An efficient Ni–Mo–K sulfide catalyst doped with CNTs for conversion of syngas to ethanol and higher alcohols

Wang, Jijie; Xie, Jun; Huang, Yandong; Chen, Binghui; Lin, Guo-Dong; Zhang, Hongbin

doi:10.1016/j.apcata.2013.08.026

Cited by 40 publications

(21 citation statements)

References 27 publications

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“…It is commonly accepted [13,[33][34][35] that selectivity in this reaction is calculated in CO 2 free basis approximation. The reason for that is the following: the CO 2 is mainly formed in the course of water gas shift or Boudouard reactions and is considered as by-product does not affecting the selectivity of the target products.…”

Section: Catalytic Experiments and Analysis Of Productsmentioning

confidence: 99%

Effect of Promoter Nature on Synthesis Gas Conversion to Alcohols over (K)MeMoS₂/Al₂O₃ Catalysts

et al. 2020

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The influence of the promoter nature and of a modifier in (K)(Me)MoS2/Al2O3 (Me=Fe, Co, Ni) catalysts on the conversion and selectivity of products of synthesis gas conversion to alcohols and jnl oxygenates was investigated. Relationships between promoter nature, hydrocarbon chain length and selectivity in the formed alcohols were established. Electronic structure of a promoter atom in an active site (AS) was found to strongly affect selectivity of alcohol formation. Promotion of the S‐edge by Fe, Co or Ni suppressed hydrogen activation, which resulted in a lower synthesis gas conversion. Promotion of the M‐edge by Fe, Co, or Ni entailed the formation of double vacancies which are active sites of synthesis gas conversion. Potassium affected the oxophilicity of Mo atoms and reduced Co/Ni‐promoted MoS AS. It decreased the probability of C−O bond breaking in the adsorbed intermediate and shifted selectivity from the formation of alkyl towards alkoxide fragments over these catalysts.

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Section: Catalytic Experiments and Analysis Of Productsmentioning

confidence: 99%

Effect of Promoter Nature on Synthesis Gas Conversion to Alcohols over (K)MeMoS₂/Al₂O₃ Catalysts

et al. 2020

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“…The Ni-Mo-K sulfide catalysts doped with CNTs were synthesized and showed high activity and selectivity to alcohols, especially to ethanol. 222 A Ni0.5Mo1K0.5-15% CNTs catalyst exhibited ethanol selectivity of 33.1% (CO 2 -free) under the reaction conditions of 8.0 MPa and 593 K. CNTs can adsorb and activate hydrogen to generate a surface microenvironment and a higher stationary-state concentration of the adsorbed hydrogen species resulting in a sharp increase in the concentration of the catalytically active Mo 4+ /Mo 5+ species on the surface of catalysts.…”

Section: Carbon Nanotubes and Nanofibers Supported Metal Catalystsmentioning

confidence: 99%

“…Other metals supported on CNTs were applied in FTS such as Rh, 217,218 Ru, [219][220][221] NiMo. 222 The Rh particles confined within nanotubes have a significantly enhanced catalytic activity for the conversion of CO and H 2 to ethanol. The total ethanol formation rate inside the nanotubes (30.0 mol mol Rh À1 h À1 ) is an order of magnitude higher than the total generation rate outside the nanotubes, although the latter is easier to obtain.…”

Section: Carbon Nanotubes and Nanofibers Supported Metal Catalystsmentioning

confidence: 99%

Carbon-based catalysts for Fischer–Tropsch synthesis

et al. 2021

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“…The interaction of activated carbon with the Ni-Mo species prevents the complete reduction of the active metals (Ni 0 and Mo 0 lead to methane formation) and preserves partially oxidized Mo and Ni species, which are thought to be active sites for alcohol formation. 14 Zhang et al, 15 synthesized Ni-Mo-K sulfide doped with 15% carbon nanotubes (CNT) and used for the syngas-to-HAS reaction. The authors concluded that CNT assists the hydrogen spillover to Ni-Mo-K surface and stabilizes the partially oxidized Ni-Mo species which led to higher alcohol formation.…”

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confidence: 99%

Ammonia treated Mo/AC catalysts for CO hydrogenation with improved oxygenates selectivity

et al. 2017

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A series of ammonia treated Mo/Activated Carbon (AC) catalysts were synthesized by wet impregnation method by nominal incorporation of 5, 10 and 15 wt% of molybdenum. The calcined catalysts (500 • C, 4 h, N 2 flow) were subjected to a stepwise ammonia treatment at temperatures from 25 up to 700 • C. This work reports for the first time, ammonia treated different loadings of Mo on DARCO mesoporous activated carbon for CO hydrogenation reaction. These catalysts were tested in the reaction temperature range of 250-325 • C, 7 MPa and 12000/h (GHSV for reactor volume 0.5 mL). At 250 • C, all the catalysts showed total oxygenate selectivity of ∼50%, mainly methanol. At 325 • C, total oxygenate selectivity of 16.5% with 18% CO conversion was obtained on 10Mo-N/AC. The result of alcohol distribution revealed high selectivity to propanol (39%) over methanol (34%) at 325 • C on 10Mo-N/AC which highlights its unique catalytic behavior in CO hydrogenation. Further, 10MoO 3 /AC catalyst, with no treatment of ammonia, showed only 4% of CO conversion with 96% hydrocarbon selectivity. Only 0.5% of CO conversion was observed on AC itself at 325 • C. The improved oxygenates selectivity on 10Mo-N/AC was associated with Mo δ + sites on AC generated via ammonolysis.

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An efficient Ni–Mo–K sulfide catalyst doped with CNTs for conversion of syngas to ethanol and higher alcohols

Cited by 40 publications

References 27 publications

Effect of Promoter Nature on Synthesis Gas Conversion to Alcohols over (K)MeMoS₂/Al₂O₃ Catalysts

Effect of Promoter Nature on Synthesis Gas Conversion to Alcohols over (K)MeMoS₂/Al₂O₃ Catalysts

Carbon-based catalysts for Fischer–Tropsch synthesis

Ammonia treated Mo/AC catalysts for CO hydrogenation with improved oxygenates selectivity

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An efficient Ni–Mo–K sulfide catalyst doped with CNTs for conversion of syngas to ethanol and higher alcohols

Cited by 40 publications

References 27 publications

Effect of Promoter Nature on Synthesis Gas Conversion to Alcohols over (K)MeMoS2/Al2O3 Catalysts

Effect of Promoter Nature on Synthesis Gas Conversion to Alcohols over (K)MeMoS2/Al2O3 Catalysts

Carbon-based catalysts for Fischer–Tropsch synthesis

Ammonia treated Mo/AC catalysts for CO hydrogenation with improved oxygenates selectivity

Contact Info

Product

Resources

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Effect of Promoter Nature on Synthesis Gas Conversion to Alcohols over (K)MeMoS₂/Al₂O₃ Catalysts

Effect of Promoter Nature on Synthesis Gas Conversion to Alcohols over (K)MeMoS₂/Al₂O₃ Catalysts