期刊
FUEL
卷 174, 期 -, 页码 118-125出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2016.01.093
关键词
Catalytic adsorptive desulfurization (CADS); Dibenzothiophene (DBT); TiO2/SBA-15; Adsorption isotherm; Kinetics; Ultra-clean fuel
资金
- National Natural Science Foundation of China [21576093]
- Guangdong Natural Science Foundation [2015A020215006, 2014A030312007]
- Petro China Innovation Foundation
- Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry
- Fundamental Research Funds for the Central Universities
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 N-2 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 degrees C, respectively. Furthermore, desulfurization tests in 5 consecutive CADS-regeneration 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. (c) 2016 Elsevier Ltd. All rights reserved.
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