Synthesis of p-Methoxyacetophenone Catalyzed by Phosphoric Acid Modified Hβ Zeolite

p-Methoxyacetophenone was synthesized by the Friedel-Crafts acylation of anisole and acetic anhydride over the phosphoric acid modified Hβ zeolite.The effect of phosphoric acid modification was investigated based on XRD and NH3-TPD characterization.The influences of the reaction temperature,the catalyst amount and the reaction time on the acetic anhydride conversion were investigated and optimized.The conversion of acetic anhydride and the selectivity to p-methoxyacetophenone are both higher than 99.0% in four runs catalyzed by the recycled catalysts under the optimum reaction conditions,while the reaction temperature is 120 ℃,the catalyst amount is 2.0 g and the reaction time is 2 h.