摘要
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.
12-Tungstophospboric heteropoly acid （TPA） with a Keggin structure was introduced into Al-incorporated mesoporous molecular sieves （AISBA-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 AISBA-15, 10 % , 20 % , and 40 % TPA/AISBA-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/AISBA-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.
出处
《催化学报》
SCIE
EI
CAS
CSCD
北大核心
2008年第12期1202-1210,共9页
关键词
AISBA-15
接触反应
活性
乙酰化作用
heteropoly acid
mesopore
AISBA-15
anisole
propionic anhydride
propionylation
