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- W2251489504 abstract "A solid acid catalyst SO3/gamma-Al2O3 was prepared by adsorption of SO3 gas onto the surfaces of activated gamma-Al2O3. The structure and acidity of the catalyst were studied by XRD, NMR, FT-IR, TG-DTA and NH3-TPD method. The results indicated that SO3 reacted with activated gamma-Al2O3 to form a small quantity of Al-2(SO4)(3), and at the same time, the adsorption of SO3 on the surface of gamma-Al2O3 introduced two different kinds of Bronsted acid sites, which can be attributed to two different acid-hydroxyl groups, including the bridging hydroxyl groups (S-OH-Al, giving rise to an H-1 resonance at ca. delta 4.3) and the terminal hydroxyl groups attached to S atoms (S-OH, giving rise to an H-1 resonance at ca. delta 11.2). The structure of Bronsted acid sites on the surface of catalyst SO3/gamma-Al2O3 has been proposed based on H-1/Al-27 TRAPDOR and FT-IR results. The acid strength of SO3/gamma-Al2O3 is stronger than that of zeolite HZSM-5, but still weaker than that of SO42-/gamma-Al2O3, which is a conventional solid superacid catalyst." @default.
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- W2251489504 date "2005-02-28" @default.
- W2251489504 modified "2023-09-27" @default.
- W2251489504 title "Preparation of SO3/gamma-Al2O3 solid acid catalyst and characterization of its structure and acidity" @default.
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