以四乙基氢氧化铵-四甲基氯化铵为模板剂水热法合成UZM-5沸石

Synthesis of UZM-5 Zeolite by a Hydrothermal Method Using Tetraethylammonium Hydroxide-Tetramethylammonium Chloride as Organic Templates

以四乙基氢氧化铵（TEAOH）-四甲基氯化铵（TMACl）为复合模板剂,采用静态水热法合成了UZM-5沸石.较为系统地考察了合成条件对UZM-5沸石的生长和晶化的影响,并采用X射线衍射、红外光谱和热重等手段对样品进行了表征.结果表明,在SiO2：（0.16-0.5）Al2O3：（0.4-1.0）TEAOH：（0.06-0.13）TMACl：20H2O的初始反应物摩尔比条件下,均能获得结晶良好的UZM-5沸石.适宜的晶化温度为403-423K,过高的晶化温度将导致无定形产物的生成.当以硅溶胶为硅源时,晶化只需2d,而以硅酸或硅胶为硅源时则分别需要4d和5d,过长的晶化时间导致杂晶方钠石的生成.Na＋的存在容易导致UZM-9沸石的生成,影响产物的相选择性.

The synthesis of UZM-5 zeolite by the hydrothermal method in the tetraethylammonium hydroxide（TEAOH）-tetramethylammonium chloride（TMACl） two-organic component system was studied.The products were characterized using X-ray diffraction,infrared spectroscopy,and thermogravimetry.The crystallization process and growth of UZM-5 zeolite were investigated.The results indicated that the UZM-5 zeolite could be synthesized when the initial mixture was SiO2：（0.16-0.5）Al2O3：（0.4-1.0）TEAOH：（0.06-0.13）TMACl：20H2O.Too high temperature was disadvantageous to the crystallization process.UZM-5 zeolite could be synthesized in the temperature range of 403-423 K.Too long time led to the crystallization of sodalite zeolite.The synthesis of UZM-5 zeolite with silica sol needs 2 days,while silicic acid 4 days and silica gel 5 days.A small amount of Na＋ ions resulted in the crystallization of UZM-9 zeolite and had an effect on the phase selectivity.