甲基噻吩在HY分子筛上的吸附、脱附及转化行为

赵胜楠; 莫周胜; 秦玉才; 宋艳芬; 石利飞; 朱萌萌; 宋丽娟; 段林海

甲基噻吩在HY分子筛上的吸附、脱附及转化行为

1.
辽宁石油化工大学辽宁省石油化工催化科学与技术重点实验室, 辽宁抚顺 113001;
2.
中国石油大学(华东) 化学化工学院, 山东青岛 266555

基金项目: 国家自然科学基金(21476101, 21376114); 辽宁省自然科学基金(2013020122); 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, E-mail: lsong56@263.net; 段林海, E-mail: lhduan@126.com, Fax: +86 24 56860658。

中图分类号: O643
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出版历程
- 收稿日期: 2014-10-27
- 刊出日期: 2015-05-30

Adsorption, desorption and conversion of methylthiophene on HY zeolite

1.
Key Laboratory of Petrochemical Catalytic Science and Technology, Liaoning Province, Liaoning Shihua University, Fushun 113001, China;
2.
College of Chemistry & Chemical Engineering, China University of Petroleum (East China), Qingdao 266555, China

摘要

摘要: 由NH₄Y分子筛制备了HY分子筛,运用N₂吸附、NH₃-TPD和Py-FTIR等手段表征HY分子筛的物化性能;采用智能重量分析仪(IGA)方法研究了甲基噻吩(2-甲基噻吩、3-甲基噻吩)在HY分子筛上的吸附-脱附行为;采用程序升温脱附-质谱(TPD-MS)联用手段研究了甲基噻吩在HY分子筛上的转化行为。结果表明,在200 ℃下 2-甲基噻吩和3-甲基噻吩在HY分子筛中的强B酸上发生强化学吸附作用,与B酸结合后生成了甲基噻吩的碳正离子结构进而发生了歧化反应、脱烷基反应以及裂化反应;与2-甲基噻吩不同的是,3-甲基噻吩与HY通过一定的氢转移反应生成了3-甲基四氢噻吩,且200 ℃吸附条件下3-甲基噻吩比2-甲基噻吩更容易发生裂化反应。
- 甲基噻吩 /
- HY /
- 吸附 /
- 歧化 /
- 脱烷基 /
- 催化裂化
Abstract: HY zeolite obtained from NH₄Y was characterized by N₂ physisorption, NH₃-TPD, and in-situ Py-FTIR. The adsorption, desorption, and conversion of methylthiophene on the HY zeolite was investigated by using the intelligent gravimetric analysis (IGA) and temperature programmed desorption-mass spectrum (TPD-MS). The results indicated that 2-methylthiophene and 3-methylthiophene are strongly chemisorbed on the strong Brnsted acid sites of HY zeolite, which promote the disproportionation, dealkylation and cracking reactions at 200 ℃. Compared with 2-methylthiophene, 3-methylthiophene is prone to crack and form 3-methyltetrahydrothiophene via the hydrogen transfer reactions.
- methylthiophene /
- HY zeolite /
- adsorption /
- disproportionation /
- aealkylation /
- catalytic cracking

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