2.4. Preparation of HY zeolite
100 g of prepared NaY zeolite were mixed with 600 ml of 1 M
ammonium nitrate at 100 C for 4 h and stirred in a round bottom
flask fitted with a reflux condenser. NH4Y zeolite was recovered by
filtration, washed with deionized water and dried at 100 C for 6 h.
HY zeolite was prepared by stirring 40 g of the prepared NH4Y
zeolite with 800ml of 0.5 N oxalic acid at room temperature for 8 h.
HY zeolite was recovered by filtration, washed with deionized
water, dried at 100 C and calcined in air at 550 C for 5 h.