Alkali earth metal halides were studied for the use as ammonia storage material operated below 60 kPa. Reversible and irreversible absorption were observed for each samples. MgCl2, CaCl2, and CaBr2 were found to be adequate for TSA method (between 298 and 473 K), and these storage capacities were much higher than that of Na-Y zeolite. CaCl2-CaBr2 mixed halides proved to be a useful material with large absorption for PSA cycling between 10 and 60 kPa of ammonia.