Ammonia adsorbent

A method for adsorption of ammonia molecules, comprising:

• contacting a gas containing ammonia molecules (NH3) with a metal cyanocomplex represented by a general formula:
• AxM[M′(CN)6]y.zH2O,
• where M stands for copper, or copper and one or more metal atoms selected from the group consisting of vanadium, chromium, manganese, iron, ruthenium, cobalt, rhodium, nickel, palladium, platinum, silver, zinc, lanthanum, europium, gadolinium, lutetium, barium, strontium, and calcium,
• M′ stands for iron, or iron and one or more metal atoms selected from the group consisting of vanadium, chromium, molybdenum, tungsten, manganese, ruthenium, cobalt, nickel, platinum, and copper,
• A stands for potassium cations, or potassium cations and one or more cations selected from the group consisting of hydrogen, lithium, sodium, rubidium, and cesium,
• x stands for a numerical value from 0 to 3,
• y stands for a numerical value from 0.1 to 1.5, and
• z stands for a numerical value from 1 to 6,
• thereby allowing for adsorption of the ammonia molecules in said gas,
• wherein said metal cyanocomplex is recovered by allowing for desorption of the ammonia molecules from said metal cyanocomplex, thereby recovering said metal cyanocomplex.