Effect of different alumina supports on performance of cobalt Fischer-Tropsch catalysts

Rahmati, Mahmood; Huang, Baiyu; Mortensen, Max K.; Keyvanloo, Kamyar; Fletcher, Thomas H.; Woodfield, Brian F.; Hecker, William C.; Argyle, Morris D.

doi:10.1016/j.jcat.2017.12.022

Cited by 62 publications

(20 citation statements)

References 55 publications

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“…The MA was used as the support material for Fischer−Tropsch synthesis and CO 2 hydrogenation. 24,25 Herein, the four MA samples are prepared by varying the molar H 2 O/AIP ratio (r) such as 2:1, 5:1, 10:1, and 15:1 (denoted as MA-w2, MA-w5, MA-w10, and MA-w15, respectively), and used as a support for Pt loading of 1 wt %. The so-obtained Pt catalysts are tested in the HDO of palm oil under one of the conditions that we reported recently.…”

Section: ■ Introductionmentioning

confidence: 99%

“…The original synthesis was developed by Huang et al , and further studied by Xie et al The pore structure and morphology of the prepared MA were controlled by the molar ratio of water to aluminum alkoxide because the added water could determine the hydrolysis rate and the produced alcohol was able to change the morphology of boehmite precursor. The MA was used as the support material for Fischer–Tropsch synthesis and CO 2 hydrogenation. , Herein, the four MA samples are prepared by varying the molar H 2 O/AIP ratio ( r ) such as 2:1, 5:1, 10:1, and 15:1 (denoted as MA-w2, MA-w5, MA-w10, and MA-w15, respectively), and used as a support for Pt loading of 1 wt %. The so-obtained Pt catalysts are tested in the HDO of palm oil under one of the conditions that we reported recently .…”

Section: Introductionmentioning

confidence: 99%

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Superior Long-Term Stability of a Mesoporous Alumina-Supported Pt Catalyst in the Hydrodeoxygenation of Palm Oil

Jeong

Bathula

Kim

et al. 2021

ACS Sustainable Chem. Eng.

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Catalyst stability in the hydrodeoxygenation of vegetable oils is one of the big challenges for practical production of bio-jet fuel. Particularly, supported Pt catalysts are known to show activity decay because of Pt sintering and coking. Herein, we report superior long-term stability of the Pt catalyst in the hydrodeoxygenation of palm oil by using the mesoporous γ-Al2O3 (MA) support synthesized by solvent-deficient precipitation (SDP). When the MA was prepared with a molar ratio of water to aluminum isopropoxide being five, the space-time yield of the Pt catalyst was maintained at ca. 6.09 mol kg–1 h–1 for over 80 h, which was much better than those of the other Pt catalysts. This result was attributed to the two properties such as well-developed mesopores of a larger diameter than 20 nm in the fresh MA and strong metal–support interaction of Pt/MA. Therefore, the SDP method could endow the alumina support with textural and chemical benefits for stable performance. Furthermore, the hydrodeoxygenated palm oil was converted into paraffinic hydrocarbons mainly ranging from C8 to C15 with an iso- /n-paraffin ratio of ca. 6.8, perfectly meeting the standard specifications of bio-jet fuel.

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Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Superior Long-Term Stability of a Mesoporous Alumina-Supported Pt Catalyst in the Hydrodeoxygenation of Palm Oil

Jeong

Bathula

Kim

et al. 2021

ACS Sustainable Chem. Eng.

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“…Alumina supported catalysts have been synthesised using a wet co-impregnation method similar to the one documented in the literature for iron 39 , cobalt 40 and palladium 41 precursors. The bimetallic catalysts were prepared with three salts, purchased from…”

Section: Catalyst Preparationmentioning

confidence: 99%

3D printed catalytic reactors for aerobic selective oxidation of benzyl alcohol into benzaldehyde in continuous multiphase flow

Jacquot

Köckritz

Pohar

et al. 2021

Sustainable Materials and Technologies

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This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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“…Despite its higher cost, supported cobalt is preferred over iron catalysts for the FT reaction when the emphasis is on making fuels, due to its high per pass activity, high C5+ selectivity, longer catalyst lifetime, low oxygenate and CO2 selectivity and at present it accounts for a combined estimated world production capacity of 250 000 barrels per day. [5][6][7][8][9] Supporting cobalt on metal oxides usually achieves high dispersions, but the for-mation of hard-to-reduce small Co nanoparticles and mixed compounds (such as Co2AlO4, CoTiO4 or Co2SiO4) can result in under utilization of Co because of the strong metal-support interactions associated with these materials.…”

Section: Introductionmentioning

confidence: 99%

Post doped nitrogen-decorated hollow carbon spheres as a support for Co Fischer-Tropsch catalysts

et al. 2020

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In this study the outer surface of porous hollow carbon spheres (HCSs) materials were functionalized by N-doping using a post-synthesis method and they were used as a Fischer-Tropsch catalyst support. Melamine was used as the nitrogen source, and carbonization was performed at diff erent temperatures (600 and 900 °C) to introduce variable levels of N into the HCSs, with diff erent bonding configurations. This procedure allowed for the incorporation of up to 13% N. Our results show that post-synthesis N-doping introduced marginal defects into the carbon framework and this did not aff ect the thermal stability of the materials. XPS studies revealed that the surface content on these materials varied and provided evidence for temperaturetunable bonding configurations. Eff ects associated with post-synthesis N-doping were apparent on the Co catalyst (˜10 wt.%) properties such as the inhibited reduction caused by a metal-support interaction observed by the H2-TPR and in situ PXRD techniques. As a consequence the Fischer-Tropsch performance was influenced as both the activity and stability were improved on the catalysts supported on the N-doped materials. TEM analysis of the spent catalysts demonstrated the influence of N-doping on the sintering characteristics of Co, with particles > 30 nm measured on the N-free catalyst while Ndoped samples had sizes < 15 nm.

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Effect of different alumina supports on performance of cobalt Fischer-Tropsch catalysts

Cited by 62 publications

References 55 publications

Superior Long-Term Stability of a Mesoporous Alumina-Supported Pt Catalyst in the Hydrodeoxygenation of Palm Oil

Superior Long-Term Stability of a Mesoporous Alumina-Supported Pt Catalyst in the Hydrodeoxygenation of Palm Oil

3D printed catalytic reactors for aerobic selective oxidation of benzyl alcohol into benzaldehyde in continuous multiphase flow

Post doped nitrogen-decorated hollow carbon spheres as a support for Co Fischer-Tropsch catalysts

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