真空储罐中复合吸附剂吸氢性能的试验研究

Experimental Investigation on H_2 Adsorption Performance of Composite Adsorbent in Vacuum Tank

针对氢气引起真空储罐夹层真空度下降的问题,通过搭建的吸氢试验台和X射线二维衍射仪研究复合吸附剂在真空储罐中的吸氢特性,该复合吸附剂由5A分子筛和含有不同wPdO和wAg2O的吸气剂组成.结果表明,放入吸气剂后,储罐的漏放气速率降低了64%.含wAg2O=15%和wPdO=85%的复合吸附剂的吸氢量最大.在吸气剂中,Ag2O的最佳质量分数为22%,PdO和Ag2O的晶相结构在吸氢反应前后没有变化.吸氢过程被分为初始的快反应和后期的慢反应2个阶段.

Hydrogen is one of the main residual gases in vacuum tank. H2 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. H2 adsorption capacity of the composite adsorbent that includes wAg2O=15%, wPdO=85% and 5A molecular sieve is the highest at the same pressure. The optimum percentage content of Ag2O in the getter is 22%. The crystal phase structure of PdO and Ag2O in getter is unchanged before and after H2 adsorption. H2 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.