Low‐temperature Fischer‐Tropsch synthesis using plasma‐synthesized nanometric Co/C and Fe/C catalysts

Aluha, James; Braidy, Nadi; Dalai, Ajay K.; Abatzoglou, Nicolas

doi:10.1002/cjce.22537

Cited by 18 publications

(55 citation statements)

References 27 publications

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“…%). Metal nanoparticle-size analysis by TEM imaging manifested a mean size of about 11.0 nm (counting 750 particles) before and after the reaction [7], as portrayed in Figure 2. This observation alluded to the absence of nanoparticle agglomeration in the spent catalyst sample after a 24-h reduction at 400 • C followed by another 24 h of FTS reaction.…”

Section: Microscopy: Elemental and Particle Size Analysismentioning

confidence: 99%

“…In addition, the microscopic properties of the catalyst were revealed by Transmission electron microscopy (TEM) as well as with Scanning electron microscopy (SEM) coupled with the Energy dispersive X-ray spectroscopy (EDX). Since the details of this catalyst's properties are available in earlier work [7], the results are summarized here for the benefit of the reader.…”

Section: Catalyst Characterizationmentioning

confidence: 99%

“…It has been observed that certain desirable properties of the C support can easily be activated, enhanced or varied by functionalization using either basic or acidic media [6]. In fact, the very presence of carbon as a support does not seem to negatively influence the performance of the nanometric carbon-supported catalysts that were synthesized through plasma [7]. In the recent past, great interest has been stimulated in catalyst preparation by various plasma technologies because plasma produces materials that have improved LT-FTS activity, enhanced stability, and have better anti-carbon deposition performance [8].…”

Section: Introductionmentioning

confidence: 99%

“…Interest in a Biomass to Liquid process via Fischer-Tropsch (BTL-FT) synthesis is growing steadily from both academia and industry because of its ability to produce carbon neutral and environmentally friendly clean fuels [12]. Commercial production of such fuels while simultaneously satisfying the increasing energy demand and meeting stringent environmental regulations is inevitable in the foreseeable future, particularly with the push towards sulphur-free diesel [13]. The world today is therefore bracing itself for compliance in automobile fuel production; to shift away from fossil fuels towards renewable sources of energy such as biomass.…”

Section: Introductionmentioning

confidence: 99%

“…Since the previous publication on the single-metal Co/C was centred on catalyst synthesis, characterization and benchmarking with the commercially available Fe-NanoCat ® catalyst [7], one of the limitation in determining the true α-value of the catalyst was due to the reactor set-up. The plasma-synthesized Co/C was tested in a closed 3-φ-CSTSR for FTS.…”

Section: Introductionmentioning

confidence: 99%

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Effect of CO Concentration on the α-Value of Plasma-Synthesized Co/C Catalyst in Fischer-Tropsch Synthesis

Aluha

Abatzoglou

2017

Catalysts

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Abstract:A plasma-synthesized cobalt catalyst supported on carbon (Co/C) was tested for Fischer-Tropsch synthesis (FTS) in a 3-phase continuously-stirred tank slurry reactor (3-φ-CSTSR) operated isothermally at 220 • C (493 K), and 2 MPa pressure. Initial syngas feed stream of H 2 :CO ratio = 2 with molar composition of 0.6 L/L (60 vol %) H 2 and 0.3 L/L (30 vol %) CO, balanced in 0.1 L/L (10 vol %) Ar was used, flowing at hourly space velocity (GHSV) of 3600 cm 3 ·h −1 ·g −1 of catalyst. Similarly, other syngas feed compositions of H 2 :CO ratio = 1.5 and 1.0 were used. Results showed~40% CO conversion with early catalyst selectivity inclined towards formation of gasoline (C 4 -C 12 ) and diesel (C 13 -C 20 ) fractions. With prolonged time-on-stream (TOS), catalyst selectivity escalated towards the heavier molecular-weight fractions such as waxes (C 21+ ). The catalyst's α-value, which signifies the probability of the hydrocarbon-chain growth was empirically determined to be in the range of 0.85-0.87 (at H 2 :CO ratio = 2), demonstrating prevalence of the hydrocarbon-chain propagation, with particular predisposition for wax production. The inhibiting CO effect towards FTS was noted at molar H 2 :CO ratio of 1.0 and 1.5, giving only~10% and~20% CO conversion respectively, although with a high α-value of 0.93 in both cases, which showed predominant production of the heavier molecular weight fractions.

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Section: Microscopy: Elemental and Particle Size Analysismentioning

confidence: 99%

Section: Catalyst Characterizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effect of CO Concentration on the α-Value of Plasma-Synthesized Co/C Catalyst in Fischer-Tropsch Synthesis

Aluha

Abatzoglou

2017

Catalysts

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Co‐doped ZnO thin films grown by pulsed electron beam ablation as model nano‐catalysts in fischer‐tropsch synthesis

et al. 2018

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A single-step deposition of cobalt-doped zinc oxide (Co-ZnO) thin film nano-composites on three different crystalline substrates, viz., Al 2 O 3 (c-sapphire), silicon (100) (Si), and SiO 2 (quartz) is reported, using pulsed electron beam ablation (PEBA). The results indicate that the type of substrate has no effect on Co-ZnO films stoichiometry, morphology, microstructure, and film thickness. The findings show the presence of hexagonal close-packed metallic Co whose content increases in the films deposited on Al 2 O 3 and Si substrates relatively to SiO 2 substrate. The potential of the films as model nano-catalysts has been evaluated in the context of the Fischer-Tropsch (FT) process. Fuel fractions, which have been observed in FT liquid products, are rich in diesel and waxes. Specifically, Co-ZnO/Al 2 O 3 nano-catalyst shows a selectivity of 4%, 31%, and 65% towards gasoline, diesel, and waxes, respectively, while Co-ZnO/SiO 2 nano-catalyst shows a selectivity of 12%, 51%, and 37%, for gasoline, diesel, and waxes, respectively.

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Activation and deactivation scenarios in a plasma‐synthesized Co/C catalyst for Fischer‐Tropsch synthesis

Aluha

Abatzoglou

2018

Can J Chem Eng

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A carbon‐supported cobalt nano‐catalyst (Co/C) synthesized through plasma was tested for Fischer‐Tropsch activity. Catalyst deactivation and activation protocols studied included in situ sample pre‐treatment at 673 K in gas flowing at the rate of 250 cm3 · min−1 in: (a) H2 only, (b) CO only, and (c) CO followed by H2, with each cycle lasting 24 h. The so‐treated catalyst samples were then tested for FTS activity for over 50 h of time‐on‐stream (TOS), at 2.2 MPa pressure and 493 or 518 K temperature in a 3‐phase continuously‐stirred tank slurry reactor (3‐φ‐CSTSR) using squalane (C30H62) as the carrier liquid phase. The feed gas composition of molar H2:CO = 1.7 comprising 50 % H2, 30 % CO, and 10 % CO2 balanced in Ar for mass balance determination, flowing at a gas hourly space velocity (GHSV) of 3360 cm3 · h−1 · g−1 of catalyst. Fresh catalysts and those reduced by CO‐only were completely inactive at 493 K and initial inactivity was attributed to the excessive C matrix formed around the metal nanoparticles during catalyst synthesis. The sample that was reduced by H2 only was the most active, although it showed the fastest declining activity due to cumulative high H2O vapour pressure in the FTS reactor, while the sample pre‐treated in both CO and H2 demonstrated a higher degree of stability with TOS.

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Low‐temperature Fischer‐Tropsch synthesis using plasma‐synthesized nanometric Co/C and Fe/C catalysts

Cited by 18 publications

References 27 publications

Effect of CO Concentration on the α-Value of Plasma-Synthesized Co/C Catalyst in Fischer-Tropsch Synthesis

Effect of CO Concentration on the α-Value of Plasma-Synthesized Co/C Catalyst in Fischer-Tropsch Synthesis

Co‐doped ZnO thin films grown by pulsed electron beam ablation as model nano‐catalysts in fischer‐tropsch synthesis

Activation and deactivation scenarios in a plasma‐synthesized Co/C catalyst for Fischer‐Tropsch synthesis

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