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

ZHANG Li; LIU Jian-jun; YANG Zhong-qing; ZHENG Shi-wei

Volume 42 Issue 05

May 2014

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Article Navigation > Journal of Fuel Chemistry and Technology > 2014 > 42(05): 635-640

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(05): 635-640.

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(05): 635-640.

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

1.
Key Laboratory of Low-grade Energy Utilization Technologies and Systems, Ministry of Education (Chongqing University), Chongqing 400030, China;
2.
College of Power Engineering, Chongqing University, Chongqing 400030, China

Received Date: 2013-10-16
Rev Recd Date: 2014-01-15
Publish Date: 2014-05-30

Abstract

Abstract

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.
- Cu/&gamma,
- -Al₂O₃ catalysts,
- low concentration methane,
- catalytic combustion,
- SO₂,
- sulfur poisoning

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References(16)

References

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