부산대학교 도서관

Ammonia, which decomposes to N2 and H2, is considered an excellent hydrogen storage material becauseof its high capacity. However, undecomposed ammonia can cause corrosion and catalyst poisoning,thereby necessitating its removal from the effluent stream. One of the methods used to separate H2,N2, and residual NH3 gases after ammonia decomposition is pressure swing adsorption (PSA). In thisstudy, activated carbon (AC) loaded with MgCl2 was used as an adsorbent for PSA. High-pressure adsorptionand breakthrough experiments showed that the optimum Mg loading amount is 4 wt% Mg and theoptimum operating temperature is 40 C. Under these conditions, a balance between the adsorption anddesorption performance (in terms of adsorption capacity and desorption time, respectively) wasachieved. The optimal MgCl2-loaded AC had an average adsorption capacity of 6.48 mmol NH3/g, whichwas higher than that of AC by 93%. This adsorbent maintained its high adsorption capacity throughout 15cycles of adsorption–desorption and performed well in breakthrough experiments simulating either theremoval or enrichment of ammonia. Thus, MgCl2-loaded AC is a promising adsorbent that can be potentiallyapplied for both ammonia removal and enrichment in industrial PSA processes for hydrogenextraction.