Current research on gaseous ammonia detecting and capture technologies

Ammonia is currently widely used for fertilizers, and it continues to grow as a potential green fuel source or hydrogen carrier which may result in growing ammonia emissions. Increasing anthropogenic ammonia emissions raises concerns such as disrupting the global nitrogen cycle and negating greenhouse gas reduction. This review article outlines and compiles recent studies on gaseous ammonia detecting and absorption/adsorption, which could alert or reduce rogue emissions, i.e., unintended releases of ammonia. Different sensors and their characteristics are outlined with a focus on the more popular chemoresistive technologies. Several absorption/adsorption methods for ammonia capture using metal-organic frameworks (MOFs) and deep eutectic solvents (DESs) are described and certain research highlighted.