Study on Hydrothermal Stability and Catalytic Activity of Al-SBA-15 Mesoporous Materials Prepared by

• 作 者: Fu Jiquan Li Meng
• 机 构: Center of Chemical Engineering, Beijing Key Lab., Beijing Institute of Fashion Technology, Beijing 1
• 出 处: 中国炼油与石油化工（英文版）
• 发表日期: 2011年3期
• 关键词: Al-SBA-15 zeolite mesoporous material hydrothermal stability acid site catalytic

The mesoporous Al-SBA-15 zeolite was obtained via impregnation of pure silica-based SBA-15 zeolite with aluminum nitrate.The Al-SBA-15 sample was calcined in air at 800 ℃ for 6 h and hydrothermally treated at near 100 ℃ for 120 h,respectively,and then the thermal and hydrothermal stability of Al-SBA-15 sample was investigated by X- ray diffractometry (XRD),scanning electron microscopy (SEM),transmission electron microscopy (TEM) and nitrogen adsorption and desorption techniques.The Al-SBA- 15 sample was also studied by 27Al nuclear magnetic resonance (27A1 NMR) and ammonia temperature programmed desorption (NH3-TPD) techniques.In addition,the catalytic activity of Al-SBA-15 zeolite was investigated by the Friedel-Crafts reactions of 2,4-di-tert-butylphenol with cinnamyl alcohol.The test results showed that the thermal and hydrothermal stability of Al-SBA-15 zeolite was better than that of SBA-15 zeolite.The Al-SBA-15 zeolite sample prepared by impregnation method exhibits more framework aluminum species and Al-O-Si units.Therefore,the number of the surface hydroxyl groups was reduced,resulting in the stabilization of framework structure of A1-SBA-15 zeolite.The aluminum species can form weak and medium-strong acid sites with catalytic activity.