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Mesoporous H3PW12O40-silica composite: Efficient and reusable solid acid catalyst for the synthesis of diphenolic acid from levulinic acid

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JournalAPPLIED CATALYSIS B-ENVIRONMENTAL
DatePublished - 24 Jun 2008
Issue number3-4
Volume81
Number of pages10
Pages (from-to)182-191
Original languageEnglish

Abstract

Mesoporous H3PW12O40-silica composite catalysts with controllable H3PW12O40 loadings (4.0-65.1%) were prepared by a direct sol-gel-hydrothermal technique in the presence of triblock poly(ethylene oxide)-poly(propylene oxide)-poly (ethylene oxide) copolymer. Powder X-ray diffraction (XRD) patterns and nitrogen sorption analysis indicate the formation of well-defined mesoporous materials. With H3PW12O40 loading lower than 20%, the materials exhibit larger BET surface area (604.5-753.0 m(2) g(-1)), larger and well-distributed pore size (6.1-8.6 nm), larger pore volume (0.75-1.2 cm(3) g(-1)), and highly dispersed Keggin unit throughout the materials. Raman scattering spectroscopy studies confirm that the primary Keggin structure remained intact after formation of the composites. As a novel kind of reusable solid acid catalyst, as-prepared H3PW12O40-Silica composite was applied for the synthesis of diphenolic acid (DPA) from biomass platform molecule, levulinic acid (LA), under solvent-free condition, and remarkably high catalytic activity and stability were observed. (C) 2008 Elsevier B.V. All rights reserved.

    Research areas

  • diphenolic acid, biomass platform molecule, levulinic acid, mesoporous materials, heteropoly acids, sol-gel, PHOTOCATALYTIC DEGRADATION, HETEROPOLY COMPOUNDS, SILICA, SBA-15

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