Hodala, Janardhan L and Halgeri, A B and Shanbhag, Ganapati V (2014) Phosphate modified ZSM-5 for the shape-selective synthesis ofpara-diethylbenzene: Role of crystal size and acidity. Applied Catalysis A: General, 484. pp. 8-16.

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Abstract

Pore engineered ZSM-5 zeolite in extrudate form was prepared and used as shape-selective catalyst forvapor phase ethylation of ethylbenzene to selectively form para-diethylbenzene. The physico-chemicalproperties of the catalyst were established by XRD, N2sorption, FTIR, FESEM, NH3-TPD and31P MAS NMR.Alkylation of ethylbenzene with ethanol was carried out in a continuous, down-flow, tubular reactor, atatmospheric pressure and H2as a carrier gas in vapor phase. Effect of silica to alumina ratio (SAR), crystalsize, acidity of phosphate modified ZSM-5, stepwise phosphate modification and reaction conditions werestudied in detail. ZSM-5 with SAR 187 was found to contain optimum acidity for phosphate modification toachieve good conversion and high selectivity for p-diethylbenzene. Under optimized reaction conditions,viz. temperature = 380◦C, ethylbenzene:ethanol mole ratio = 4:1, WHSV = 3 h−1, H2/reactants = 2, 5PZSM-5 W catalyst gave 22.8% of ethylbenzene conversion with ∼98% selectivity for para-diethylbenzene.

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