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Citation: ZHANG Li, LIU Jian-jun, YANG Zhong-qing, ZHENG Shi-wei. Effects of sulfur poisoning on combustion characteristics of low concentration methane with SO2 over Cu/γ-Al2O3 catalysts[J]. Journal of Fuel Chemistry and Technology, ;2014, 42(5): 635-640. shu

Effects of sulfur poisoning on combustion characteristics of low concentration methane with SO2 over Cu/γ-Al2O3 catalysts

  • 1.

    1. Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education (Chongqing University), Chongqing 400030, China;

  • Received Date: 16 October 2013
    Available Online: 15 January 2014

    Fund Project: 国家自然科学基金(51206200) (51206200)中央高校基本科研业务经费(CDJZR12140031)。 (CDJZR12140031)

  • The Cu/γ-Al2O3 catalysts with 11.32% copper contents prepared by the incipient wetness impregnation were tested in a fixed bed reactor. The effects of SO2 concentration (0 ~ 0.02%) on the combustion characteristic and stability of low concentration methane (3%) over Cu/γ-Al2O3 catalysts were investigated. By the analysis of microstructure and chemical component of fresh and aged catalysts, the mechanism of sulfur poisoning in the catalytic reaction was discussed by combining with the theoretical analysis. The results show that the addition of SO2 in the feed gases leads to a decrease of activity and stability of the catalysts. The methane conversion decreases rapidly with the increasing concentration of SO2. The results of SEM, EDS, FT-IR and XRD reveal that the presence of SO2 in the feed gases can result in agglomeration and accumulation of sulfur on the surface of Cu/γ-Al2O3 catalysts. Sulfur is in the form of sulfate, which mainly contains copper sulfate (CuSO4). Under the condition of oxygen enrichment, the copper sulfate produced by the absorption of SO2 and oxygen ions on Cu2+ is attached to the surface of catalysts and forms a hard shell, which is the major reason for the sulfur poisoning.
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