Abstract:

Binary structure zeolites Y/SAPO-5 were synthesized by hydrothermal synthesis method, with phosphoric acid, pseudoboehmite, and silica sol being used as phosphorus, aluminum, and silicon sources, respectively, and triethylamine as template. The samples obtained were characterized by means of XRD, FT-IR and SEM. The results indicate that the synthesized zeolite samples is the binary structural microspheres with NaY zeolites as core and SAPO-5 as shell about 10 μm. The catalytic performance was investigated by the synthesis of dimethyl ether from methanol. The experiments of the catalysis of dimethyl ether show that Y/SAPO-5 exhibited excellent selectivity of DME, with the increase of conversion of methanol over the temperature range 463～523 K.

Key words:

Y zeolite,   ,  SAPO-5 zeolite,   ,  Hydrothermal synthesis method,   ,  Binary structure zeolitemso-ascii-font-family: Calibri, mso-ascii-theme-font: minor-latin, mso-fareast-font-family: 宋体, mso-fareast-theme-font: minor-fareast, mso-hansi-font-family: Calibri, mso-hansi-theme-font: minor-latin">

摘要： 以磷酸、拟薄水铝石和硅溶胶为原料, 三乙胺为模板剂, 采用水热合成法合成Y/SAPO -5 复合分子筛。利用XRD、FT -IR、SEM 等手段对样品结构和形貌进行了表征, 所合成的分子筛是Y 型分子筛晶粒被SAPO - 5 分子筛晶粒包裹形成的10 μm 左右的球状双结构复合分子筛。采用催化甲醇脱水制备二甲醚的反应考察了复合分子筛的催化性能, 结果表明, 对于催化甲醇脱水制备二甲醚的反应所合成的复合分子筛在温度为463 ～ 523 K 时随温度升高甲醇转化率增大, 且仍保持着较高的DME 选择性。

关键词: Y 分子筛 , SAPO-5 分子筛 , 水热合成法 , 复合分子筛