Understanding the Electrochemically Induced Conversion of Urea to Ammonia Using Nickel Based Catalysts

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Abstract

In this paper, the mechanism of the electrochemically induced hydrolysis of urea to ammonia (eU2A) at 70 °C in alkaline medium using nickel electrodes was investigated. The intermediates and products in the bulk solution were monitored by Fourier Transform Infrared spectroscopy (FTIR). The intermediates and products of the reaction on the catalyst surface were analyzed by in-situ Raman spectroscopy. Urea electrolysis and thermal hydrolysis of urea to ammonia (in the bulk solution) take place in parallel to the eU2A process. The ammonia production rate depends strongly on the amount of nickel oxyhydroxide as well as the concentration of OH ions. The redox couple of Ni2+ and Ni3+ ions plays an important role in the mechanism of the reaction.

Original languageEnglish
Pages (from-to)564-571
Number of pages8
JournalElectrochimica Acta
Volume246
DOIs
StatePublished - Aug 20 2017

Keywords

  • ammonia generation
  • nickel hydroxide
  • nickel oxyhydroxide
  • selective catalytic reduction
  • urea to ammonia hydrolysis

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