °C in a mixture of CO + H 2 . With all of these catalysts, a considerable water− gas shift activity was observed, possibly involving a formate/ carboxylate-derived complex with kinetic branching leading to either chain lengthening via hydrogenation or CO 2 spin-off.…”
Section: ■ Experimental Sectionmentioning
confidence: 99%
“…Reuel and Bartholomew found that the order of CO hydrogenation activity is Co/TiO 2 > Co/SiO 2 > Co/Al 2 O 3 > Co/C > Co/MgO. And Liu et al . reported that when carbon nanotube (CNT)–MnO x nanocomposite materials were used as supports in Fe‐based FTS catalysts for the production of liquid fuel, the Fe/CNTs–MnO x catalysts displayed higher FTS activity than either Fe/CNTs or Fe/Mn 2 O 3 .…”
Section: Introductionmentioning
confidence: 99%