The purification of the product gas from dehydrogenation of liquid organic hydrogen carriers (LOHC) by using a PdAg-membrane is highly promising, since the low level of impurities in the released hydrogen stream allows low pressure operation and favours the coupling with the dehydrogenation step. Motivated by our recent short-term investigations indicating an influence of these impurities on the membrane performance the behaviour of the membrane by exposure to product gas was investigated in detail over a long period. In total, the membrane was operated for more than 200 days, including approx. 21 days under product gas from the LOHC-dehydrogenation. In the time period the performance has decreased by 88% and could be restored slowly but completely by using pure hydrogen. The degradation is caused by the coverage of active adsorption sites for the dissociation of hydrogen by hydrocarbons other than methane. The activation energy of permeation has almost tripled from 13 kJ mol⁻¹ to 38 kJ mol⁻¹ while desorption of impurities from the surface affect the process and its temperature dependence. SEM-analysis of the still 100%-selective membrane after more than 200 days of operation shows no significant changes in membrane morphology. Under the mild operating conditions, a lifetime of several years seems possible.

通过使用PdAg膜从液态有机氢载体（LOHC）脱氢提纯产物气非常有前途，因为释放的氢气流中杂质含量低，可以进行低压操作，并有利于与脱氢步骤耦合。根据我们最近的短期研究的动机，表明这些杂质对膜性能的影响，通过长期接触产物气体来研究膜的行为。膜总共运行了200天以上，包括大约30天。LOHC脱氢产生的产物气下21天。在这段时间内，性能下降了88％，使用纯氢可以缓慢但完全恢复。降解是由于活性吸附位点被甲烷以外的碳氢化合物解离而引起的，该活性吸附位点被覆盖。渗透的活化能从13 kJ mol几乎增加了两倍^-1至38 kJ mol ^-1，而杂质从表面脱附会影响该过程及其温度依赖性。超过200天的手术后，对仍具有100％选择性的膜的SEM分析显示，膜的形态无明显变化。在温和的操作条件下，几年的使用寿命似乎是可能的。