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Energy Sources, Part A: Recovery, Utilization, and Environmental Effects Volume 34, 2012 - Issue 7
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Original Articles

The Adsorptive Removal of Thiophene from Benzene over ZSM-5 Zeolite

J. Liao State Key Laboratory of Coal Science and Technology, Shanxi Province and the Ministry of Science and Technology, Taiyuan University of Technology, Taiyuan, Shanxi, P. R. China
,
W. Bao State Key Laboratory of Coal Science and Technology, Shanxi Province and the Ministry of Science and Technology, Taiyuan University of Technology, Taiyuan, Shanxi, P. R. China
,
Y. Chen State Key Laboratory of Coal Science and Technology, Shanxi Province and the Ministry of Science and Technology, Taiyuan University of Technology, Taiyuan, Shanxi, P. R. China
,
Y. Zhang State Key Laboratory of Coal Science and Technology, Shanxi Province and the Ministry of Science and Technology, Taiyuan University of Technology, Taiyuan, Shanxi, P. R. China
&
L. Chang State Key Laboratory of Coal Science and Technology, Shanxi Province and the Ministry of Science and Technology, Taiyuan University of Technology, Taiyuan, Shanxi, P. R. China
Pages 618-625 | Received 17 Nov 2010, Accepted 17 Dec 2010, Published online: 24 Feb 2012
 
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Abstract

ZSM-5 zeolites with different Si/Al ratio (25, 38, 50) were selected for the research of adsorptive removing thiophene from benzene and the desulfurization behavior of H-ZSM-5(25) sorbent acid-modified and ion-exchanged was studied. The experimental results show that the sorbent H-ZSM-5(25) from acid-modified ZSM-5 zeolite with a Si/Al ratio of 25 is the best sorbent with the largest amount of Brönsted acidic sites, which plays an important role in the adsorption of thiophene. The results of the sorbents from H-ZSM-5(25) ion-exchanged with Ag+, Ni2+, Ce3+, and La3+ show that the desulfurization efficiency is increased for all ion-exchanged zeolites, because thiophene can be adsorbed via π-complexation over Ag-ZSM-5(25) and Ni-ZSM-5(25) zeolites, while through the S–M bond on Ce-ZSM-5(25) and La-ZSM-5(25) zeolites. Benzene can bring the effect of competitive adsorption with thiophene via π-complexation, so the efficiency of Ce-ZSM-5(25) and La-ZSM-5(25) removing thiophene from benzene by the selective S–M bond is better than that of Ag-ZSM-5(25) and Ni-ZSM-5(25), which can respectively reach to 92.7 and 93.9%.

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