Particle Size and Crystal Phase Effects in Fischer-Tropsch Catalysts

Liu, Jin‐Xun; Wang, Peng; Xu, Wayne Qiang; Hensen, Emiel J. M.

doi:10.1016/j.eng.2017.04.012

Cited by 103 publications

(73 citation statements)

References 91 publications

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“…As discussed in the introduction, the performance of FTS catalysts is related to parameters such as average Co particle size, composition, crystallographic structure, and H 2 uptake . Herein, we found that the CTY decreases with the increase of the average Co particle size (Figure a).…”

Section: Resultsmentioning

confidence: 53%

“…The 15 %Co/CNF catalyst shows the highest Co hcp /Co fcc ratio and reduction degree. This is explained by the fact that the reducibility and the crystalline phase depend on two parameters: i) the weak metal‐support interaction, which contributes to an increase of the reduction degree; and ii) the surface topology, which controls the exposed Co particles facets …”

Section: Resultsmentioning

confidence: 99%

“…This is explained by the fact that the reducibility and the crystalline phase depend on two parameters: i) the weak metal-support interaction, which contributes to 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 an increase of the reduction degree; [36] and ii) the surface topology, which controls the exposed Co particles facets. [41] Finally, we also performed XPS analyses to probe a possible charge transfer between the support and Co in the calcined catalysts. The XPS results, presented in Figure S2, and Table 2 and 3, were obtained by deconvolution of the XPS spectra of Co 2p, O 1s, and C 1s.…”

Section: Cobalt Particle Size Crystallographic Phase and Compositionmentioning

confidence: 99%

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Hydrogen Spillover in the Fischer‐Tropsch Synthesis on Carbon‐supported Cobalt Catalysts

et al. 2019

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The Fischer‐Tropsch reaction transforms syngas into high added value products, among which liquid fuels. Numerous parameters determine catalytic activity and selectivity towards the most desired hydrocarbons. The performances of cobalt‐based catalysts used in the reaction are known to depend critically on Co particle size and crystallographic phase. Here, we present a comparative study of Co‐based catalysts supported on three carbon supports: multi‐wall carbon nanotubes, carbon nanofibers and a fibrous material. Our results show that, while the selectivity towards C5+ follows the expected tendency with respect to Co particle size, this is not the case for the TOF. These results can be rationalized considering that the amount of H2 uptake on each catalyst increases with oxygen and defect concentration on the support. The catalyst on the support presenting many edges and oxygen surface groups, necessary for H2 spillover, presents the highest activity. Furthermore, the hydrogen spillover contributes to the enhancement of olefin hydrogenation and methane production.

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Section: Resultsmentioning

confidence: 53%

Section: Resultsmentioning

confidence: 99%

Section: Cobalt Particle Size Crystallographic Phase and Compositionmentioning

confidence: 99%

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Hydrogen Spillover in the Fischer‐Tropsch Synthesis on Carbon‐supported Cobalt Catalysts

et al. 2019

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“…Previous experimental work showed that FTS activity closely depends on the particle size of the active iron species. 23,46,49 In this work, the size of the Fe 5 C 2 crystals strongly depended on that of ZnFe 2 O 4 for the catalysts. When the pure Fe 1 Zn 1.2 O x was calcined at 400 C or lower, the crystalline size of Fe 5 C 2 for the spent catalysts became smaller than that of ZnFe 2 O 4 of the fresh catalysts (Table 1).…”

Section: Resultsmentioning

confidence: 56%

Linear α-olefin production with Na-promoted Fe–Zn catalysts via Fischer–Tropsch synthesis

et al. 2019

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“…Over decades, identifying the crystal structure sensitivity of catalysts in chemical reactions to accomplish maximum productivity remains one of the most significant yet challenging issues in heterogeneous catalysis . A notable example of such structure sensitivity is the Fischer–Tropsch synthesis (FTS) wherein, various in situ characterizations and theoretical calculations were conducted to understand the crystal structure sensitivity for cobalt, ruthenium, and iron catalysts . Apart from Fischer–Tropsch synthesis, several other chemical and electrochemical reactions wherein, the crystallographic phase of metal catalysts influence the catalytic processes have been investigated …”

Section: Introductionmentioning

confidence: 99%

Effect of the Crystallographic Phase of Ruthenium Nanosponges on Arene and Substituted‐Arene Hydrogenation Activity

Ghosh

Jagirdar

2018

ChemCatChem

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Identifying crystal structure sensitivity of a catalyst for a particular reaction is an important issue in heterogeneous catalysis. In this context, the activity of different phases of ruthenium catalysts for benzene hydrogenation has not yet been investigated. The synthesis of hcp and fcc phases of ruthenium nanosponges by chemical reduction method has been described. Reduction of ruthenium chloride using ammonia borane (AB) and tert‐butylamine borane (TBAB) as reducing agents gave ruthenium nanosponge in its hcp phase. On the other hand, reduction using sodium borohydride (SB) afforded ruthenium nanosponge in its fcc phase. The as prepared hcp ruthenium nanosponge was found to be catalytically more active compared to the as prepared fcc ruthenium nanosponge for hydrogenation of benzene. The hcp ruthenium nanosponge was found to be thermally stable and recyclable over several cycles. This self‐supported hcp ruthenium nanosponge shows excellent catalytic activity towards hydrogenation of various substituted benzenes. Moreover, the ruthenium nanosponge catalyst was found to bring about selective hydrogenation of aromatic cores of phenols and aryl ethers to the respective alicyclic products without hydrogenolysis of the C−O bond.

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Particle Size and Crystal Phase Effects in Fischer-Tropsch Catalysts

Cited by 103 publications

References 91 publications

Hydrogen Spillover in the Fischer‐Tropsch Synthesis on Carbon‐supported Cobalt Catalysts

Hydrogen Spillover in the Fischer‐Tropsch Synthesis on Carbon‐supported Cobalt Catalysts

Linear α-olefin production with Na-promoted Fe–Zn catalysts via Fischer–Tropsch synthesis

Effect of the Crystallographic Phase of Ruthenium Nanosponges on Arene and Substituted‐Arene Hydrogenation Activity

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