硫浓度波动对低浓度甲烷Cu/γ-Al_2O_3催化燃烧的影响

Effects of Sulfur Concentration Fluctuations on Catalytic Combustion of Low Concentration Methane With SO_2 Over Cu/γ-Al_2O_3

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 effects of the amplitude and frequency of SO_2 concentration fluctuations on the combustion characteristic of low concentration methane over CU/7-Al_2O_3 catalysts were experimentally studied at 580℃,and the sulfur cumulative situation on the catalysts were investigated.The results showed that SO_2 in the feed gases led to a decrease of activity of the catalysts,thus,affecting me than ecatalytic combustion characteristics.The SO_2 with fluctuant concentration had a greater impact on the combustion characteristics of methane than the SO_2 with stable concentration,and the impact became more obvious when amplitude and frequency of SO_2 concentration fluctuations increased.The sulfur content in the catalyst would be cumulative.As time goes on,the increase of activation energy and the decrease of the catalysts activity would not stop until a time point.After this point,sulfur poisoning phenomenon would not significantly increased with the time prolonging.