Dechlorination of Reformate via Chemical Adsorption Reactions by Ce–Y Zeolite
2014
Gesk, Georg | Shi, Li | Wang, Xin
In this research, dechlorination of reformate by the catalytic reforming process was investigated over ion-exchanged Y zeolites. Effects of cations, calcination, and reaction temperature on the removal of chloride compounds have been evaluated by performing dynamic tests. The adsorbents were characterized by X-ray diffraction, X-ray fluorescence analysis, thermogravimetric analysis, NH₃ temperature-programmed desorption, pyridine Fourier transform infrared (pyridine-FTIR) spectroscopy, and X-ray spectroscopy (XPS). Pyridine-FTIR showed that the type and amount of acidic sites present in zeolites have a significant influence on the dechlorination performance of the zeolites: Brønsted acid contributes to increasing the dechlorination capacity, while excessive Lewis acid has an adverse effect on the dechlorination performance. XPS confirmed that the chemical state of the cation in zeolites affects the dechlorination performance of modified zeolites and cerium in the form of Ce³⁺ is more favorble for dechlorination.
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