Journal
ADSORPTION-JOURNAL OF THE INTERNATIONAL ADSORPTION SOCIETY
Volume 22, Issue 2, Pages 139-150Publisher
SPRINGER
DOI: 10.1007/s10450-015-9731-3
Keywords
Desulfurization; Ion-exchanged; Competitive adsorption; Thiophenes; Benzothiophenes; Zeolite
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Funding
- National Natural Science Foundation of China [81172204]
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In this paper, Ce(IV)-Y, Cu(II)-Y and Cu(II)-Ce(IV)-Y adsorbents were prepared by the liquid-phase ion-exchange Y zeolites with combined Cu and Ce ions at low temperature and room pressure. The adsorbents were characterized by means of X-ray diffraction, N-2-adsorption specific surface area measurements (BET), X-ray photoelectron spectroscopy, Pyridine adsorption infrared spectroscopy and Fourier transform infrared. The adsorptive desulfurization properties of these three adsorbents were studied in a fixed-bed unit through a model gasoline which made up of 1-octane solution of the refractory sulfur compounds (Such as thiophene and benzothiophene) and a certain amount of toluene or cyclohexene. The results indicate that Cu(II)-Ce(IV)-Y bind the organic sulfur compounds through two types of adsorption modes: pcomplexation and direct sulfur-adsorbent interaction. The adsorption selectivity of sulfur compounds onto Cu(II)-Ce(IV)-Y decreased in the order: benzothiophene > 2,5-dimethylthiophene > 3-methylthiophene > thiophene. The effect of competition components on the metal ion-exchanged Y zeolites for sulfur removal in the order: cyclohexene > toluene. The Cu(II)-Ce(IV)-Y possesses the high sulfur adsorption capacity similar to Cu(II)-Y and high selectivity for sulfur compounds similar to Ce(IV)-Y, which can be attributed to the synergistic interaction between Cu2+ and Ce4+.
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