The green water-tolerant acid catalyst, periodic mesoporous H3PW12O40/SBA-15, has been prepared by a direct sol-gel co-condensation technique. The composite is an efficient and reusable solid catalyst for the condensation of phenol with a biomass-derived platform molecule, levulinic acid, to produce the important molecule diphenolic acid.
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Guo et al. (2007) studied this question.
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