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A DFT Study of the Extractive Desulfurization Mechanism by [BMIM][AlCl] Ionic Liquid +
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Hongping Li, Yonghui Chang, Wenshuai Zhu, Wei Jiang, Ming Zhang, Jiexiang Xia, Sheng Yin, and Huaming Li J. Phys. Chem. B, Just Accepted Manuscript • DOI: 10.1021/acs.jpcb.5b00516 • Publication Date (Web): 24 Apr 2015 Downloaded from http://pubs.acs.org on May 3, 2015
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The Journal of Physical Chemistry
Graphical abstract
Desulfurization mechanism of aromatic sulfur compounds is attributed to a π-π interaction as well as hydrogen bonding interaction during EDS by [BMIM]+[AlCl4]- ionic liquid. Reduced density gradient and electrostatic potential analysis implies the dominant π-π interaction and hydrogen bonding interaction are driven by electrostatic interaction between IL and aromatic sulfur compounds.
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A DFT Study of the Extractive Desulfurization Mechanism by [BMIM]+[AlCl4]- Ionic Liquid Hongping Li,a Yonghui Chang,* b Wenshuai Zhu, a Wei Jiang,c Ming Zhang, c Jiexiang Xia,a Sheng Yin,a and Huaming Li* a,c a
School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang
212013, P. R. China b
College of Chemistry and Chemical Engineering, Hainan Normal University,
Haikou, Hainan 571158, P. R. China c
Institute for Energy Research, Jiangsu University, Zhenjiang 212013, P. R. China
*Corresponding author: Tel.:+86-511-88791800; Fax: +86-511-88791708; E-mail address:
[email protected] (H. M. Li),
[email protected] (Y. H. Chang)
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The Journal of Physical Chemistry
ABSTRACT In this work, the interaction nature between [BMIM]+[AlCl4]- ionic liquid (IL) and aromatic sulfur compounds (thiophene, benzothiophene, and dibenzothiophene) has been studied by means of density functional theory (M06-2X functional) combined with an implicit solvation model. Although [BMIM]+[AlCl4]- is a metal-containing IL, its extractive desulfurization mechanism is different from other metal-containing ILs but similar with non-metal containing ILs. Important reactions involved in extractive desulfurization (EDS) were systematically studied. Our results have demonstrated that both cation and anion play important roles in EDS. Based on the structure analysis, reduced density gradient analaysis (RDG), and energy decomposition analysis, [BMIM]+ cation affords a π-π interaction while [AlCl4]- anion provides a hydrogen bonding interaction. Electrostatic potential analysis implies the dominant π-π interaction and hydrogen bonding interaction are driven by electrostatic interaction between IL and aromatic sulfur compounds. Interaction energy between [BMIM]+[AlCl4]- and thiophene (TH), benzothiophene (BT), dibenzothiophene (DBT) follows the order: TH
