Experimental investigation on H(2) adsorption performance of composite adsorbent in vacuum tank

Hydrogen is one of the main residual gases in vacuum tank. H(2) adsorption performance of the composite adsorbent in the tank was researched by using a test bench and an X-ray diffraction. The composite adsorbent is composed of 5A molecular sieve and getter. Leakage and outgassing rate is decreased by 64% after placing getter. H(2) adsorption capacity of the composite adsorbent that includes w(Ag2O)=15%, w(PdO)=85% and 5A molecular sieve is the highest at the same pressure. The optimum percentage content of Ag(2)O in the getter is 22%. The crystal phase structure of PdO and Ag(2)O in getter is unchanged before and after H(2) adsorption. H(2) adsorption behaviors can be divided into two steps: reacting quickly at the initial stage, and then, it turns to reacting slowly at a relative long period.