Dissociation rates of urea in the presence of NiOOH catalyst: A DFT analysis

Damilola Daramola, Deepika Singh, Gerardine Botte

Research output: Contribution to journalArticle

Abstract

Single molecule reactions have been studied between nickel oxyhydroxide, urea, and the hydroxide ion to understand the process of urea dissociation into ammonia, isocyanic acid, cyanate ion, carbon dioxide, and nitrogen. In the absence of hydroxide ions, nickel oxyhydroxide will catalyze urea to form ammonia and isocyanic acid with the rate-limiting step being the formation of ammonia with a rate constant of 1.5 × 10-6 s-1. In the presence of hydroxide, the evolution of ammonia was also the rate-limiting step with a rate constant of 1.4 × 10-26 s-1. In addition, desorption of the cyanate ion presented an energy barrier of 6190 kJ mol-1 suggesting that the cyanate ion cannot be separated from NiOOH unless further reactions occurred. Finally, elementary dissociation reactions with hydroxide ions deprotonating urea to produce nitrogen and carbon dioxide were analyzed. These elementary reactions were investigated along three paths differing in the order that protons were removed and the n
Original languageEnglish
Pages (from-to)11513-11521
JournalDefault journal
DOIs
StatePublished - 2010

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