12-钨磷酸在AlSBA-15上的固定化及其乙酰化催化活性

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.

Immobilization of 12-Tungstophosphoric Acid on AlSBA-15 and Its Catalytic Activity for Acetylation

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.