423803 Adsorption-Desorption Behavior and Mechanism of Dimethyl Disulfide in Hydrocarbon Liquid on Ion-Exchanged Y Zeolites

Tuesday, November 10, 2015: 8:45 AM
255F (Salt Palace Convention Center)
Dezhi Yi1, Li Shi2 and Xuan Meng2, (1)East China University of Science and Technology, Shanghai, LA, China, (2)East China University of Science and Technology, Shanghai, China

Removal of dimethyl disulfide (DMDS) from its solution has been investigated by using adsorption on the ion-exchanged Y zeolites. Effects of metal cations and preparation conditions on the removal efficiency have been accessed by performing the dynamic and static tests. The modified Y zeolites were prepared by the liquid ion-exchange method and the breakthrough adsorption capacity for DMDS was in “ Ni-Y > Co-Y > Na-Y > Ce-Y” order. The adsorbents were characterized by X-ray diffraction (XRD), thermal analysis (TGA) and X-ray photoelectron spectroscopy (XPS). Pyridine-FTIR spectroscopy showed that Lewis acidis contributed to increase the adsorption capacity, while Brønsted acid has an adverse effect on the desul-furization capability. Spectral shifts of the ν(C-S), ν(S-S) and ν(M-S) vibrations of the deactivation adsorbents were measured with the Raman spectrum. In situ Fourier transform infrared (FTIR) and temperature-programmed desorption of DMDS (DMDS-TPD) results indicated that the adsorption mechanisms on modified Y zeolite was the S-M (σ) bond which formed to increase adsorption bond energy of DMDS. The desorption activated energy, EA, of DMDS on the modified zeolite has been obtained and was in “ Ni-Y > Co-Y > Na-Y” order.

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See more of this Session: Fundamentals of Environmental Kinetics and Reaction Engineering
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