Deep desulfurization by selective adsorption on a heteroatoms zeolite prepared by secondary synthesis |
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Authors: | Ke Tang Li-juan SongLin-hai Duan Xiu-qi LiJian-zhou Gui Zhao-lin Sun |
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Affiliation: | College of Petrochemical Engineering, Liaoning University of Petroleum & Chemical Technology, Fushun 113001, Liaoning Province, PR China |
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Abstract: | Gallium atoms have been introduced into the framework of Y zeolite by treating the zeolite with an aqueous solution of ammonium hexafluoro gallate. Desulfurization of various model fuels containing about 500 μg/g sulfur were studied over the synthesized Y zeolite (Ga]AlY) with a liquid hourly space velocity of 7.2 h− 1 at ambient conditions. The sulfur adsorption capacity was 7.0, 14.5, and 17.4 mg(S)/g adsorbent for thiophene, 4,6-dimethyldibenzothiophene (4,6-DMDBT), and tetrahydrothiophene (THT), respectively. The charges on S atom in thiophene, 4,6-DMDBT and THT, calculated by using density functional theory (DFT), are − 0.159, − 0.214 and − 0.298, respectively, implying that the S–M bond between the adsorption sites and thiophene is much weaker than that between the adsorption sites and THT or 4,6-DMDBT. |
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Keywords: | Isomorphous substitution Heteroatom zeolite DFT Model fuels Adsorption desulfurization |
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