کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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63136 | 47673 | 2007 | 6 صفحه PDF | دانلود رایگان |
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′β′ phase (∼Zr7O11N2) to the nitrogen-rich β″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″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.
Journal: Journal of Catalysis - Volume 250, Issue 1, 15 August 2007, Pages 19–24