| 硅源量和晶化时间对SAPO-34分子筛结构和性能的影响 |
| Effects of Silicon Source Content and Crystallization Time on the Structure and Catalytic Performance of SAPO-34 Molecular Sieve |
|
| 摘要: 以吗啡啉为模板剂合成了SAPO-34分子筛，研究了晶化液SiO2/Al2O3比(硅源量)的影响。当SiO2/Al2O3 ≥ 0.6时，能合成出纯净的SAPO-34分子筛;SiO2/Al2O3=1.0时，分子筛骨架中出现“硅岛”结构，此时合成的分子筛样品具有最高的(乙烯+丙烯)选择性。继续增大硅铝比对(乙烯+丙烯 |
| 关键词: SAPO-34 硅源量 晶化时间 结构 催化性能 |
| 基金项目: |
| Abstract: SAPO-34 molecular sieve is synthesized using morpholine as the template. The effect of silicon content on structure and catalytic performance of SAPO-34 is investigated. When SiO2/Al2O3 ≥ 0.6 in the initial gel， pure SAPO-34 molecular sieve is obtained; When SiO2/Al2O3=1.0， “silicon island” forms and the sample synthesized has the highest (C2=+C3=) selectivity. However， when SiO2/Al2O3 value is increased to a value greater than 1.2， (C2=+C3=) selectivity decreases. The crystallization process of SAPO-34 is also investigated， and the results show that there is an optimal crystallization time， ca 36h; if the crystallization process continues after 36h， more or bigger “silicon island” would form and result in low (C2=+C3=) selectivity. |
| Keywords: SAPO-34 silicon source content crystallization time structure catalytic performance |
| |
| 摘要点击次数: 1242 |
| 全文下载次数: 1706 |
| 刘红星,谢在库,张成芳,陈庆龄,杨一青.硅源量和晶化时间对SAPO-34分子筛结构和性能的影响[J].无机化学学报,2003,19(3):240-246. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| Support information: |
|
|
|
|
|
|
