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Multifunctional mesoporous solid acids were prepared by the sulfonation of carbonized de-oiled seed waste cake (DOWC), a solid waste from biodiesel production. Detailed structural characterization of the materials by elemental analysis, FT-IR, Raman, XRD, XPS, TGA, NH 3 -TPD and N 2 -physisorption showed that they were structurally different from the carbohydrate and resin based sulfonated...
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