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- W2384145152 abstract "Tungsten oxide modified titania solid superacid catalysts were prepared by impregnation of TiO2·xH2O powder in ammonium metatungstate aqueous solution and calcination in air with high temperature. The modified catalysts prepared were characterized by NH3-TPD, FT-IR of pyridine adsorption, XRD and LRS. The results show that the small amount addition of tungsten oxide can remarkably increase the acidity and the acid strength of the modified catalysts prepared, both the Lewis and Bronsted acid sites exist on the surface of the modified catalysts and these two species of acid sites are interchangeable. It was also found that, when the addition amount of tungsten oxide is less than 15% of the weight of modified catalyst, the interaction between tungsten oxide and TiO2 stabilizes the tungsten oxide species, forms good dispersion of tungsten oxide on the surface of TiO2 support and hinders the transition of TiO2 from anatase to rutile phase. The surface area, pore volume, pore diameter and acidity of the catalyst increase with the content of the tungsten oxide. The tungsten oxide modified titania solid superacid catalyst has good catalytic performance for the esterification of ethane diacid and isopentyl alcohol. However when the content of tungsten oxide is over 15%(wt) with the calcination temperature over 500℃, the crystal phase of WO3 will appear and the specific surface area, acidity and the acid strength of the modified catalysts decrease." @default.
- W2384145152 created "2016-06-24" @default.
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- W2384145152 date "2008-01-01" @default.
- W2384145152 modified "2023-09-24" @default.
- W2384145152 title "Studies on Tungsten Oxide Modified Titania Solid Superacid Catalysts" @default.
- W2384145152 hasPublicationYear "2008" @default.
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