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在580℃下分别考察了SO_2浓度波动幅度.波动频率对低浓度甲烷Cu/γ-Al_2O_3催化燃烧特性的影响,并探究了硫在Cu/γ-Al_2O_3催化剂上的累积情况。结果表明,气流中SO_2的引入会使催化剂的活性下降而影响甲烷催化燃烧特性,且具有波动浓度的SO_2比稳定浓度的SO_2对甲烷催化燃烧的影响更大,随浓度波动幅度的增大和波动频率的升高该影响更为明显;Cu/γ-Al_2O_3催化剂内硫的含量会发生累积,随着时间的增长,低浓度甲烷催化燃烧反应的活化能逐渐上升,催化剂活性逐渐下降,到达一定程度后,两者不再大幅变化,硫中毒现象不会再随时间延长而明显加深。
The effect of fluctuation frequency on the catalytic combustion of low concentration methane Cu / γ-Al 2 O 3 was investigated at 580 ℃, and the accumulation of sulfur on Cu / γ-Al 2 O 3 catalyst was also investigated. The results show that the introduction of SO 2 in the gas stream will decrease the activity of the catalyst and affect the catalytic combustion of methane. The SO 2 with the fluctuating concentration has a greater effect on the catalytic combustion of methane than the stable concentration of SO 2. With the increase of the concentration fluctuation and the fluctuation frequency Of Cu / γ-Al_2O_3 catalyst, the content of sulfur will accumulate. With the increase of time, the activation energy of low concentration methane catalytic combustion reaction gradually increases and the activity of catalyst decreases gradually. When reaching a certain level , The two will no longer change drastically, and sulfur poisoning will not significantly deepen with time.