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Type: Journal article
Title: Catalytic adsorptive desulfurization of model diesel fuel using TiO₂/SBA-15 under mild conditions
Other Titles: Catalytic adsorptive desulfurization of model diesel fuel using TiO(2)/SBA-15 under mild conditions
Author: Ren, X.
Miao, G.
Xiao, Z.
Ye, F.
Li, Z.
Wang, H.
Xiao, J.
Citation: Fuel: the science and technology of fuel and energy, 2016; 174:118-125
Publisher: Elsevier
Issue Date: 2016
ISSN: 0016-2361
Statement of
Xiaoling Ren, Guang Miao, Zhiyong Xiao, Feiyan Ye, Zhong Li, Haihui Wang, Jing Xiao
Abstract: This study investigates catalytic adsorptive desulfurization (CADS) of model diesel fuel using TiO₂/SBA-15 under mild conditions. The TiO₂/SBA-15 was prepared by a facile incipient wetness impregnation method and characterized by N₂ adsorption and X-ray diffraction. The CADS referred to ADS performance were evaluated in a batch reactor. High desulfurization uptake of 12.7 mg/g was achieved at low sulfur concentration of 15 ppmw-S by TiO₂/SBA-15 under CADS, which was two-magnitude higher than that under ADS without the in-situ catalytic oxidation of dibenzothiophene. Kinetic results suggested that the CADS equilibrium over TiO₂/SBA-15 was reached fast in 0.5 h. In the CADS–TiO₂/SBA-15 system, the TiO₂ loading, cumene hydroperoxide/dibenzothiophene ratio and CADS temperature were optimized to be 10 wt%, 2, and 35 °C, respectively. Furthermore, desulfurization tests in 5 consecutive CADSregeneration cycles suggested that the bi-functional TiO₂/SBA-15 can be regenerated by acetonitrile washing followed with oxidative air treatment. The CADS–TiO₂/SBA-15 mechanism went through the oxidation of DBT to oxidized DBTO₂ over TiO₂/SBA-15 by cumene hydroperoxide, which was followed by the adsorption of the oxidized DBTO₂ over TiO₂/SBA-15. The superior desulfurization uptake at low sulfur concentration range, fast adsorption kinetics, excellent regenerability, operation at mild conditions, and facile and low-cost adsorbent synthesis make the CADS–TiO₂/SBA-15 system an effective and economic desulfurization approach for ultra-clean fuel production.
Keywords: Catalytic adsorptive desulfurization (CADS); dibenzothiophene (DBT); TiO₂/SBA-15; adsorption isotherm; kinetics; ultra-clean fuel
Rights: © 2016 Elsevier Ltd. All rights reserved.
DOI: 10.1016/j.fuel.2016.01.093
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Chemical Engineering publications

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