Enhancement of Ammonia Synthesis on a Co3Mo3N-Ag Electrocatalyst in a K-beta Al2O3 Solid Electrolyte Cell

J. Diez-Ramirez, V. Kyriakou, I. Garagounis, A. Vourros, E. Vasileiou, P. Sanchez, F. Dorado, M. Stoukides*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

8 Citations (Scopus)

Abstract

The electrochemical promotion of ammonia synthesis by potassium ions (K+) on a Co3Mo3N-Ag electrocatalyst was studied in a K-beta ''-Al2O3 solid electrolyte cell. The effect of temperature (400-550 degrees C), P-H2/P-N2, feed composition (1.0, 3.0 and 6.0) and applied voltage was explored in detail. The catalyst was prepared by ammonolysis of the mixed oxide and was characterized by XRD and SEM. A volcano-type behavior was found, i.e., around 1% of potassium per total moles of Co3Mo3N improved the ammonia formation rate by as much as 48%. However, high percentages of potassium act as poison for the reaction, possibly due to the formation of K-N-H compounds that block the active sites. Faradaic efficiency (Lambda) values close to 300 are for the first time reported in NH3 synthesis.

Original languageEnglish
Pages (from-to)8844-8851
Number of pages8
JournalACS Sustainable Chemistry and Engineering
Volume5
Issue number10
DOIs
Publication statusPublished - Oct-2017
Externally publishedYes

Keywords

  • Ammonia synthesis
  • Nitride catalysts
  • Electrochemical promotion
  • K-beta ''-Al2O3
  • Cation electrochemical promotion of catalysis
  • BIMETALLIC NITRIDE CATALYSTS
  • SITU ELECTROCHEMICAL MODIFICATION
  • NH3 DECOMPOSITION
  • IONIC CONDUCTORS
  • PROMOTION
  • COMBUSTION
  • SYSTEM
  • NEMCA
  • NA

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