Journal article
Alloyed Ni-Fe nanoparticles as catalysts for NH3 decomposition
Department of Energy Conversion and Storage, Technical University of Denmark1
Imaging and Structural Analysis, Department of Energy Conversion and Storage, Technical University of Denmark2
Amminex Emmisions Technology A/S3
Department of Physics, Technical University of Denmark4
Surface Physics and Catalysis, Department of Physics, Technical University of Denmark5
A rational design approach was used to develop an alloyed Ni-Fe/Al2O3 catalyst for decomposition of ammonia. The dependence of the catalytic activity is tested as a function of the Ni-to-Fe ratio, the type of Ni-Fe alloy phase, the metal loading and the type of oxide support. In the tests with high temperatures and a low NH3-to-H2 ratio, the catalytic activity of the best Ni-Fe/Al2O3 catalyst was found to be comparable or even better to that of a more expensive Ru-based catalyst.
Small Ni-Fe nanoparticle sizes are crucial for an optimal overall NH3 conversion because of a structural effect favoring the smallest particles in terms of catalytic activity per active site. Compared with SiO2, ZrO2 and TiO2, the support materials Al2O3 or Mg-Al-spinel give the highest performance in the high temperature range.
Language: | English |
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Year: | 2012 |
Pages: | 22-31 |
ISSN: | 18733875 and 0926860x |
Types: | Journal article |
DOI: | 10.1016/j.apcata.2012.08.045 |
ORCIDs: | Simonsen, Søren Bredmose and Chorkendorff, Ib |