Deep desulfurization by selective adsorption on a heteroatoms zeolite prepared by secondary synthesis

作者：Tang Ke; Song Li juan; Duan Lin hai; Li Xiu qi; Gui Jian zhou; Sun Zhao lin^*

来源：Fuel Processing Technology, 2008, 89(1): 1-6.

DOI：10.1016/j.fuproc.2007.06.002

• isomorphous substitution
• heteroatom zeolite
• DFT
• model fuels
• adsorption desulfurization

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 mu g/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.

• 出版日期2008-1
• 单位辽宁石油化工大学