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Citation: LU Xun, LUO Lai-Tao, CHENG Xin-Sun. Sulfur Tolerance of CeO₂ Promoted Pd/Al₂O₃ Catalyst on Hydrodesulfurization Reaction[J]. Chinese Journal of Applied Chemistry, ;2008, 25(10): 1181-1185. shu

Sulfur Tolerance of CeO₂ Promoted Pd/Al₂O₃ Catalyst on Hydrodesulfurization Reaction

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

Corresponding author: LUO Lai-Tao,
Received Date: 8 September 2007
Available Online: 8 January 2008
Fund Project: 江西教育厅科研项目(GJJ08021) (GJJ08021)高等学校博士学科点专项研究基金(20040403001)资助项目 (20040403001)

CeO₂ promoted Pd/Al₂O₃ catalyst was prepared by impregnation method.Its activity and sulfur tolerance was investigated in the hydrodesulfurization of thiophene.CO adsorption,FT-IR and TG were used to characterize the catalyst.The results of deactivity with time and sulfide degree showed that Pd-CeO₂/Al₂O₃ catalyst had much better sulfur tolerance than Pd/Al₂O₃ catalyst.The FT-IR results indicated the addition of CeO₂ caused the bond energy of Pd-S to weaken and H₂S to be adsorbed on CeO₂.TG revealed that H₂S was mainly adsorbed on CeO₂ and not on Pd.Enhanced sulfur tolerance of Pd-CeO₂/Al₂O₃ was attributed to the Pd electron deficient state which inhibitd the formation of sulfided palladium.In addition,competitive adsorption of H₂S on CeO₂ resulted in the lowering of partial pressure of H₂S around the Pd phase in close contact with CeO₂.
- palladium,
- ceria,
- hydrodesulfurization,
- sulfur tolerance
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Sulfur Tolerance of CeO₂ Promoted Pd/Al₂O₃ Catalyst on Hydrodesulfurization Reaction