| 王宝杰,赵红娟,王久江,杨周侠,滕秋霞,曾鹏晖.三种不同拓扑结构的分子筛在甲醇制烯烃反应中的性能对比[J].分子催化,2018,32(6):493-500 |
| 三种不同拓扑结构的分子筛在甲醇制烯烃反应中的性能对比 |
| Comparative Study of Three Zeolites with Different Topologies （SAPO-34, Al-ITQ-13 and ZSM-5） in MTO Reaction |
| 投稿时间：2018-08-11 修订日期：2018-10-20 |
| DOI： |
| 中文关键词: SAPO-34 ZSM-5 Al-ITQ-13 MTO 拓扑结构 |
| 英文关键词:SAPO-34 ZSM-5 Al-ITQ-13 MTO topology |
| 基金项目:国家自然科学基金（Nos.U1462202）资助. |
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| 摘要点击次数: 1900 |
| 全文下载次数: 1910 |
| 中文摘要: |
| 采用XRD、SEM、N2吸附-脱附、NH3-TPD研究了3种不同拓扑结构的分子筛SAPO-34、Al-ITQ-13和ZSM-5分子筛的孔结构、酸性分布对其甲醇制低碳烯烃中反应性能的影响.结果表明，SAPO-34对乙烯具有最好选择性，可达52.3%；ZSM-5和Al-ITQ-13则对丙烯具有良好的选择性可达50.3%和50.0%，丙烯选择性相当，但兼顾乙烯时，Al-ITQ-13较ZSM-5高，可达18.4%.3种分子筛反应性能的差异主要是其拓扑结构的不同引起的.孔道结构越小则越有利于小分子产物的生成，具有八元环结构的SAPO-34分子筛对小分子乙烯具有最高的选择性，而同时具有九元环和十元环结构的Al-ITQ-13由于孔道中含有一套九元环结构，使其与ZSM-5分子筛相比，在丙烯选择性相当的情况下，小分子产物乙烯明显增加. |
| 英文摘要: |
| Three zeolites with different topologies, SAPO-34, Al-ITQ-13 and ZSM-5, were comparatively studied in methanol to olefins (MTO). The results showed that SAPO-34 presented the highest selectivity for ethylene, up to 52.3%, while ZSM-5 and Al-ITQ-13 showed higher selectivity for propylene, up to 50.3% and 50.0% respectively. But taking consideration of ethylene, Al-ITQ-13 had higher selectivity than ZSM-5, more than 10.7%. The dissimilarity in MTO performances was mainly due to the differences of their topologies. The smaller pore structure of zeolite was more favorable for the product with smaller size. SAPO-34 with 8-membered ring topology had smallest pore structure and its ethylene selectivity was the highest among the three zeolites. Al-ITQ-13 had one set of interconnecting channel of 9-membered ring, compared to ZSM-5, and it had higher selectivity for ethylene as well as similar selectivity for propylene. |
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