Transition Metal Sulfides- and Noble Metal-Based Catalysts for N-Hexadecane Hydroisomerization: A Study of Poisons Tolerance

Pimerzin, Aleksey A.; Savinov, A. A.; Вутолкина, А. В.; Makova, Anna; Glotov, Aleksandr; Винокуров, В. А.; Пимерзин, А. А.

doi:10.3390/catal10060594

Cited by 22 publications

(9 citation statements)

References 65 publications

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“…Because of the low MSI of the lamellar structure catalysts, more Ni atoms were doped into the WS 2 slabs (proven by the XPS results), resulting in a decrease in the periodicity of the W species and a shorter slab length of WS 2 slabs. The WS 2 hexagonal crystallites decorated with Ni atoms on the edges are the active phase of NiWS catalysts . Due to this property, the NiWS active sites are located at the edge of the WS 2 hexagonal slabs in the W atomic plane.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of Lamellar Structural Flower-like SAPO-11 Molecular Sieves with Hierarchical Pores for Enhanced Selectivity of Isomeric Alkanes in Hydroisomerization

Wang

Zhou

et al. 2023

Ind. Eng. Chem. Res.

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A novel SAPO-11 molecular sieve with a lamellar structure and flower-like morphology was synthesized using cationic surfactant cetyltrimethylammonium bromide (CTAB) as the surfactant and KF as the mineralizer. Meanwhile, the effect of various CTAB additions on the structure and properties of SAPO-11 molecular sieves was also investigated. A number of characterization analyses’ findings reveal that, compared with conventional spherical SAPO-11 molecular sieves, flower-like SAPO-11 molecular sieves have the following advantages: (1) Flower-like SAPO-11 molecular sieves have open pores and larger mesopores, with suitable distribution of mesopores. (2) The prepared flower-like SAPO-11 molecular sieves have a lower total acid value but have a higher proportion of Brønsted acid sites, with suitable acidity. (3) The flower-like NiW/SAPO-11 catalysts have better dispersion of WS2 slabs and higher balance and proximity between metal sites and acid sites. The synthesized flower-like NiW/SAPO-11 showed significant isomerization performance and low cracking selectivity during the isomerization of n-hexadecane. When the conversion rate of n-hexadecane reached 77.0%, the yield of i-hexadecane was 59.4%.

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Section: Resultsmentioning

confidence: 99%

Synthesis of Lamellar Structural Flower-like SAPO-11 Molecular Sieves with Hierarchical Pores for Enhanced Selectivity of Isomeric Alkanes in Hydroisomerization

Wang

Zhou

et al. 2023

Ind. Eng. Chem. Res.

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“…14 These factors are the reasons for the increase in the intrinsic kinetic rate constant of the hydroisomerization of n-C 16 over the catalysts. Pimerzin et al 47 prepared a NiWS/ Al 2 O 3 −SAPO-11 catalyst for the hydroisomerization of nhexadecane. The maximum reaction rate constant of hydroisomerization of n-hexadecane on the catalyst calculated by them is 1.05 ± 0.0006 × 10 −4 mol g −1 h −1 , which is far less than the reaction rate constant on the catalysts in this work.…”

Section: Catalytic Performancementioning

confidence: 99%

Deep Hydroisomerization of n-Hexadecane over NiWS/SAPO-11 Catalyst: Size Effect of the Support and Revelation of the Reaction Network

Dai,

Cheng,

Liu

et al. 2023

Energy Fuels

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SAPO-11 molecular sieves with different crystal sizes and particle sizes, especially nanosized small-crystal SAPO-11 molecular sieves, were successfully synthesized, and the corresponding NiWS-supported catalysts were prepared for the hydroisomerization of n-hexadecane. XRD, SEM, N2 adsorption–desorption, Py-IR, and HRTEM were used to analyze the effects of crystal size and particle size of the supports on their physicochemical properties, active phase properties, and catalytic performance of the catalysts. Through reaction evaluation and analysis of isomeric products, the effects of the size change of the support on the hydroisomerization performance of the catalyst and the hydroisomerization depth of n-hexadecane were determined. Through comprehensive analysis of the cracking products, it was determined that secondary cracking occurred when the conversion of n-hexadecane on the NiW/SAPO-11-S catalyst reached about 42.7%, and the secondary isomerization occurred when the conversion of n-hexadecane reached about 80%. The hydroisomerization reaction network of n-hexadecane over the NiWS/SAPO-11 catalyst was studied emphatically, and it was found for the first time that the secondary cracking of n-hexadecane during hydroisomerization followed the C3-β-scission mechanism.

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“…Two major reasons could be responsible for the observed activity discrepancy between the two catalysts. One is that the intrinsic activity of the noble metal Pt is higher than the NiMo catalyst [41]. Another reason could be the dependence of hydrocarbon reactivity on chain length, with it increasing significantly with chain length up to C 33 [23,[42][43][44].…”

Section: Isoparaffin Content Versus Carbon Numbermentioning

confidence: 99%

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

Kang

Jacobs

et al. 2021

Reactions

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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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Transition Metal Sulfides- and Noble Metal-Based Catalysts for N-Hexadecane Hydroisomerization: A Study of Poisons Tolerance

Cited by 22 publications

References 65 publications

Synthesis of Lamellar Structural Flower-like SAPO-11 Molecular Sieves with Hierarchical Pores for Enhanced Selectivity of Isomeric Alkanes in Hydroisomerization

Synthesis of Lamellar Structural Flower-like SAPO-11 Molecular Sieves with Hierarchical Pores for Enhanced Selectivity of Isomeric Alkanes in Hydroisomerization

Deep Hydroisomerization of n-Hexadecane over NiWS/SAPO-11 Catalyst: Size Effect of the Support and Revelation of the Reaction Network

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

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