Effect of metal–acid balance and textual modifications on hydroisomerization catalysts for n-alkanes with different chain length: A mini-review

Wei, Chenhao; Zhang, Guohao; Zhao, Liang; Gao, Jinsen; Chen, Xu

doi:10.1016/j.fuel.2021.122809

Cited by 42 publications

(19 citation statements)

References 116 publications

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“…The amount of accessible Pt guarantees that the metal-acid of bifunctional catalysts was well-balanced and the rate-determining step was skeleton rearrangement of the carbocations on the acid sites of the zeolite surface. 29 The above result also demonstrated that alkali treatment had little effect on the distribution of Pt on the zeolite surfaces.…”

Section: Resultsmentioning

confidence: 69%

“…To further obtain information about the framework changes of the ZSM-22 zeolite during the alkali and acid modification process, 27 Al and 29 Si MAS NMR spectra are conducted to analyze the chemical environment of the Al and Si atoms. Fig.…”

Section: Resultsmentioning

confidence: 99%

“…Fig. 4d measured the 29 Si MAS NMR spectra of alkali-acid treatment supports. The area ratio of Si(1Al)/Si(0Al) was decreased compared with those before acid treatment due to the dealumination process of acid.…”

Section: Resultsmentioning

confidence: 99%

“…According to the spectral line intensity of elements with a scintillation counter and proportional counter, the mass fraction of each element on the sample was semi-quantitatively analyzed by the external standard method. 27 Al and 29 Si solid-state magic-angle spinning nuclear magnetic resonance (MAS NMR) spectra were obtained on a Bruker Avance III 600 M solid-state NMR system and Bruker Avance III 500 M solid-state NMR system to probe the chemical environment of Al and Si for all different catalysts, respectively. The NMR test conditions: For 27 Al MAS NMR, the radio frequency was 156.39 MHz, speed: 10000 Hz, delay time: 1 s, sampling time: 16.4 ms, pulse width: 0.9 ms, calibration compound: aluminum nitrate (Al (NO 3 ) 3 ).…”

Section: Characterization Of Catalystsmentioning

confidence: 99%

“…The NMR test conditions: For 27 Al MAS NMR, the radio frequency was 156.39 MHz, speed: 10000 Hz, delay time: 1 s, sampling time: 16.4 ms, pulse width: 0.9 ms, calibration compound: aluminum nitrate (Al (NO 3 ) 3 ). For 29 Si MAS NMR, the radio frequency was 99.28 MHz, speed: 5 Hz, delay time: 4 s, sampling time: 23.48 ms, pulse width: 2.3 ms, calibration compound: TMS.…”

Section: Characterization Of Catalystsmentioning

confidence: 99%

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Investigation of n-heptane hydroisomerization over alkali-acid-treated hierarchical Pt/ZSM-22 zeolites

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et al. 2022

New J. Chem.

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Section: Resultsmentioning

confidence: 69%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Characterization Of Catalystsmentioning

confidence: 99%

Section: Characterization Of Catalystsmentioning

confidence: 99%

See 3 more Smart Citations

Investigation of n-heptane hydroisomerization over alkali-acid-treated hierarchical Pt/ZSM-22 zeolites

Kai

Wang

et al. 2022

New J. Chem.

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show abstract

Hydrogenolysis‐Isomerization of Waste Polyolefin Plastics to Multibranched Liquid Alkanes

Chen

Ling

et al. 2023

ChemSusChem

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Upcycling of waste polyolefin plastics still meets with economic and technological challenges in practice. In this work, the catalytic hydrogenolysis‐isomerization of nondegradable polyolefin plastic waste to high‐value gasoline, diesel, and light lubricants with highly branched chain is achieved over a bifunctional Rh/Nb2O5 catalyst under relatively mild conditions. Owing to the high efficiency of metallic Rh active sites, the dehydrogenation/hydrogenation of long carbon chains of polyolefins is enhanced. With the assistance of strong Brønsted acidity of Nb2O5, the cleavage of C−C bonds, skeletal rearrangements, as well as the β‐scission of alkylcarbenium ions occurs, which boosts the one‐step solvent‐free catalytic hydrogenolysis and isomerization of polyolefins. In addition, the preliminary economic analysis shows that this technology is economical, feasible, and has great potential in accelerating the transition to a circular plastics economy for sustainable development.

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Ni/ZSM‐23 Catalysts: Effect of Impregnating Solvent on the Hydroisomerization of n‐Hexadecane

Wang,

Yan,

Shao

et al. 2024

ChemistrySelect

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Bifunctional catalysts are widely used in the hydroisomerization of long‐chain n‐alkanes, which are of great significance in the production of high value‐added chemicals. Herein, the Ni/ZSM‐23‐W and Ni/ZSM‐23‐EG catalysts were prepared using water and ethylene glycol, respectively. The catalysts were characterized using XRD, SEM, TEM, NH3‐TPD, Py–IR, H2‐TPR, H2‐TPD, ICP–OES, and XPS, and their catalytic performance was evaluated by conducting the hydroisomerization of n‐hexadecane as a model reaction. It was revealed that the polarity of the impregnating solvent has a significant impact on the dispersion of Ni nanoparticles. When employing ethylene glycol as a solvent, a strong interaction occurred between NiOx and ZSM‐23 in the Ni/ZSM‐23‐EG catalyst, which facilitated the formation of small‐sized and well‐dispersed Ni nanoparticles. Consequently, the Ni/ZSM‐23‐EG catalyst demonstrated a strong hydrogenation capacity, yielding an impressive 72.9% of iso‐hexadecanes yield.

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Effect of metal–acid balance and textual modifications on hydroisomerization catalysts for n-alkanes with different chain length: A mini-review

Cited by 42 publications

References 116 publications

Investigation of n-heptane hydroisomerization over alkali-acid-treated hierarchical Pt/ZSM-22 zeolites

Investigation of n-heptane hydroisomerization over alkali-acid-treated hierarchical Pt/ZSM-22 zeolites

Hydrogenolysis‐Isomerization of Waste Polyolefin Plastics to Multibranched Liquid Alkanes

Ni/ZSM‐23 Catalysts: Effect of Impregnating Solvent on the Hydroisomerization of n‐Hexadecane

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