XPS, XAES, and TG/DTA characterization of deposited carbon in methane dehydroaromatization over Ga-Mo/ZSM-5 catalyst

B. S. Liu*, L. Jiang, H. Sun, Chak Tong AU

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

69 Citations (Scopus)

Abstract

The catalytic dehydroaromatization of methane over 3.0%Mo/HZSM-5 and 0.1%Ga-3%Mo/HZSM-5 catalysts were reported. The nature of deposited carbon was characterized by means of XPS, XAES, TG/DTG, HRTEM, and DTA techniques. In XAES study, the type of deposited carbon was characterized based on the fine structures of dN/dE spectra. The results confirm that the sp 2 /sp 3 bonding ratio of coke species increases with on-stream time, suggesting that the deposition of heavier aromatic-type carbon is the main reason for catalyst deactivation. The addition of gallium to 3.0%Mo/HZSM-5 enhances the adsorption of CO x species as well as the formation of alkene (such as ethylene). Therefore, the Ga-modified 3%Mo/HZSM-5 catalyst is more active and stable than the unmodified one.

Original languageEnglish
Pages (from-to)5092-5100
Number of pages9
JournalApplied Surface Science
Volume253
Issue number11
DOIs
Publication statusPublished - 30 Mar 2007

Scopus Subject Areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

User-Defined Keywords

  • Carbon deposition
  • Derivative XAES
  • DTA
  • Ga-Mo/ZSM-5 catalyst
  • Suppression of coke
  • XPS

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