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- W1979438013 abstract "Abstract Additional evidence is presented for the role of gallium reduction in preparing active Ga/ZSM-5 catalysts for alkane aromatization. The gallium in ion-exchanged ZSM-5, both with and without additional Ga 2 O 3 , can be reduced to Ga + , in the former case up to a limit determined by the number of anionic framework sites. An ion-exchanged, reduced catalyst exhibits similar redox behavior, and is as active for propane aromatization, as catalysts prepared from purely physical mixtures of Ga 2 O 3 and H-ZSM-5. Although reduction generates dispersed, active gallium species in zeolite channels, it is shown that for ethane dehydrogenation to aromatics the reduced (with hydrogen) Ga/ZSM-5 catalysts are not as active or selective as are materials which have been substantially reoxidized either by air or by traces of oxygen in inert gases. A combination of thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and X-ray diffraction (XRD) studies has been used to confirm that rapid reoxidation takes place at 550°C. However, the reoxidation does not regenerate β-Ga 2 O 3 , but rather a higher energy, dispersed Ga 3+ which appears to be optimal for production of aromatics from ethane. This form of Ga 3+ is stable under reaction conditio" @default.
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- W1979438013 date "1992-05-01" @default.
- W1979438013 modified "2023-09-25" @default.
- W1979438013 title "Effects of pretreatments on state of gallium and aromatization activity of gallium/ZSM-5 catalysts" @default.
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- W1979438013 doi "https://doi.org/10.1016/0926-860x(92)80336-b" @default.
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