噻吩在稀土离子改性Y型分子筛上吸附与催化转化研究

秦玉才; 高雄厚; 裴婷婷; 郑兰歌; 王琳; 莫周胜; 宋丽娟

噻吩在稀土离子改性Y型分子筛上吸附与催化转化研究

1.
中国石油大学(华东) 化学化工学院, 山东青岛 266555;
2.
辽宁石油化工大学辽宁省石油化工重点实验室, 辽宁抚顺 113001;
3.
中国石油天然气股份有限公司石油化工研究院兰州化工研究中心, 甘肃兰州 730060

基金项目: 国家重点基础研究发展规划(973计划, 2007CB216403); 国家自然科学基金(20976077, 21076100); 中国石油天然气股份有限公司(10-01A-01-01-01).

详细信息

通讯作者:
宋丽娟

中图分类号: TE626.21
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出版历程
- 收稿日期: 2013-05-29
- 修回日期: 2013-06-20
- 刊出日期: 2013-07-30

Adsorption and catalytic conversion of thiophene on Y-type zeolites modified with rare-earth metal ions

1.
College of Chemistry & Chemical Engineering, China University of Petroleum (East China), Qingdao 266555, China;
2.
Key Laboratory of Petrochemical Catalytic Science and Technology, Liaoning Province, Liaoning Shihua University, Fushun 113001, China;
3.
Lanzhou Petrochemical Research Center, Petrochemical Research Institute, Petro China Company Limited, Lanzhou 730060, China

摘要

摘要: 以NaY、HY、液相Ce离子交换改性Y分子筛(L-CeY)和稀土离子改性超稳Y分子筛(HRSY-3)为研究对象,运用XRD、N₂吸附、NH₃-TPD和Py-FTIR表征样品的物化性能;采用原位红外光谱技术与程序升温脱附-同步质谱检测联用技术(TPD-MS)研究噻吩在活性中心上的吸附及催化转化行为.结果表明,稀土离子改性不改变分子筛晶体的基本结构但改变其精细结构,并形成一定的介孔,同时降低分子筛强酸位的强度,并生成与稀土离子物种有关的弱L酸位.REY与HY均可通过B酸中心的质子化作用活化噻吩,而稀土离子物种促进氢转移反应及低聚反应的进行,进而利于噻吩裂化反应的进行.
- 噻吩 /
- REY /
- 吸附 /
- 氢转移 /
- 催化裂化
Abstract: Rare earth metal modified Y zeolites (L-CeY) and USY zeolites (HRSY-3) were characterized by XRD, N₂ adsorption, NH₃-TPD, and in-situ Py-FTIR; the adsorption and catalytic conversion behavior of thiophene on the modified zeolites were investigated by using the in situ FT-IR combined with TG-MS analysis. The results indicated that the original crystal structures of the zeolites remain unchanged after the modification with the rare earth metal ions; however, the modification results in the formation of partial mesoporous structure and weak Lewis acid sites related to the rare-earth ion species as well as certain decrease of the acidic strength of the strong acid sites. Thiophene molecules can be activated via protonization upon the Brönsted acid sites of the USY and HY zeolites; however, the rare earth metal ions are able to promote the hydrogen transfer and oligomerization reactions, which can then enhance the catalytic cracking of thiophene reactions.
- thiophene /
- REY /
- adsorption /
- hydrogen transfer /
- catalytic cracking

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参考文献(22)

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