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The impact of nitrogen mobility on the activity of zirconium oxynitride catalysts for ammonia decomposition

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Soerijanto,  Hary
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Wild,  Ute
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Schlögl,  Robert
Inorganic Chemistry, Fritz Haber Institute, Max Planck Society;

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Citation

Soerijanto, H., Rödel, E., Wild, U., Lerch, M., Schomäcker, R., Schlögl, R., et al. (2007). The impact of nitrogen mobility on the activity of zirconium oxynitride catalysts for ammonia decomposition. Journal of Catalysis, 250, 19-24. doi:10.1016/j.jcat.2007.04.024.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0011-0002-1
Abstract
A zirconium oxynitride catalyst was used for the decomposition of ammonia to hydrogen and nitrogen. The onset of catalytic activity at 550 °C coincided with the onset of nitrogen ion mobility in the material and a phase change from the initial β′ phase ( Zr7O11N2) to the nitrogen-rich β″ ZrON phase ( Zr7O9,5N3). No hydrazine formation during an extended time on stream was detectable. Moreover, the onset of activity was also correlated to a rapid change in the electronic structure of the surface accompanying formation of the more active β″ ZrON phase. The results presented here show for the first time a direct correlation among the onset of ion conductivity as a bulk property, a modified electronic structure of the surface, and the catalytic performance of a heterogeneous catalyst.