Effects of Si/Al Ratio on Adsorptive Removal of Thiophene and Benzothiophene over Ion-Exchanged AgCeY Zeolites
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- 作者：Hua Song ; Huijie Gao ; Hualin Song ; Gang Yang ; Xiaojuan Li
- 刊名：Industrial & Engineering Chemistry Research
- 出版年：2016
- 出版时间：April 6, 2016
- 年：2016
- 卷：55
- 期：13
- 页码：3813-3822
- 全文大小：577K
- ISSN：1520-5045
文摘
AgCeY-n zeolites with different Si/Al ratios n (n = 3.0, 4.8, and 5.3) were successfully prepared and characterized by XRD, BET analysis, SEM, IR spectroscopy, XPS, FTIR spectroscopy, and ICP analysis. The effects of the Si/Al ratio on the adsorptive desulfurization properties of the adsorbents were evaluated. The results showed that AgCeY-5.3 exhibited the best sulfur removal capacity and selectivity. The capacity for sulfur removal onto AgCeY-n decreased in the order AgCeY-5.3 > AgCeY-4.8 > AgCeY-3.0 for a model oil comprising thiophene (TP) and benzothiophene (BT), along with certain amounts of toluene or cyclohexene. The adsorption affinity of the sulfur compounds was in the order BT > TP. In addition, the inhibition effects on the AgCeY-n zeolites for sulfur removal were in the order cyclohexene > toluene. The removal of organic sulfur compounds onto AgCeY-n was mainly by π-electronic and direct coordination (S–M) interaction.