Palladium alloy of the current application, the silver accounting for about 20-30%, other ingredients (such as gold, etc.) The content of <5%. Rate and temperature of the hydrogen-permeable palladium alloy, the thickness of the membrane and the permeate touch both sides of the raw material hydrogen and the purity of the differential pressure (P). Elevated temperature, increasing the P and reduce the thickness of the film, causes the hydrogen permeation rate increases. However, elevated temperatures, will reduce the tensile strength of the permeable membrane. Therefore, the use of palladium tube temperature is usually controlled at about 450 ° C. Some impurities can lead to the palladium poisoning, so that the air permeability performance deterioration, and even allows the membrane destruction. The palladium can cause poisoning substances: mercury, arsenic halides, oil vapor, sulfur and ammonia-containing substances as well as dust and other. Palladium alloy can be made to the tubular (known the palladium tube) or the diaphragm (called palladium membrane).