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- W2059583697 abstract "Several mesoporous TaxW10−x mixed oxides prepared from TaCl5 and WCl6 in the presence of poly block copolymer surfactant Pluronic P-123 were examined as potential solid acid catalysts. Amorphous wormhole-type mesopores were observed in samples with x values from 3 to 10, whereas W-rich samples (x = 0−2) formed nonmesoporous structures with crystallized tungsten oxide (WO3). The acid strength increased with addition of W for mesoporous TaxW10−x oxides, and mesoporous Ta3W7 oxide exhibited the highest acid catalytic activity for the Friedel−Crafts alkylation of anisole and the hydrolysis of disaccharides. The results are compared with those of nonporous Ta2O5−WO3, HTaWO6 nanosheets, which were a solid acid obtained by exfoliation and aggregation of layered HTaWO6 with strong Brønsted acid sites in the interlayer, and a range of conventional solid acid catalysts. Mesoporous Ta−W oxides exhibited a turnover rate higher than that of nonporous Ta2O5−WO3 and HTaWO6 nanosheets, indicating that the mesoporous structure is an advantageous environment for the strong acid sites, because of the high surface area and easy reactant accessibility." @default.
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- W2059583697 date "2010-04-23" @default.
- W2059583697 modified "2023-10-01" @default.
- W2059583697 title "Synthesis and Characterization of Mesoporous Ta−W Oxides as Strong Solid Acid Catalysts" @default.
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- W2059583697 doi "https://doi.org/10.1021/cm903767n" @default.
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