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实验研究了反应气流中SO_2对低浓度甲烷在Cu/γ-Al_2O_3颗粒上催化燃烧特性的影响规律,考察了硫在催化剂上的累积作用,探讨了催化剂硫中毒的原因。研究表明:SO_2存在时,燃烧反应时Cu/γ-Al_2O_3催化剂发生硫中毒,且中毒效应随着SO_2浓度的增加而加深;经预硫化处理的催化剂的活性有所下降,且低温段硫中毒效应更为明显,较高的反应温度能够使生成的硫酸盐发生分解,减少对催化剂活性的影响;造成Cu/γ-Al_2O_3催化剂硫中毒的原因是催化剂内有硫酸盐的生成,减少了活性位点及比表面积,阻碍了活性位点对甲烷分子的吸附,从而降低了催化剂活性。
The effect of SO 2 on the catalytic combustion characteristics of low concentration methane on Cu / γ-Al 2 O 3 particles was investigated experimentally, and the cumulative effect of sulfur on the catalyst was investigated. The reason of sulfur poisoning was also discussed. The results showed that sulfur poisoning occurred on the Cu / γ-Al 2 O 3 catalyst during combustion reaction in the presence of SO 2, and the poisoning effect deepened with the increase of SO 2 concentration. The activity of the pre-sulfurized catalyst decreased, and the sulfur poisoning effect More obviously, the higher reaction temperature can decompose the generated sulfate and reduce the influence on the catalyst activity. The reason of sulfur poisoning caused by Cu / γ-Al_2O_3 catalyst is the formation of sulfate in the catalyst and the reduction of the active site And specific surface area, hindered the active site adsorption of methane molecules, thereby reducing the catalyst activity.