Journal
CATALYSIS TODAY
Volume 160, Issue 1, Pages 79-86Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cattod.2010.02.066
Keywords
Ammonia decomposition; Pure hydrogen; Encapsulation; Iron; Core-shell structure
Funding
- RGC, HKSAR [RGC 200107]
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The stable core-shell Fe@SiO2 catalysts reported in this paper are highly efficient for the generation of COx-free H-2 through ammonia decomposition. By tuning the porosity of SiO2 shells (using C18TMS agent) and with the introduction of an appropriate amount of Cs dopant (via pre-deposition as well as post-impregnation), the diffusion efficiency of the catalysts and the surface property of Fe cores can be modified for better performance. The Fe@SiO2 structures function as microcapsular-like reactors during ammonia decomposition. Naked nanoparticles of metallic iron tend to aggregate into bulk particles spontaneously. The role of the stable SiO2 shells is to prevent the enwrapped core particles from aggregation at high reaction temperatures. (C) 2010 Elsevier B.V. All rights reserved.
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