Liquid fuels from Fischer–Tropsch wax hydrocracking: Isomer distribution

Gamba, Simone; Pellegrini, Laura; Calemma, Vincenzo; Gambaro, Chiara

doi:10.1016/j.cattod.2010.01.009

Cited by 37 publications

(30 citation statements)

References 29 publications

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“…A comparatively low concentration of multibranched material is typically observed in a hydrocracking product from Fischer-Tropsch waxes over selective wax hydrocracking catalysts [39,40]. It has been found that, during the hydrocracking of Fischer-Tropsch wax over a Pt/SiO 2 -Al 2 O 3 catalyst, the amount of multibranched alkanes exceeded the amount of monobranched alkanes only in the heavier product fraction, that is, C 18 -C 19 and heavier, irrespective of the conversion [40].…”

Section: Hydrocrackingmentioning

confidence: 99%

“…A high hydrocracking conversion is required to produce a kerosene with high iso:n-ratio, since the degree of isomerization of the kerosene fraction from wax hydrocracking is low at low conversion [40]. A high hydrocracking conversion is required to produce a kerosene with high iso:n-ratio, since the degree of isomerization of the kerosene fraction from wax hydrocracking is low at low conversion [40].…”

Section: Hydrocrackingmentioning

confidence: 99%

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Fischer‐Tropsch Refining

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Section: Hydrocrackingmentioning

confidence: 99%

Section: Hydrocrackingmentioning

confidence: 99%

Cracking

2011

Fischer‐Tropsch Refining

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“…Generally, hydrocracking is conducted over metal/acid bifunctional catalysts [1,[3][4][5][6][7][8][9]. The most conventional hydrocracking catalysts are noble metal (Pt and Pd) catalysts [10] and non-noble metal catalysts such as NiMo, NiCo, CoMo, NiW, WZr catalysts [11][12][13][14][15][16]. The balance between metal sites and acid sites in supports is crucial for the catalyst performance, as are the support physical properties (e.g., pore size and BET surface area) [13,[16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Hydrocracking of Octacosane and Cobalt Fischer–Tropsch Wax over Nonsulfided NiMo and Pt-Based Catalysts

Kang

Jacobs

et al. 2021

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The effect of activation environment (N2, H2 and H2S/H2) on the hydrocracking performance of a NiMo/Al catalyst was studied at 380 °C and 3.5 MPa using octacosane (C28). The catalyst physical structure and acidity were characterized by BET, XRD, SEM-EDX and FTIR techniques. The N2 activation generated more active nonsulfided NiMo/Al catalyst relative to the H2 or H2S activation (XC28, 70–80% versus 6–10%). For a comparison, a NiMo/Si-Al catalyst was also tested after normal H2 activation and showed higher activity at the same process conditions (XC28, 81–99%). The high activity of the NiMo/Al (N2 activation) and NiMo/Si-Al catalysts was mainly ascribed to a higher number of Brønsted acid sites (BAS) on the catalysts. The hydrocracking of cobalt wax using Pt/Si-Al and Pt/Al catalysts confirmed the superior activity of the Si-Al support. A double-peak product distribution occurred at C4–C6 and C10–C16 on all catalysts, which illustrates secondary hydrocracking and faster hydrocracking at the middle of the chain. The nonsulfided NiMo/Al and Pt/Al catalysts, and NiMo/Si-Al catalyst produced predominantly diesel (sel. 50–70%) and gasoline range (sel. > 50%) hydrocarbons, respectively, accompanied by some CH4 and light hydrocarbons C2–C4. On the other hand, the hydrocarbon distribution of the Pt/Si-Al varied with conditions (i.e., diesel sel. 87–90% below 290 °C or gasoline sel. 60–70% above 290 °C accompanied by little CH4) The dependence of the isomer/paraffin ratio on chain length was studied as well. The peak iso/paraffin value was observed at C10–C13 for the SiAl catalyst.

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“…Conversion of coals, natural gas and/or biomass to liquid hydrocarbons via gasification and subsequent Fischer-Tropsch synthesis (FTS) is an attractive method to obtain high-quality liquid fuels. Furthermore, FTS-derived fuels have excellent combustion properties and lead to a reduction of pollution emission [1,2]. Unfortunately, FTS could produce a wide range of hydrocarbons, such as gaseous hydrocarbons, gasoline, diesel and wax depending on catalyst and reaction conditions [3,4].…”

Section: Introductionmentioning

confidence: 99%

Pore size-controlled synthesis of molecular sieves and theirs difference in catalytic properties for Fischer–Tropsch synthesis

Wang

Liu

et al. 2015

Appl Petrochem Res

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Three molecular sieves with different pore size distributions, i.e., mesopore (Al-MCM-41), micropore (ZSM-5) and hierarchical pore (HPMS), were synthesized under hydrothermal condition and characterized by N 2 adsorption-desorption. Three cobalt-loaded catalysts, i.e., Co/Al-MCM-41, Co/ZSM-5 and Co/HPMS, were prepared by impregnating cobalt nitrate onto three molecular sieves, respectively, and characterized by X-ray diffraction, scanning electron microscopy, and H 2 temperature-programmed reduction (H 2 -TPR). The H 2 -TPR results show that the reduction temperature of Co/HPMS is lower than those of Co/Al-MCM-41 and Co/ZSM-5, indicating that Co/HPMS has a better catalytic activity. The selectivity of three catalysts for Fischer-Tropsch synthesis was evaluated in a fixed-bed reactor, and the results show that the pore structure is of important influence on the product distribution. Co/HPMS exhibits significantly good selectivity of C 5-11 and C 12-18 hydrocarbons (up to 25.6 and 27.7 %, respectively), much higher than those of Co/Al-MCM-41 and Co/ZSM-5, due to the confinement effect of micropore and good diffusibility for long-chain hydrocarbons of mesopore in Co/HPMS.

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Liquid fuels from Fischer–Tropsch wax hydrocracking: Isomer distribution

Cited by 37 publications

References 29 publications

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Hydrocracking of Octacosane and Cobalt Fischer–Tropsch Wax over Nonsulfided NiMo and Pt-Based Catalysts

Pore size-controlled synthesis of molecular sieves and theirs difference in catalytic properties for Fischer–Tropsch synthesis

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