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Received November 6, 2008
Accepted February 10, 2009
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The effect of metal ions in MNaY-zeolites for the adsorptive removal of tetrahydrothiophene

Division of Energy Systems Research and Division of Chemical Engineering and Materials Engineering, Ajou University, Wonchun-dong Yeongtong-gu, Suwon 443-749, Korea 1Division of Applied Chemical Engineering, Pukyong National University, San 100 Yongdang-dong, Nam-gu, Busan 608-739, Korea 2Energy and Environment Laboratory, Samsung Advanced Institute of Technology (SAIT), P.O. Box 111, Suwon 440-600, Korea
edpark@ajou.ac.kr
Korean Journal of Chemical Engineering, September 2009, 26(5), 1291-1295(5), 10.1007/s11814-009-0203-x
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Abstract

The adsorptive removal of tetrahydrothiophene (THT) was carried out over transition metal ion-exchanged Na-Y zeolites. CuNa-Y, CoNa-Y, NiNa-Y and FeNa-Y were prepared by a conventional ion exchange method from Na-Y using the nitrate solutions of corresponding metals. N2 physisorption, inductively coupled plasma-atomic emission spectroscopy (ICP-AES) and X-ray diffraction were conducted to characterize adsorbents. The temperature programmed_x000D_ desorption (TPD) of THT was also perfomed to probe the interaction between the adsorbent and the THT. The crystal structure of Y-zeolite was completely destroyed in FeNa-Y, which resulted in a insignificant amount of adsorbed THT. The breakthrough capacity, which is defined as the amount of sulfur adsorbed on the adsorbent before detecting sulfur species by PFPD, decreased in the following order CuNa-Y>CoNa-Y>NiNa-Y>>FeNa-Y. For interaction between THT and adsorbent, a TPD peak appeared over CoNa-Y at the highest temperature, which implies that_x000D_ the strongest interaction can be made between THT and Co^(2+) in CoNa-Y.

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