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International Journal of Advances in Science, Engineering and Technology(IJASEAT)-IJASEAT
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Volume Issue
Volume-7,Issue-2  ( Apr, 2019 )
Paper Title
Catalytic Ethanol Dehydration of Ethanol to Diethyl Ether Over Beta Zeolite with Different Mixed Na-H form in Catalysts
Author Name
Montri Thapplee, Bunjerdjongsomjit
Center of Excellence on Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Bangkok 10330 Thailand
In the present study, the catalytic ethanol dehydration to diethyl ether was investigated using beta zeolite catalysts with the Si/Al molar ratio of 13 having different Na and mixed Na-H form. First, the Na form of beta zeolite (Na-BEA) catalyst was synthesized by the hydrothermal process in an autoclave at 135°C for 20 h. Then, beta zeolite catalysts having different mixed Na-H forms was synthesized under ion-exchange conditions using the v/w ratio of 20 ml NH4NO3/g cat. under continues agitation at 70°C for 2 h/cycle. In this study, the cycle was chosen as one cycle (BEA-W1). These catalysts were characterized by various techniques including X-ray diffraction (XRD), N2 physisorption, scanning electron microscope (SEM) and ammonia temperature-programmed desorption (NH3-TPD). The dehydration reaction of ethanol in gas phase was performed in a fixed-bed continuous flow micro reactor using 100 mg of catalysts with1.45 ml/h (22.9 h-1 WHSV)at atmospheric pressure and the reaction temperature ranged from 150 to 400°C. The results presented that theBEA-W1 catalyst exhibited higher ethanol conversion than Na-BEA giving selectivity of 100% for diethyl ether at low temperature (150oC) because it has higher surface area and the optimal acid strength for catalyzing this reaction. Keywords - Beta zeolite, Diethyl ether, Ethanol dehydration, Zeolite
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