In-situ H2 production via low temperature decomposition of ammonia

insights into the role of cesium as a promoter

Alfred Hill, Laura Torrente Murciano

Research output: Contribution to journalArticle

34 Citations (Scopus)
76 Downloads (Pure)

Abstract

Cesium-promoted ruthenium nanoparticles supported on multi-walled carbon nanotubes catalysts are shown to be highly active for hydrogen production by ammonia decomposition. Its low temperature activity is significantly improved as the cesium loading increases, reducing the activation energy from 96.7 kJ/mol in the absence of cesium to 59.3 kJ/mol with a cesium/ruthenium molar ratio of 3. Hydrogen production was observed to proceed below 590 K which represents a breakthrough towards the use of ammonia as chemical storage for in-situ hydrogen production on fuel cells. The catalytic enhancement is shown to be due to the electronic modification of ruthenium by the electron donating cesium promoter located on the ruthenium surface and in close proximity on the CNT surface. However, higher promoter loadings above a cesium/ruthenium ratio of 3 leads to ammonia inaccessibility to the catalytic active sites.
Original languageEnglish
Pages (from-to)7646-7654
Number of pages9
JournalInternational Journal of Hydrogen Energy
Volume39
Issue number15
Early online date13 Apr 2014
DOIs
Publication statusPublished - 15 May 2014

Fingerprint

Cesium
cesium
ammonia
Ammonia
Ruthenium
ruthenium
Decomposition
decomposition
hydrogen production
Hydrogen production
Temperature
carbon nanotubes
fuel cells
proximity
Fuel cells
Carbon nanotubes
Thermodynamic properties
Activation energy
activation energy
Nanoparticles

Keywords

  • Ammonia decomposition
  • In-situ H2 production
  • Ruthenium
  • Cesium
  • Promoter

Cite this

In-situ H2 production via low temperature decomposition of ammonia : insights into the role of cesium as a promoter. / Hill, Alfred; Torrente Murciano, Laura.

In: International Journal of Hydrogen Energy, Vol. 39, No. 15, 15.05.2014, p. 7646-7654.

Research output: Contribution to journalArticle

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