催化学报

催化学报 ›› 2008, Vol. 29 ›› Issue (12): 1202-1210.

• 研究论文 • 上一篇    下一篇

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

Immobilization of 12-S. REVATHI1,2, M. Esther Leena PREETHI1, D. MANIKANDAN1, D. DIVAKAR1, A. Valentine RUPA1,   

  1. 1 Department of Chemical Engineering, A. C. College of Technology, Anna University, Chennai600020, India; 2 Graduate, College of Engineering, Anna University, Chennai600020, India
  • 收稿日期:2008-12-25 出版日期:2008-12-25 发布日期:2012-09-20

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

Immobilization of 12-S. REVATHI1,2, M. Esther Leena PREETHI1, D. MANIKANDAN1, D. DIVAKAR1, A. Valentine RUPA1,   

  1. 1 Department of Chemical Engineering, A. C. College of Technology, Anna University, Chennai600020, India; 2 Graduate, College of Engineering, Anna University, Chennai600020, India
  • Received:2008-12-25 Online:2008-12-25 Published:2012-09-20

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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.

关键词: heteropoly acid, mesopore, AlSBA15, anisole, propionic anhydride, propionylation

Abstract: 12-Tungstophosphoric acid with Keggin structure was introduced onto the Al-inc or porated mesoporous molecular sieves (AlSBA-15) by the incipient wetness method. The materials were characterized by XRD, nitrogen adsorption, HRTEM, and UV-Vis diff use reflectance to confirm the existence of Keggin and mesopore structure. HRTEM images showed the good dispersity of the species into the mesopore region.

Key words: heteropoly acid, mesopore, AlSBA15, anisole, propionic anhydride, propionylation