CIESC Journal ›› 2020, Vol. 71 ›› Issue (10): 4601-4610.doi: 10.11949/0438-1157.20200359

• Thermodynamics • Previous Articles     Next Articles

Porous BN for selective adsorption of sulfur-containing compounds from fuel oil: DFT study

Qiaoling LI(),Xiaoyu WU,Xuewei WANG,Zhi XIE,Xiaofei YU,Xiaojing YANG,Yang HUANG,Lanlan LI()   

  1. School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China
  • Received:2020-04-07 Revised:2020-05-16 Online:2020-10-05 Published:2020-06-02
  • Contact: Lanlan LI E-mail:2397211504@qq.com;liabc@hebut.edu.cn

Abstract:

Selective removal of sulfides in fuel oil is of great significance to the environment and human health. In this work, using density functional theory (DFT) with and without long-range dispersion correction via Grimme??s scheme (D-DFT), the adsorption behavior and adsorption selectivity of dibenzothiophene (DBT), n-hexadecane, and n-octane and toluene on the porous boron nitrides (p-BN) with/without vacancy defect have been studied. On perfect p-BN, the adsorption energy (Eads) was calculated to be 1.395, 0.600 and 0.457 eV (PBE+D) for single DBT, n-hexadecane and n-octane molecules respectively, indicating that the adsorption of DBT on p-BN is highly preferred over n-hexadecane. The strong adsorption of DBT on p-BN was attributed to the intermolecular force that derived from the interaction between the B—N polar bond and the permanent dipole of DBT molecule. With the introduction of nitrogen (VN) and boron (VB) vacancy defects, the Eads of DBT increased to 1.650 and 1.875 eV (PBE+D) and the Eads of the n-hexadecane is only 0.400 and 0.600 eV (PBE+D), respectively. The electronic structure [calculations density of states (DOS), the highest occupied molecular orbital (HOMO), total charge density together with charge density difference, and Hirshfeld charges] reveal that the chemical interactions between the defect level and S atom in sulfide enhanced the adsorption of DBT molecule on p-BN. For practical application, other sulfur-containing organic compounds including 4,6-dimethyldibenzothiophene (4,6-DMDBT), thiophene (T), benzothiophene (BT) and carbide toluene in fuel oil are also considered and p-BN still tends to selectively adsorb sulfides from carbides preferentially, suggesting that p-BN with/without vacancy defect is promising for the removal of sulfur-containing organic compounds from fuel oil. Finally, the defect formation energies were estimated to evaluate the energetic stability of defective p-BN. The growth of VN or VB strongly depends on the chemical environment. Under boron-rich conditions, the use of B2H4 as the B source is more conducive to the formation of VN than the use of B, α-B12, and BH3, etc. Contrastingly, the use of N2H4 as the N source in the nitrogen-rich environment is more beneficial to the formation of VB than the use of N2, NH3. Our results provide a useful guidance for the design and fabrication of porous BN sorbent for sulfur-containing organic matter removing from fuel oil.

Key words: computational chemistry, adsorption, simulation, porous BN, fuel oil, desulfurization

CLC Number: 

  • O 641

Fig.1

The establishment process of the p-BN supercell"

Fig.2

The geometric configurations of adsorbed DBT, n-hexadecane and n-octane on perfect p-BN, p-BN with VN defect and p-BN with VB defect, respectively"

Fig.3

Calculated adsorption energies (Eads) for DBT, n-hexadecane and n-octane on the perfect p-BN, VN and VB, respectively"

Fig.4

The total density of states (TDOS) for p-BN, VN and VB"

Fig.5

Total density of states (TDOS) and projected density of states (PDOS) for DBT"

Fig.6

The highest occupied molecular orbital for DBT adsorbed on VN and VB defects"

Fig.7

Total charge density and charge-density difference plots of DBT adsorbed on VN and VB defects, respectively"

Table 1

Hirshfeld atomic charge of DBT adsorption on VN and VB defect configuration"

Atom lableCharge/e
VNVB
B1/N10.1190.24
B2/N20.0890.163
B3/N30.1160.249
S0.2050.404
Call-0.432-0.399
Hall0.3960.396

Fig.8

Optimized geometric configurations of adsorbed toluene, 4,6-DMDBT, T and BT on VB"

Fig.9

Calculated adsorption energies (Eads) for toluene, 4,6-DMDBT, T and BT on the VB, respectively"

Table 2

The defect formation energies (Eform/eV) of the VB and the VN under various chemical conditions"

ItemN-rich conditionB-rich condition
N2H4N2NH3B2H6α-B12BH3B2H4
VNPBE6.446.315.545.264.663.713.36
VBPBE6.206.337.117.397.998.949.28
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