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Alloyed Ni-Fe nanoparticles as catalysts for NH3 decomposition

Paper ID Volume ID Publish Year Pages File Format Full-Text
40615 45860 2012 10 PDF Available
Title
Alloyed Ni-Fe nanoparticles as catalysts for NH3 decomposition
Abstract

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.

Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (290 K)Download as PowerPoint slideHighlights► Non-noble metal Ni-Fe alloy catalysts for NH3 decomposition. ► Promising catalysts for high temperature NH3 decomposition. ► Structural sensitivity: increasing activity for decreasing particle sizes. ► Of various support oxides: Al2O3-based support materials give the best performance.

Keywords
Catalysis; NH3 decomposition; Nickel-iron alloy; Hydrogen storage; Hydrogen production; Fuel cell
First Page Preview
Alloyed Ni-Fe nanoparticles as catalysts for NH3 decomposition
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volumes 447–448, 7 December 2012, Pages 22–31
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis