Abstract
The current paper reports the application of nanocrystalline form of zeolite ZSM-5 in lieu of Friedel Crafts catalysts in the benzylation of anisole using benzyl alcohol. There are many problems associated with the use and disposal of conventional catalysts due to their toxicity, corrosiveness and non-recyclability. Nanocrystalline zeolites can be a less polluting alternative to the conventional Friedel Crafts catalysts. Nanocrystalline ZSM-5 was synthesized by a facile method and was characterized using SEM, XRD and FTIR. The prepared nanocrystalline zeolite was then evaluated for its efficiency and selectivity in liquid phase benzylation of anisole. Optimum conditions of reaction time, temperature, quantity of catalyst and mole ratio of reactants were obtained. Kinetic studies were done to propose a mechanistic model for the catalyzed reaction. Results of this study suggest that the synthesized nanocrystals of zeolites are efficient, selective, stable, consistent and reusable catalysts. This catalyst thus holds the possibility of being a better alternative to homogeneous catalysts, from environmental and economic perspectives.
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