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Acta Phys. -Chim. Sin.  2017, Vol. 33 Issue (6): 1236-1241    DOI: 10.3866/PKU.WHXB201703281
Article     
Influencing Mechanism of Cyclohexene on Thiophene Adsorption over CuY Zeolites
MO Zhou-Sheng1, QIN Yu-Cai2, ZHANG Xiao-Tong2, DUAN Lin-Hai2, SONG Li-Juan1,2
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
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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 wordsIn-situ FTIR spectroscopy      Brö      nsted acidity      Competitive adsorption      Anti-synergistic effect     
Received: 25 November 2016      Published: 28 March 2017
MSC2000:  O643  
Fund:  

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)

Corresponding Authors: SONG Li-Juan     E-mail: lsong56@263.net
Cite this article:

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. Acta Phys. -Chim. Sin., 2017, 33(6): 1236-1241.

URL:

http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/10.3866/PKU.WHXB201703281     OR     http://www.whxb.pku.edu.cn/Jwk_wk/wlhx/Y2017/V33/I6/1236

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