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《Chinese Journal of Catalysis》 2003-04
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Dispersion and Adsorption of Dibenzothiophene on the Surface of CoMo/γ-Al_2O_3 Catalyst

XU Yongqiang, ZHAO Ruiyu, SHANG Hongyan, ZHAO Huiji, LIU Chenguang *(Key Laboratory of Catalysis, CNPC, College of Chemistry & Chemical Engineering, University of Petroleum (East China), Dongying 257061, Shandong, China)  
Dibenzothiophene (DBT) and alkyl substituted dibenzothiophenes are the main sulfur compounds which cannot be removed easily from diesel fuel. In this paper, the dispersion and dispersion threshold of DBT on the surface of the CoMo/ γ Al 2O 3 catalyst were studied, and its possible adsorption state was analyzed.DBT powder is mixed with CoMo/ γ Al 2O 3 catalyst powder, which contains 16%MoO 3 and 2 8%CoO, and the m (DBT) / m (CoMo/ γ Al 2O 3) is 0 05, 0 10, 0 15, 0 20, 0 25, 0 30 and 0 40, respectively. It is found that DBT can disperse spontaneously onto the surface of CoMo/ γ Al 2O 3 at temperatures ( e.g. 80 ℃) lower than its melting point. The XRD peaks of the residual crystalline DBT appear for the samples with m (DBT) / m (CoMo/ γ Al 2O 3) 0 15, but they disappear for the samples with m (DBT) / m (CoMo/ γ Al 2O 3) ≤0 15. It can be inferred that the adsorption of DBT on the surface of CoMo/ γ Al 2O 3 may have the end on manner through the adsorption of sulfur atoms on active sites. The FT IR result of the sample m (DBT) / m (CoMo/ γ Al 2O 3) =0 10 shows that the in plane stretching vibration (~ 3?000 cm -1 ) and out of plane deforming vibration (~744 cm -1 ) of C H, and the vibration of aromatic ring ( 1?400 ~ 1?600 cm -1 ) of adsorbed DBT do not shift significantly. These results suggest that DBT may be adsorbed on the surface of CoMo/ γ Al 2O 3 vertically rather than horizontally. The LRS result of the m (DBT) / m (CoMo/ γ Al 2O 3) =0 10 sample also shows that the Raman diffraction band of the aromatic ring (~ 1?570 cm -1 ) of adsorbed DBT does not shift significantly. The adsorption of DBT on the surface of CoMo/ γ Al 2O 3 may include two states, one is the end on manner through the adsorption of sulfur atoms, the other is the flat manner through the adsorption of π electrons of DBT molecules, and the main states may be the former.
【Fund】: 中国石油天然气集团公司催化重点实验室资助课题 (CNPC KLC 2 0 0 1 0 5 )
【CateGory Index】: O643.3
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