12-Tungstophosphoric heteropoly acid (TPA) with a Keggin structure was introduced into Al-incorporated mesoporous molecular sieves (AlSBA-15) by the incipient wetness method.The materials were characterized by X-ray diffraction, nitrogen adsorption, scanning electron microscopy, UV-Vis diffuse reflectance and Raman spectroscopy, which confirmed the Keggin and mesopore structure.Its catalytic activity was evaluated under solvent-free conditions in the liquid phase at 333 - 383 K for the propionylation of anisole with propionic anhydride.The catalysts used were AlSBA-15, 10%, 20%, and 40%TPA/AlSBA-15, and 20%TPA/MCM-48.In the propionylation of anisole with propionic anhydride, the substitution occurred predominantly at the para position.The 20%TPA/AlSBA-15 catalyst gave a total product yield of 48% with 98% selectivity towards 4-methoxypropiophenone.The regenerability of the catalyst was also studied and was found to be excellent.
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