Influence of olefin on the mechanism of thiophene adsorption on the active species of Al-MCM-41 mesoporous zeolites

GUO Zhong-sen; ZU Yun; HUI Yu; QIN Yu-cai; WANG Huan; ZHANG Xiao-tong; SONG Li-juan

Volume 47 Issue 4

Apr. 2019

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Article Navigation > Journal of Fuel Chemistry and Technology > 2019 > 47(4): 474-483

GUO Zhong-sen, ZU Yun, HUI Yu, QIN Yu-cai, WANG Huan, ZHANG Xiao-tong, SONG Li-juan. Influence of olefin on the mechanism of thiophene adsorption on the active species of Al-MCM-41 mesoporous zeolites[J]. Journal of Fuel Chemistry and Technology, 2019, 47(4): 474-483.

Citation:

GUO Zhong-sen, ZU Yun, HUI Yu, QIN Yu-cai, WANG Huan, ZHANG Xiao-tong, SONG Li-juan. Influence of olefin on the mechanism of thiophene adsorption on the active species of Al-MCM-41 mesoporous zeolites[J]. Journal of Fuel Chemistry and Technology, 2019, 47(4): 474-483.

Citation:

GUO Zhong-sen, ZU Yun, HUI Yu, QIN Yu-cai, WANG Huan, ZHANG Xiao-tong, SONG Li-juan. Influence of olefin on the mechanism of thiophene adsorption on the active species of Al-MCM-41 mesoporous zeolites[J]. Journal of Fuel Chemistry and Technology, 2019, 47(4): 474-483.

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Influence of olefin on the mechanism of thiophene adsorption on the active species of Al-MCM-41 mesoporous zeolites

GUO Zhong-sen¹,
ZU Yun^{1, 2},
HUI Yu^{1, 2},
QIN Yu-cai¹,
WANG Huan^{1, 2},
ZHANG Xiao-tong¹,
SONG Li-juan^{1, 2
,
,}

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

Funds:

the National Natural Science Foundation of China U1662135

the National Natural Science Foundation of China 21376114

Liaoning Province, PhD Research Initiated Fund Project 201601318

More Information

Corresponding author: SONG Li-juan, Tel: 13941350056, E-mail: lsong56@263.net
Received Date: 2018-12-05
Rev Recd Date: 2019-01-27

Available Online: 2021-01-23

Publish Date: 2019-04-10

Abstract

Abstract

The Al-MCM-41 zeolites with different Al contents were prepared by post-grafting method and characterized by means of XRD, N₂ adsorption-desorption, NH₃-TPD, and Py-FTIR. The adsorptive performance of thiophene on these samples was investigated in a fixed bed by using micro coulombmeter and GC-SCD technique. The thiophene adsorption capacity was correlated with the acid properties and texture properties of the molecular sieve, and the effect of olefin on the adsorption desulfurization mechanism of active species in Al-MCM-41 was investigated. The results show that the introduction of lower content aluminum species is conducive to the formation of B (Brønsted) acid center and L₁ (Lewis) acid center, while higher content aluminum species is conducive to the formation of L₂ (Lewis) acid center. L₂ acid center exhibits a far stronger thiophene adsorption ability than L₁ acid center that has a slightly stronger thiophene adsorption ability than B acid center. Competitive adsorption and catalytic conversion of olefin and thiophene take place on the B acid center, and the catalytic reaction is dominated. The existence of L₂ acid center greatly promotes the catalytic conversion reaction on the B acid center. The adsorption of macromolecular sulfide instead of thiophene increases the saturated adsorption capacity of Al-MCM-41 zeolites.
- Al-MCM-41 zeolite,
- thiophene,
- olefin,
- acid active center,
- adsorption desulfurization mechanism

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References(25)

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