The mixing effect of alkaline earth metal halides on ammonia absorption−desorption behavior was studied to develop a new ammonia storage material to be used for the pressure-swing absorption method. The halide mixtures with different cations (having a common anion) did not form the solid solution after drying of the mixed aqueous solution. The ammonia absorption isotherms on those samples were identical with those of the single-phase halide having the higher ammonia affinity among the two. The halide mixtures with a common cation (having different anions) formed a solid solution through the same mixing method. The isotherms on those samples showed an intermediate profile between the components. Among these kinds of combinations, CaCl2−CaBr2 (actually CaClBr) showed a pronounced ammonia storage capacity (16.4 mmol g-1) under the pressure-swing conditions of 60 and 10 kPa at 298 K, which was 12.6 times as high as that of the Na form of the Y-zeolite.
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Liu et al. (2004) studied this question.