Catalysis Database

Sulfated CexZr1−xO2 solid acid catalyst for solvent free synthesis of coumarins

Benjaram M , Reddy and Meghshyam K, Patil and Pandian, Lakshmanan (2006) Sulfated CexZr1−xO2 solid acid catalyst for solvent free synthesis of coumarins. Journal of Molecular Catalysis A: Chemical , 256 . pp. 290-294.

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Abstract

A novel SO4 2−/CexZr1−xO2 catalyst has been employed for Pechmann condensation of phenols under solvent-free conditions. Catalyst loads as lowas 10 wt.% could be used leading to high yields with activated phenols at an oil bath temperature of 393 K.To make the catalyst, Ce–Zr–hydroxide gel was prepared by a coprecipitation method and SO4 2− ions were deposited by treating the gel with sulfuric acid and calcined at 923 K. Surface and bulk properties of the catalyst was investigated by means of X-ray powder diffraction, ammonia-temperature programmed desorption, Raman spectroscopy, and BET surface area methods. Characterization results reveal the super acidic nature of the catalyst. The methodology presented offers significant improvements for the synthesis of coumarins with regard to yield of products, simplicity in operation, and green aspects by avoiding toxic conventional catalysts and solvents.

Item Type:Article
Subjects:Science > Chemistry
ID Code:664
Deposited By:Mr Magesh ganesan
Deposited On:30 Apr 2007 21:20
Last Modified:30 Apr 2007 21:20

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