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Adsorptive desulfurization of propylene derived from bio-ethanol

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We studied adsorption characteristics of a series of LTA zeolite as an adsorbent for desulfurization of propylene, that was produced from bioethanol by ethanol-to-olefin (ETO) conversion. A breakthrough curve (BTC) for adsorption of methanethiol, as one of the sulfur impurities of propylene produced from bioethanol, in the presence of propylene was measured using a fixed-bed column packed with the LTA zeolite. The BTC revealed that the effect of the competitive adsorption of propylene on the LTA zeolite strongly depended on a cation species exchanged in the micropores of the zeolite. Among the cation species examined in this study, bivalent cation of zinc (Zn2+) was proved to be the most effective one to increase the amount of methanethiol adsorbed on the LTA zeolite under the presence of propylene. The specific interaction of methanethiol with the LTA zeolite exchanged with Zn2+ was confirmed by the measurement of a temperature-programmed desorption (TPD) spectrum of methanethiol.

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Correspondence to T. Yamamoto.

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Yamamoto, T., Chaichanawong, J., Thongprachan, N. et al. Adsorptive desulfurization of propylene derived from bio-ethanol. Adsorption 17, 17–20 (2011).

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