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