Abstract:
This research investigated the Boehmite catalysts modified with boron (B) and gallium (Ga) various amount of B and Ga at 0.5, 1.0 and 2.0 wt.%, respectively, the catalysts prepared by the wet impregnation method, And investigated the gamma alumina catalysts from the calcination at temperature 600 °C for 4 hours modified with B and Ga various amount of B and Ga at 0.5, 1.0 and 2.0 wt.%, then calcined at 500 °C for 4 hours. The catalysts were characterized by X-ray diffraction (XRD) Scanning electron microscopy (SEM) Energy dispersive X-ray spectroscopy (EDX) N2 physisorption (BET) and Temperature programmed desorption (NH3 -TPD). The results of all catalysts modified with B and Ga not affected the structure of crystalline and not changed the morphology but modification had influence with distribution of Ga loading, decreased surface area and increased surface acidity . The performance on dehydration of ethanol to ethylene at temperature ranging between 200 - 400 °C at atmospheric pressure for these catalysts was analyzed by gas chromatography. The result showed that the Boehmite catalysts with the highest both ethanol conversion and ethylene selectivity was Bm2.0B and Ƴ2.0B for the gamma alumina catalysts was observed due to its high dehydration ability because the medium-strong acid site was increased following B loading