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Influence of Pd-Ce interaction and chlorine ion on hydrodesulfurization reaction: The activity and sulfur tolerance of the Pd-Ceo2/Al2O3 catalyst

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Abstract

CeO2 promoted palladium catalysts supported on Al2O3 were prepared using the impregnation (IM) and the deposition-precipitation (DP) methods. The activities and sulfur tolerance of the catalysts for hydrodesulfurization (HDS) were detected with thiophene HDS as probe reaction. H2 adsorption, XRD, FTIR, NH3-TPD, XPS were used to characterize the catalysts. The Pd-CeO2/Al2O3 (IM) catalyst was highly active for the HDS reaction, and it had much stronger sulfur tolerance than the Pd/Al2O3 catalyst. Pd-CeO2/Al2O3 (DP) showed excellent sulfur tolerance while its initial activity decreased. It was observed that with the chlorine bridge, the interfacial structure of Pd-Cl−1-Ce3+ was responsible for the high activity of the Pd-CeO2/Al2O3 (IM) catalyst, at the same time the interaction of Pd with Ce was weakened by Cl−1 ions. The enhanced sulfur tolerance over the Pd-CeO2/Al2O3 (IM) catalyst was attributed to the weakened Pd-S bond caused by the competitive adsorption of H2S on Ce3+ ions. As to the Pd-CeO2/Al2O3 (DP) catalyst, a strong interaction of Pd with Ce put Pd at an electron-deficient state, the creation of sulfided palladium was therefore inhibited.

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Authors and Affiliations

  1. Institute of Applied Chemistry, Nanchang University, NanChang, 330031, China

    Xun Lu, Laitao Luo & Xinsun Chen

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  1. Xun Lu
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  2. Laitao Luo
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  3. Xinsun Chen
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Correspondence to Laitao Luo.

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Lu, X., Luo, L. & Chen, X. Influence of Pd-Ce interaction and chlorine ion on hydrodesulfurization reaction: The activity and sulfur tolerance of the Pd-Ceo2/Al2O3 catalyst. React Kinet Catal Lett 94, 35–46 (2008). https://doi.org/10.1007/s11144-008-5238-1

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  • DOI: https://doi.org/10.1007/s11144-008-5238-1

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