Nitrogen fertilizer is essential for food production and made from ammonia (NH3). NH3 is mainly produced by the Haber–Bosch process using nitrogen and fossil hydrocarbons. However, other obtaining method of NH3 is required in order to reduce use of fossil fuels. On the other hand, releasing NH3 into the environment causes environmental issues (e.g. PM2.5). In order to reduce use of fossil fuels and NH3 emission, recovery and reuse of NH3 from exhaust gas is key technology. At the view of nitrogen resource, NH3 recovery as ammonium salts has the advantage of density, comparing with that as ammonia gas. When high concentration of NH3 and CO2 gases are mixed under humid conditions, solid state ammonium bicarbonate (NH4HCO3) is synthesized. We aimed to demonstrate a novel method to obtain powder of NH4HCO3 from fetid air in pig farm. The treatment of NH3 for agricultural industry is necessary, because NH3 emissions are mainly from the agricultural sector. However, NH3 recovery at agricultural sector is a tough target because of humid condition. Selective adsorption is efficient for molecule recovery from trace concentration in humid gas. Copper Prussian blue analogues (CuPBA) has ammonia selectivity and adsorption capacity even in trace concentration. We succeeded to obtain solid NH4HO3 from trace NH3 and CO2 by adsorption and sublimation using ammonia adsorbent of CuPBA. Interestingly, CuPBA adsorbs some amount of H2O and CO2 with adsorbing NH3, which are raw materials of NH4HCO3. With heating CuPBA adsorbing NH3, the adsorbed molecules were desorbed into gas, resulting that solid NH4HCO3 was obtained with cooling the gas. We will talk about demonstration of the harvesting of NH4HCO3 from malodorous air in pig farm.

Harvesting ammonium salt from malodorous air in pig farm using prussian blue analogues

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