Lewis acidity of gallium-containing pentasils

Миначев, Х. М.; Kharson, M. S.; Dergachev, A. A.; Gorbatkina, I. E.; Tyurin, A. A.; Bondarenko, T. N.; Konoval'chikov, L. D.; Nefëdov, B. K.

doi:10.1007/bf01184553

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Stability Of Gallium In Tetrahedral Framework Positions1

Characterization Of Brønsted Acidity In Gallosilicates1

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2000

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“…An IR vibration band at 1461 cm -1 appears after adsorption of pyridine over hydrothermally treated [Ga]-ZSM-5 gallosilicates. This band is assigned to Lewis acid sites located on nonframework gallium species. Khodakov et al observed the release of gallium from the framework of gallosilicates with MFI structure during catalyst regeneration.…”

Section: Stability Of Gallium In Tetrahedral Framework Positionsmentioning

confidence: 99%

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Incorporation of Gallium into Zeolites: Syntheses, Properties and Catalytic Application

et al. 2000

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Section: Stability Of Gallium In Tetrahedral Framework Positionsmentioning

confidence: 99%

“…Depending on the temperature of the preliminary treatment, concentrations of Lewis and Brønsted acid sites of H-ZSM-5, Ga-ZSM-5, and Zn−ZSM-5 can vary in a wide range . The ratio of Lewis-to-Brønsted acid sites of H-ZSM-5 increases after impregnation with Ga or Zn (1−5 wt % Ga and Zn).…”

Section: Characterization Of Brønsted Acidity In Gallosilicatesmentioning

confidence: 99%