Modeling and experimental studies of ammonia absorption in a spray tower

Regulated Threshold Pressure of Reversibly Sigmoidal NH3 Absorption Isotherm with Ionic Liquids

“…Although critical to the economy, NH 3 as an alkaline gas pollutant is one of the main components in the formation of fine particle matter in the atmosphere; it not only has a negative impact on the environment but also does great harm to human health. , Therefore, it is imperative to efficiently recycle ammonia waste from the industry at low concentrations of thousands of ppm. It is reported that efficient NH 3 ab-/adsorption is mainly carried out by acid–base interaction, − coordination, and hydrogen bond combination. However, high energy, above 120 kJ, should be provided for per mol NH 3 desorption from Brønsted acidic agents and metal complexes with an unoccupied d orbital. , Recently, a variety of materials including EDS, − porous polymers, − and ionic liquids (ILs) were applied to capture NH 3 by hydrogen bonding, and these reports demonstrate that it is a great option in energy-saving NH 3 desorption, but overwhelmingly focuses on absorption at high concentration.…”

Study of NH3 Removal Based on Chemical-Looping Combustion

“…2−7 For a waste gas containing a high concentration of NH 3 , the absorption method is commonly adopted. 8 However, limited by its absorption efficiency, NH 3 is difficult to thoroughly absorb, resulting in low-concentration NH 3 emissions. The selective catalytic oxidation (SCO) of NH 3 to N 2 and H 2 O (i.e., NH 3 -SCO) is one of the most promising approaches for waste gas containing low-concentration NH 3 .…”

“…Ammonia (NH 3 ) is a noxious gas and is viewed as one of the important precursors of PM 2.5 ; therefore, NH 3 emissions have serious harm . According to the amount and concentration of NH 3 emissions, technologies for the removal of NH 3 include biological methods, absorption, adsorption, catalytic decomposition, selective catalytic oxidation, and others. − For a waste gas containing a high concentration of NH 3 , the absorption method is commonly adopted . However, limited by its absorption efficiency, NH 3 is difficult to thoroughly absorb, resulting in low-concentration NH 3 emissions.…”