Fischer–Tropsch synthesis over cobalt catalyst supported on carbon nanotubes in a slurry reactor

Tavasoli, Ahmad; Abbaslou, Reza M. Malek; Trépanier, Mariane; Dalai, Ajay K.

doi:10.1016/j.apcata.2008.04.030

Cited by 154 publications

(90 citation statements)

References 12 publications

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“…Carbon nanotubes (CNTs) with unique structure and properties such as well-defined hollow interiors, inert surface properties, and resistance to acid and base environment have been proven to be excellent candidates as support in catalytic reactions [1][2][3][4][5][6][7] and energy storage and conversion medium [8][9][10][11]. Structural parameters of CNTs such as inner diameter, wall thickness, length, crystallinity, and electronic structure have a great influence on the performance of the supported particles or loaded matters [12][13][14][15].…”

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confidence: 99%

Carbon nanotubes prepared by anodic aluminum oxide template method

et al. 2011

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One of the most unique structural characteristics of carbon nanotubes (CNTs) differentiating from other carbon materials is their hollow nanochannles, which can be utilized for encapsulating and loading foreign matters. The anodic aluminum oxide (AAO) template technique enables the diameter, length, and cap structure control of the replicated CNTs, and thus shows advantages in pore structure control over the traditional CNT growth approaches. This review details the synthesis of CNTs with tunable diameter, length, wall thickness, and crystalline by using the AAO template method. The doping of heteroatoms and filling of foreign matters into AAO-CNTs are also addressed. Moreover, the main challenges and developing trends of the AAO template method are discussed.carbon nanotubes (CNTs), anodic aluminum oxide (AAO) template method, controllability Citation:Hou P X, Liu C, Shi C, et al. Carbon nanotubes prepared by anodic aluminum oxide template method.

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confidence: 99%

Carbon nanotubes prepared by anodic aluminum oxide template method

et al. 2011

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“…For all the studied kinetic models, the value of the apparent activation energy fits within the narrow range of 80-85 kJ/mol, which is lower than the usual activation energy reported in the other studies (98-104 kJ/mol) (Brötz, 1949;Anderson, 1956;Sarup and Wojciechowski, 1989;Iglesia et al, 1993b;Ribeiro et al, 1997;Zennaro et al, 2000). Previous works have shown that carbon nanotubes have unique physical and chemical properties (compared to other commonly used FTS supports) that change the expected FTS-catalyst surface reactions (Chen et al, 2008;Tavasoli et al, 2008Tavasoli et al, , 2009Trépanier et al, 2009a,b). As reported in many studies, different surface reaction mechanisms and rate determination steps lead to various forms of kinetic equations and kinetic parameters (Brötz, 1949;Anderson, 1956;Sarup and Wojciechowski, 1989;Iglesia et al, 1993b;Ribeiro et al, 1997;Zennaro et al, 2000;Folger, 2002).…”

Section: Kinetic Resultsmentioning

confidence: 70%

“…As reported in other study, at high temperature, olefins are preferentially hydrogenated, and chain propagation is suppressed, which explains the increase of methane selectivity (Dry, 1981;Jacobs et al, 2002). Our previous studies also show that % CO conversion strongly depends on the reaction temperature (Tavasoli et al, 2008;Trépanier et al, 2009a). Indeed, increasing the FTS reaction temperature increases the mobility of hydrogen on the catalyst surface which leads, among several other effects, to higher % CO conversion.…”

Section: Fts Catalyst Activity and Selectivitymentioning

confidence: 60%

“…Previous study demonstrated that the unique structural properties of CNTs as support increases the reducibility of the catalyst, lowers the sintering of the cobalt particles, and increases the FTS products selectivity (Tavasoli et al, 2008(Tavasoli et al, , 2009Trépanier et al, 2009a,b). Indeed, Chen et al (2008) show that the tubular morphology of the grapheme layers make CNTs different compared to other carbonaceous supports.…”

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Kinetics study on cnt‐supported RuKCo FTS catalyst in a fixed bed reactor

et al. 2011

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The rate of syngas (H 2 /CO) consumption over a RuKCo/CNT Fischer-Tropsch synthesis (FTS) catalyst was measured in a fixed bed microreactor at 210-225 • C, 2-3.5 MPa, H 2 /CO feed molar ratios of 1-2.5, and gas hourly space velocity (GHSV) range of 2700-3600 h −1 . The data have been used to model the kinetics of the FTS reactions within the range of the studied conditions. One empirical power law model and four semi-empirical kinetic models based on Langmuir-Hinshelwood-type equation have been evaluated. The best fitting was obtained with the equation:similar to that proposed by Brötz et al. The estimated activation energy (E = 80-85 kJ/mol) is lower than that is reported in the literature. The validity of these results are restricted to fixed beds with the given catalyst in the tested conversion regime.Le taux de consommation de gaz de synthèse (H 2 /CO) sur un catalyseur de synthèse de Fischer-Tropsch (SFT) RuKCo/CNT aété mesuré dans un microréacteurà lit fixeà 210à 225 • C, 2à 3,5 MPa, des rapports molaires d'alimentation H 2 /CO de 1à 2,5 et une portée de vitesse horaire des gaz de 2700à 3600 h −1 . Les données ontété utilisées pour modeler la cinétique des réactions de la SFT au sein de la portée des conditionsétudiées. Un modèle de loi exponentielle empirique et quatre modèles cinétiques semi-empiriques fondés sur uneéquation de type Langmuir-Hinshelwood ontétéévalués. Ce qui correspondait le mieuxétait obtenu avec l'équation suivante:(1 + 7.2 × 10 −2 P 0.72semblableà celle proposée par Brötz et coll. L'énergie d'activation estimée (E = 80-85 KJ/mol) est inférieureà celle rapportée par la littérature. Ces résultats sont associés aux propriétés physiques et chimiques uniques des supports de nanotubes de carbone qui réduisent l'énergie d'activation du catalyseur.

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“…CNTs have been proven to be an excellent candidate as a support in catalytic reactions [1][2][3][4][5] and energy storage processes [6][7][8] because of their desired physicochemical properties, unique pore structure and related confinement effects. The structural characteristics of CNTs, such as diameter, wall thickness, length, crystallinity, and whether the ends are open or closed, have a great influence on their overall performance in these applications.…”

Section: Introductionmentioning

confidence: 99%

Template synthesis of ultra-thin and short carbon nanotubes with two open ends

Hou

Shi

et al. 2012

J. Mater. Chem.

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Anodic aluminium oxide (AAO) films containing small diameter channels with both ends open were prepared for use as a growth template for carbon nanotubes (CNTs). The smallest channel diameter was 7 nm and the smallest film thickness was 2 mm. The CNTs produced from the AAO template by chemical vapor deposition of acetylene had controllable outer and inner diameters and length, and open ends. The pore texture, structure and crystallinity of the CNTs were characterized by electron microscopy, nitrogen gas adsorption-desorption, and thermogravimetric analysis. The inner diameters of the CNTs were adjustable by selecting AAO templates with specific channel diameters and/or tuning the duration of chemical vapor deposition. CNTs with an outer diameter, inner diameter and length of 7 nm, 4.5 nm and 2 mm, respectively, were obtained, the narrowest and shortest ever reported for CNTs with two open ends. These thin, short, and open CNTs would render easy access, filling and transport of foreign matter into their one-dimensional cavity with prominent confinement effects.

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Fischer–Tropsch synthesis over cobalt catalyst supported on carbon nanotubes in a slurry reactor

Cited by 154 publications

References 12 publications

Carbon nanotubes prepared by anodic aluminum oxide template method

Carbon nanotubes prepared by anodic aluminum oxide template method

Kinetics study on cnt‐supported RuKCo FTS catalyst in a fixed bed reactor

Template synthesis of ultra-thin and short carbon nanotubes with two open ends

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