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Efficient acylation of phenol with acetic anhydride using nanocrystalline hierarchical ZSM-5 catalyst

HSIU-LING HSU1, L. SELVA ROSELIN1, ROSILDA SELVIN1,* , UTTAM MAITY1

Affiliation

  1. Department of Chemical and Materials Engineering, Lunghwa University of Science and Technology, 300, Wan-shou Rd., Sec. 1, Kueishan, Taoyuan, Taiwan

Abstract

The current paper reports the activity of hierarchical ZSM-5 (Si/Al = 100) in the vapour phase acylation of phenol with acetic anhydride. The catalyst was characterized for its structural features by using X-ray diffraction, SEM, TEM and FTIR techniques. The reaction parameters, such as reaction temperature, phenol: acetic anhydride molar ratio and catalyst quantity were optimized. XRD analysis confirmed the formation of indicated that highly crystallized ZSM-5 zeolite without any impurities. The sample has a structure characteristic of MFI. The hierarchical nature of the catalyst sample was confirmed by SEM and TEM analysis. The average particle size was found to be around 40 to 50 nm and the nanocrystals were more or less spherical in shape. Catalytic activity of this catalyst showed that the phenol: acetic anhydride molar ratio had a remarkable influence on the acylation of phenol. Under the optimum reaction conditions (275°C, a Phenol: Acetic anhydride mole ratio of 1, and reaction time for 2 h), the hierarchical ZSM-5 catalyst showed high selectivity towards the formation of O-hydroxyacetophenone (o-HAP). The results show that the hierarchical ZSM-5 catalysts are very efficient and environmentally benign system for the acylation of phenol.

Keywords

ZSM-5, Acylation, Hierarchical zeolite, Phenol, Nanozeolite, Catalysis.

Submitted at: Dec. 14, 2010
Accepted at: June 9, 2011

Citation

HSIU-LING HSU, L. SELVA ROSELIN, ROSILDA SELVIN, UTTAM MAITY, Efficient acylation of phenol with acetic anhydride using nanocrystalline hierarchical ZSM-5 catalyst, Journal of Optoelectronics and Advanced Materials Vol. 13, Iss. 6, pp. 675-678 (2011)