Catalytic property
The liquid alkylation between benzene and 1-dodecene was performed in a three-necked round-bottom flask equipped with condensation under stirring condition. Prior to measurement, the resultant zeolite samples were ion exchanged three time with 1 M NH4NO3 solution at 80oC for 12 h, and benzene, 1-dodecene with ethyl cyclohexane was dried over 4A zeolite for 12 h. In a typical experiment, 0.1 g zeolite catalyst, 112 mmol benzene and 7.2 mmol ethyl cyclohexane was added into the flask, then the flask was stirred at 80oC for 0.5 h, subsequently 12.8 mmol 1-dodecene was added. This moment was marked as the initial reaction time. Liquid samples were withdrawn and analyzed by a gas chromatograph (Agilent 7890 A) equipped with a polyorganosiloxane capillary column (HP-5, 30.0 m × 0.32 mm, 0.25 μm) connected to a flame ionization detector (FID). For the recycling experiment, zeolites after cycle were filtered and dried at 120 ℃ for 12 h, then they were reused to evaluate the catalytic performance in next cycle without further treatment.