环己烯对噻吩在CuY分子筛上吸附的影响机制

引用本文: 莫周胜, 秦玉才, 张晓彤, 段林海, 宋丽娟. 环己烯对噻吩在CuY分子筛上吸附的影响机制[J]. 物理化学学报, 2017, 33(6): 1236-1241. doi: 10.3866/PKU.WHXB201703281 shu

Citation: MO Zhou-Sheng, QIN Yu-Cai, ZHANG Xiao-Tong, DUAN Lin-Hai, SONG Li-Juan. Influencing Mechanism of Cyclohexene on Thiophene Adsorption over CuY Zeolites[J]. Acta Physico-Chimica Sinica, 2017, 33(6): 1236-1241. doi: 10.3866/PKU.WHXB201703281 shu

环己烯对噻吩在CuY分子筛上吸附的影响机制

1.
中国石油大学(华东)化学工程学院, 山东青岛 266555;
2.
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
基金项目:
国家自然科学基金（21376114，21476101）和中国石油天然气股份有限公司炼油催化剂重大专项（10-01A-01-01-01）资助项目

摘要: 利用液相离子交换法制备了CuY分子筛，并用X射线光电子能谱分析（XPS）对Cu元素进行了价态表征，用原位傅里叶转换红外（in-situ FTIR）和氨气程序升温脱附（NH₃-TPD）技术对其进行了酸性表征。同时，以噻吩和环己烯为探针分子，CuY分子筛为吸附剂，研究了环己烯对噻吩在CuY分子筛B酸中心上吸附的影响机制。实验结果显示，CuY分子筛表层的Cu离子主要以Cu⁺为主，其表面酸性主要由中强B酸和L酸组成。与稀土离子不同的是，铜离子的存在抑制了噻吩或环己烯在B酸中心上的聚合反应。因此，环己烯主要通过与噻吩的竞争吸附影响噻吩在CuY分子筛B酸性位上的吸附。

关键词:

English

Influencing Mechanism of Cyclohexene on Thiophene Adsorption over CuY Zeolites

1.
College of Chemistry & Chemical Engineering, China University of Petroleum(East China), Qingdao 266555, Shandong Province, P. R. China;
2.
Key Laboratory of Petrochemical Catalytic Science and Technology of Liaoning Province, Liaoning Shihua University, Fushun 113001, Liaoning Province, P. R. China
Received Date: 25 November 2016
Revised Date: 10 March 2017
Available Online: 28 March 2017
Fund Project:
The project was supported by the National Natural Science Foundation of China (21376114, 21476101) and Major Program of Petroleum Refining of Catalyst of PetroChina Company Limited (10-01A-01-01-01)

Abstract: A CuY zeolite prepared by liquid phase ion exchange was characterized by X-ray photoelectron spectroscopy, pyridine in situ Fourier transform infrared (in situ FTIR) spectroscopy, and ammonia temperature programmed desorption. The effect of cyclohexene on the adsorption of thiophene over the prepared CuY zeolite was explored by in situ FTIR. In particular, the role of the zeolite's Brönsted acidity was investigated in the adsorption process. The results show that the percentage of Cu⁺ on the surface of the CuY zeolite can reach 77%. The surface acidity of the CuY zeolite mainly comprises medium and strong Brönsted acidity and Lewis acidity. According to the adsorption results, cyclohexene negatively influences thiophene adsorption on the Brönsted or Lewis acid sites in CuY by competitive adsorption. Although polymerization of thiophene and cyclohexene can occur easily on the HY or REY zeolites, the presence of Brönsted acids in the CuY zeolite was not sufficient to polymerize either thiophene or cyclohexene. This difference may be caused by an anti-synergistic effect between the Cu ions of the CuY zeolite and neighboring Brönsted acid sites, the result of which inhibits the polymerization of adsorbed thiophene and cyclohexene.

Key words:

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

环己烯对噻吩在CuY分子筛上吸附的影响机制

English

Influencing Mechanism of Cyclohexene on Thiophene Adsorption over CuY Zeolites

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

环己烯对噻吩在CuY分子筛上吸附的影响机制

English

Influencing Mechanism of Cyclohexene on Thiophene Adsorption over CuY Zeolites

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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