Coaromatization of methane and propane over Ga supported on HZSM-5 catalysts: The effect of mesoporosity on deactivation behavior

Min Yeong Gim, Yong Hyun Lim, Kwan Young Lee, Do Heui Kim

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Ga supported on mesoporous HZSM-5 (GaOy/meso-HZSM-5) and conventional HZSM-5 (GaOy/micro-HZSM-5) catalysts were compared to investigate the effect of mesoporosity on the deactivation behavior in the coaromatization of methane and propane. The trend of reaction intermediate distribution between the catalysts became gradually different with time-on-stream, implying a distinction in deactivation behavior. These are attributed to the behavior of acid site blockage, because the production of BTX are driven by acid sites. The reaction with 13CH4 and further analyses revealed that the interaction between coke and Ga species that serve as Lewis acid sites is much stronger in GaOy/micro-HZSM-5 than in GaOy/meso-HZSM-5 post-reaction catalyst. Therefore, large amount of highly condensed coke was deposited in GaOy/micro-HZSM-5 during the reaction, leading to fast catalyst deactivation. Consequently, the structural difference arising from mesoporosity affects physicochemical properties of the catalysts thereby contributing to different deactivation behavior between the catalysts.

Original languageEnglish
Article number121497
JournalFuel
Volume304
DOIs
Publication statusPublished - 2021 Nov 15

Keywords

  • Acid site blockage
  • Coaromatization of methane and propane
  • Coke analysis
  • Deactivation behavior
  • Ga supported on HZSM-5

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Organic Chemistry

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