| Ω型分子筛脱铝的核磁共振研究 |
| NMR STUDIES ON DEALUMINATED ZEOLITE OMEGA |
|
| 摘要: 在不同投料比(SiO2/Al2O3=13.8,19及21)条件下,合成了三种Ω型分子筛原粉。对投料比为13.8的原粉样品进行了四种不同方式的脱铝处理,即水热、SiCl4、EDTA和(NH4)2SiF6处理,而形成了系列脱铝Ω型分子筛样品。对原粉及其脱铝样品进行了29Si和27AlMASNMR测试,确定出样品骨架 |
| 关键词: 脱铝Ω型分子筛 魔角旋转核磁共振 结晶学不等价四面体位 |
| 基金项目: |
| Abstract: Parent samples of zeolite omega are synthesized with different ratio of silicon aluminium source (SiO2 / Al2O3 = 13.8, 19.0 and 21.0, respectively). One of the parent samples (SiO2 / Al2O3 = 13.8)is then treated by thermal-steam, SiCl4, EDTA, (NH4)2SiF6 under different conditions.The series of treated samples are studies by NMR. The 27Al MAS NMR observations of the parent zeolite omega samples indicate that a preferenhal incorporation of the aluminium atoms in sites TB (located in the S6R) always occurred in our conditions of synthesis. The 29Si MAS NMR observations of the series dealuminated zeolite omega samples examine the dealuminating effects on the different condition of the thermal chemical treatmentS. There are experimental indications that in SiCl4 and EDTA-treated samples more TA (located in the S4R) Al atoms are removed from the framework of zeolite omega than TB Al atoms. However, the (NH4)2SiF6-treatment shows an opposite tendency. |
| Keywords: dealuminated zeolite omega crystallographically unequivalent tetrahedral sites MAS NMR |
| 投稿时间：1993-03-26 |
| 摘要点击次数: 1024 |
| 全文下载次数: 1189 |
| 周达明,李宝会,王建铭,金庆华,王敬中,胡澄.Ω型分子筛脱铝的核磁共振研究[J].无机化学学报,1994,10(2):160-164. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| Support information: |
|
|
|
|
|
|
