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Mechanistic understanding of ethane dehydrogenation and aromatization over Zn/ZSM-5: Effects of Zn modification and COco-reactant

Catalysis Science and Technology, ISSN: 2044-4761, Vol: 10, Issue: 24, Page: 8359-8373
2020
  • 25
    Citations
  • 0
    Usage
  • 24
    Captures
  • 0
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    25
    • Citation Indexes
      25
  • Captures
    24

Article Description

Due to the vigorous development of shale gas production technology, the aromatization of light alkanes has become more attractive for the chemical industry. Ethane dehydrogenation/aromatization over Zn/ZSM-5 catalyst was investigated using density functional theory calculations to clarify the intrinsic effects of introducing a Zn modifier and CO2 co-reactant on the catalytic activity and performance. Introducing Zn to HZSM-5 resulted in the creation of new active sites composed of (Zn-O-Zn)2+ species and thus altered the reaction pathways and reduced the kinetic barriers of ethane dehydrogenation. Moreover, Zn/ZSM-5 significantly suppressed methane by-product formation as compared to the unmodified ZSM-5, leading to an increased selectivity to aromatic products. In the presence of CO2, the H2O produced via the reverse water gas shift (RWGS) reaction could hydrolyze the (Zn-O-Zn)2+ active sites and produce weaker acid sites, which correspond to the increased barriers for ethane dehydrogenation. The participation of H2O in ethane conversion also reduced the catalytic activity of Zn/ZSM-5. The present DFT results predict that adding Pt or Fe as a second modifier for Zn/ZSM-5 helps to prevent the hydrolysis of (Zn-O-Zn)2+ active sites and minimize the negative effect of H2O on ethane conversion, potentially leading to CO2-assisted dehydrogenation/aromatization of light alkanes. This journal is

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