Preparation of Ga-Doped Zeolite Catalysts Via Hydrogen Induced Solid State Interaction Between Ga2O3 and HZSM-5 ZEOLITE

Document Type

Article

Publication Date

1-1-1991

Abstract

Ga-doped catalysts were prepared by mechanical mixing of β Ga2O3 and HZSM-5 zeolite. Several physical methods (XRD, XPS, IR, TPR, TEM/EDAX) unanbiguously evidence that in the presence of H2 Ga2O3 reduction process occurs leading to gradual depletion of the β Ga2O3 crystalline phase and simultaneous transfer of the gallium species into the zeolite. The formation of Ga2O is considered as the first step of the reduction process. The zeolite acidity seems to be the most important factor in facilitating this process via trapping in cationic zeolite positions of gallium species in a lower (probably Ga+) oxidation state. The role of the hydrogen reduction in creating of a new active state of Ga-containing zeolites is confirmed by the dramatic enhancement of propane and n-pentane aromatization activity as well as by the strong increase in the ethylbenzen conversion. © 1991, Elsevier Science & Technology. All rights reserved.

Publication Source (Journal or Book title)

Studies in Surface Science and Catalysis

First Page

277

Last Page

285

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