A novel solid acid catalyst, sulfonated chloromethyl polystyrene (CP) resin (CP-SO3H-1.69), was synthesized by partially substituting chlorine groups (Cl) of CP resin with sulfonic group(SO3H). This new type solid acid contains not only acid sites, but also cellulose-binding sites (Cl). A high yield of levulinic acid up to 65.5 % was obtained by converting microcrystalline cellulose over CP-SO3H-1.69. The high catalytic activity of CP-SO3H-1.69 was attributed to high amount of sulfonic group and chlorine on the catalyst, which is essential to keep the catalyst with great affinity to substrate.
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