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在300~450℃范围内,研究氢中加入CO2对Pd8Y0.23Ru合金膜氢渗透性能的影响。结果表明,CO2的加入会大大降低膜的氢渗透率,CO2浓度越高,氢渗透率降低越多;CO2对Pd8Y0.23Ru合金膜存在一定的毒化作用,使氢渗透率下降,450℃下的毒化作用明显强于300℃,但随着时间的延长,渗透率降低速率趋缓。CO2降低氢渗透率还有另外2个因素:当CO2浓度较高(>3%,摩尔分数)时,聚集在膜表面附近的CO2对氢气传质的阻塞作用是氢渗透率降低的主要因素;当CO2浓度较低(<1%)时,CO2在膜表面吸附,占据氢的活性点位,是氢渗透率降低的主要因素。
In the range of 300-450 ℃, the effect of adding CO2 to hydrogen on the hydrogen permeation performance of Pd8Y0.23Ru alloy was studied. The results show that the addition of CO2 can greatly reduce the hydrogen permeability of the membrane. The higher the CO2 concentration, the lower the hydrogen permeability. The CO2 poisoned the Pd8Y0.23Ru alloy membrane and the hydrogen permeability decreased. Poisoning was significantly stronger than 300 ℃, but with the extension of time, the rate of decrease of permeability slowed down. There are two other factors that reduce the hydrogen permeability of CO2: when CO2 concentration is higher (> 3%, mole fraction), the blocking effect of CO2 accumulating near the surface of the membrane on hydrogen mass transfer is the main factor for the decrease of hydrogen permeability; When the CO2 concentration is lower (<1%), CO2 adsorbs on the membrane surface and occupies the active site of hydrogen, which is the main factor for the decrease of hydrogen permeability.