Organic bases catalyze the synthesis of urea from ammonium salts derived from recovered environmental ammonia

Yuichi Manaka, Yuki Nagatsuka, Ken Motokura
2020 Scientific Reports  
Ammonia from sewage and livestock manure is a major environmental pollutant. To consume environmental ammonia, we investigated the organic base-catalyzed synthesis of urea. 1,8-Diazabicyclo[5.4.0]undec-7-ene (DBU) catalyzes the conversion of ammonium carbamate to urea in 35% yield at 100 °C. Moreover, DBU also converts other ammonium salts into urea. A mechanism that involves nucleophilic attack of ammonia following ion exchange is proposed.
doi:10.1038/s41598-020-59795-6 pmid:32071338 fatcat:lwfuqlmdhzehzpkk435ziyhlja