MATERIALS AND METHODS
Catalyst Synthesis: The zeolite catalyst is prepared by adopting a method developed by [14]. A solution of 360g water glass (28.8% SiO , 8.9% Na O and 62.4% H O) and 450 g H O which was denoted as A was prepared. Meanwhile, another solution consisted of 12.3 g Al (SO ) 18H O, 30 g H SO 98% and 600 g H O denoted as B was also prepared. Solution B then was added slowly to solution A and stirred with a magnetic stirrer until a white gel was produced. To produce a smooth and homogenous gel, the white gel was stirred for another 1 h. Then to the homogenous gel, 124 g ethanol was added slowly. The mixture was stirred continuously for 1 h. The pH of the gel is between 10-11, if the pH is not in those ranges either H SO or NaOH solution was added. The gel with SiO /Al O ratio 94 was then heated at 176°C, stirred at 100 rpm for 24 h in an autoclave. The crystal produced then was filtered and washed with distilled water until the pH of the filtrate was 8. The crystal was then dried in an oven at 110°C for 24 h. The crystal produced was NawithZeolite or so called ZSM-5.