Promotional effect of TiO2 on quinoline hydrodenitrogenation activity over Pt/γ-Al2O3 catalysts

被引:25
作者
Liu, Juan [1 ]
Li, Wen-ying [1 ,2 ]
Feng, Jie [2 ]
Gao, Xiang [1 ]
Luo, Zhong-yang [1 ]
机构
[1] Zhejiang Univ, State Key Lab Clean Energy Utilizat, Hangzhou 310027, Zhejiang, Peoples R China
[2] Taiyuan Univ Technol, Training Base State Key Lab Coal Sci & Technol Jo, Taiyuan 030024, Shanxi, Peoples R China
关键词
Hydrodenitrogenation; Quinoline; Pt/gamma-Al2O3; catalysts; Titania; Dibenzothiophene; Hydrodesulfurization; SUPPORT BRONSTED ACIDITY; SULFIDE CATALYSTS; MESOPOROUS SILICA; PARTICLE-SIZE; HYDRODESULFURIZATION; HYDROGENATION; HDN; PERFORMANCE; ALUMINA; SELECTIVITY;
D O I
10.1016/j.ces.2019.07.040
中图分类号
TQ [化学工业];
学科分类号
0817 ;
摘要
The structural and electronic properties of Pt/gamma-Al2O3 catalysts catalysts for quinoline hydrodenitrogenation were modified by introducing TiO2. The results indicated that the addition of TiO2 enhanced the reducibility of PtOx species, which increased the number of metallic Pt active sites. TiO2 facilitated quinoline hydrodenitrogenation over Pt/gamma-Al2O3 catalysts catalysts, with an increase in activity from 80.6% to 91.5% at 340 degrees C and 3 MPa when the TiO2 content was 16.3 wt%; and improved resistance to the inhibiting effects of sulfur species, therefore the hydrodenitrogenation activity decreased less sharply. High activity in dibenzothiophene hydrodesulfurization, i.e., above 91%, was maintained with different sulfur concentrations. Density functional theory calculations confirmed that dibenzothiophene and quinoline had comparable adsorption energies on a metallic Pt surface. We propose that the partially reduced TiO2 mitigated inhibition by dibenzothiophene and enhanced the hydrogenation of quinoline via the formation of electron-rich Pt species. (C) 2019 Elsevier Ltd. All rights reserved.
引用
收藏
页码:1085 / 1095
页数:11
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