Nickel/gallium modified HZSM-5 for ethane aromatization: Influence of metal function on reactivity and stability

Fadaeerayeni, Siavash; Shan, Junjun; Sarnello, Erik; Xu, Haiping; Wang, Hui; Cheng, Jiansong; Li, Tao; Toghiani, Hossein; Xiang, Yizhi

doi:10.1016/j.apcata.2020.117629

Cited by 22 publications

(16 citation statements)

References 53 publications

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“…However, the selectivity of CH 4 , C 2 H 4 , and HCN increased at the expense of CH 3 CN selectivity (Figure a). The formation of CH 4 from ethane hydrogenolysis/cracking is unwanted but frequently reported to be out of control during ethane conversion. , At 500 °C, the selectivity of CH 3 CN is decreased to 62.8%, and the byproduct CH 4 selectivity is ∼17.4%. The selectivities of C 2 H 4 and HCN are both ∼10%, and the sum selectivity of CH 3 CN, C 2 H 4 , and HCN is up to 82% at ∼15% ethane conversion.…”

Section: Resultsmentioning

confidence: 99%

Catalytic Light Alkanes Conversion through Anaerobic Ammodehydrogenation

et al. 2021

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Catalytic transformation of light alkanes could have considerable practical value, yet remains one of the most challenging areas in catalysis research due to the inertness of the C–H bond. Here, we proposed an efficient ammodehydrogenation (ADeH) catalytic system for the direct C–N linkage between light alkanes and ammonia for CH3CN and H2 (CO x free) production. This breakthrough is achieved over bifunctional metal-modified HZSM-5 catalysts, through the tandem dehydrogenation–amination–dehydrogenation mechanism. We show that ethane ADeH over the Pt/HZSM-5 catalyst can be realized under atmospheric pressure at temperatures as low as 350 °C. The specific rate of CH3CN is ∼60 μmol/(g min), and the selectivity is up to 99% under such mild conditions. The yield of CH3CN increases with increasing temperature; however, the selectivity decreases due to the formation of HCN, C2H4, and CH4. Additionally, the Pt/HZSM-5 catalyst is coke-resistant during the ADeH owing to the strong interaction between NH3 and the acid sites of the catalyst. We anticipate that the proposed ADeH could be extended for the transformation of various n/iso-alkanes with tunable selectivity to alkene and nitriles.

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Section: Resultsmentioning

confidence: 99%

Catalytic Light Alkanes Conversion through Anaerobic Ammodehydrogenation

et al. 2021

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“…The XPS spectrum of Ga/HZSM-5 showed only the Ga 2 O 3 species at 1118.1 eV. 62 There were two characteristic peaks of In at 440.7–448 and 448–455.2 eV, both being ascribed to In 2 O 3 . 63 The fitting peaks of the Ni 2p region were NiO (857.1–860.8 eV for Ni 2p 3/2 and 875.0–878.5 eV for Ni 2p 1/2 ) and satellite peaks (862.2–864.0 eV for Ni 2p 3/2 and 880.8–882.5 eV for Ni 2p 1/2 ).…”

Section: Results and Discussionmentioning

confidence: 93%

Catalytic Pyrolysis of Nonedible Oils for the Production of Renewable Aromatics Using Metal-Modified HZSM-5 Catalysts

Liu

Zhang

et al. 2022

ACS Omega

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Catalytic pyrolysis of triglycerides to aromatics over zeolites is an advanced technology for a high value-added utilization of renewable biomass resources. Therefore, in this research, the catalytic performance of M/HZSM-5 catalysts (M = Zn, Ga, In, Ni, and Mo) during the pyrolysis process of glycerol trioleate and the effect of the compositional difference of several woody oils and waste oils on aromatic formation were investigated. Results revealed that Zn/HZSM-5 with appropriate acidity and metal sites reached the maximum aromatics yield (56.13%) and significantly enhanced the catalytic stability. In addition, these renewable nonedible oils were effectively converted to aromatics over the Zn/HZSM-5 catalyst, the aromatic yield of jatropha oil reached up to 50.33%, and the unsaturation and double bond number of feedstocks were crucial for the production of aromatics. The utilization of biomass resources to produce high value-added aromatics can alleviate the problems caused by the shortage of fossil resources and achieve sustainable green development.

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“…When using light alkanes for dehydroaromatization, the presence active sites for dehydrogenation of alkanes into alkenes is critical. For instance, the presence of NiGa alloys can facilitate the dehydrogenation of ethane into ethylene, which can be further converted into aromatics (benzene, toluene, and xylene) by the isolated Ga species confined in ZSM-5 zeolite 160 . Considering the dehydrogenation of light alkanes to corresponding olefins is more favourable on subnanometric metal clusters, loading a small amount of subnanometric metal clusters (such as Pt or Ni) on Ga-zeolite crystallites to enhance the initial step (dehydrogenation of alkane to olefin) may lead to improvements in the yields of aromatics.…”

Section: Alkane Dehydroaromatizationmentioning

confidence: 99%