State, activation, and migration of gallium in Ga H-MFI(Si,Al) propane aromatization catalysts

Sharifah Bee Abdul Hamid, Eric G. Derouane, Guy Demortier, Joseph Riga, Mohd. Ambar Yarmo

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

Several chemical, physical, and spectroscopic techniques were used to characterise the gallium-component in Ga/H-MFI(Si,Al) zeolitic propane aromatization catalysts, during their activation, stabilisation, and ageing with number of reaction-regeneration cycles. The initial gallium-modified catalysts prepared via ion exchange have a surface enriched in gallium as evidenced by X-ray photoelectron spectroscopy and Rutherford backscattering spectroscopy of alpha particles. The combination of reductive reaction and oxidative regeneration conditions leads to gallium migration and redistribution in the zeolite crystals, as well as to chemical change in the nature of the gallium species. Maximum activity and aromatics selectivity are observed when non-framework dispersed gallium-species have the highest concentration. They are associated with zeolite BrØnsted acidic sites as bifunctional dual sites.

Original languageEnglish
Pages (from-to)85-96
Number of pages12
JournalApplied Catalysis A, General
Volume108
Issue number1
DOIs
Publication statusPublished - 20 Jan 1994

Fingerprint

Aromatization
Propane
Gallium
Chemical activation
Catalysts
Zeolites
Alpha particles
Rutherford backscattering spectroscopy
Ion exchange
X ray photoelectron spectroscopy
Stabilization
Aging of materials
Crystals

Keywords

  • acidity
  • aging
  • gallium
  • propane aromatization
  • regeneration
  • zeolites

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

Cite this

State, activation, and migration of gallium in Ga H-MFI(Si,Al) propane aromatization catalysts. / Hamid, Sharifah Bee Abdul; Derouane, Eric G.; Demortier, Guy; Riga, Joseph; Yarmo, Mohd. Ambar.

In: Applied Catalysis A, General, Vol. 108, No. 1, 20.01.1994, p. 85-96.

Research output: Contribution to journalArticle

Hamid, Sharifah Bee Abdul ; Derouane, Eric G. ; Demortier, Guy ; Riga, Joseph ; Yarmo, Mohd. Ambar. / State, activation, and migration of gallium in Ga H-MFI(Si,Al) propane aromatization catalysts. In: Applied Catalysis A, General. 1994 ; Vol. 108, No. 1. pp. 85-96.
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