Eurasian Chemico-Technological Journal (Jan 2010)

Structural Changes of Mo/ZSM-5 Catalysts During the Methane Dehydroaromatization

  • Z. R. Ismagilov,
  • E. V. Matus,
  • I. Z. Ismagilov,
  • M. A. Kerzhentsev,
  • V. I. Zaikovskii,
  • K. D. Dosumov,
  • A. G. Mustafin

DOI
https://doi.org/10.18321/ectj20
Journal volume & issue
Vol. 12, no. 1
pp. 9 – 16

Abstract

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The structure changes of Mo/ZSM-5 catalysts with different Mo content (2 and 10 wt. % Mo) and Si/Al atomic ratio (17, 30 and 45) during the methane dehydroaromatization have been investigated by X-ray powder diffractometry, N2 adsorption and transmission electron microscopy. The treatment of Mo/ZSM-5 catalysts in reducing atmosphere (CH4 or H2) at about 700 oC promotes development of mesoporous system. The pores are open to the exterior of the zeolite grain and have an entrance diameter of ~ 4-10 nm. It is proposed that mesopore formation in Mo/ZSM-5 catalyst is connected with the dealumination of zeolite. The mesopore formation in the parent H-ZSM-5 zeolite by NaOH treatment does not improve the activity of /ZSM-5 catalyst.