Nitrogen transfer properties in tantalum nitride based materials
Nitrogen transfer properties in tantalum nitride based materials
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DOI：
10.1016/j.cattod.2016.06.035
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发表时间：
2017-05
期刊：
影响因子：
5.3
通讯作者：
S. Laassiri;C. Zeinalipour-Yazdi;C. Catlow;J. Hargreaves
中科院分区：
文献类型：
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作者：
S. Laassiri;C. Zeinalipour-Yazdi;C. Catlow;J. Hargreaves
采用不同的合成技术成功地制备了具有不同微结构特征（例如表面积）的Ta 3-xMxNy（M = Re，Fe，Co; x = 0，0.25，0.5，1）材料。使用氨合成与H2/Ar进料流（涉及晶格氮转移的反应）的氮转移性能上的氮化钽的微观结构和其化学组成的依赖性进行了评估。结果表明，氮化钽的氮反应性更主要的晶格氮的稳定性，而不是微观结构性能。在未掺杂的氮化钽的情况下，仅观察到具有增强的表面积的反应性的有限改善，这证明了微结构对反应性的有限影响。然而，过渡金属掺杂剂的性质以及其含量被观察到在氮化钽的氮转移性质中起关键作用，并且强烈地影响其反应性。事实上，掺杂低水平的Co的氮化钽导致在较低温度下的增强的反应性。
Ta3-xMxNy(M = Re, Fe, Co; x = 0, 0.25, 0.5, 1) materials with different microstructural features (e.g.surface area) were successfully prepared using different synthesis techniques. The dependence of nitrogen transfer properties upon tantalum nitride microstructure and its chemical composition was evaluated using the ammonia synthesis with a H2/Ar feedstream (a reaction involving lattice nitrogen transfer). It was shown that nitrogen reactivity for tantalum nitride is more dominated by lattice nitrogen stability rather than microstructural properties. In the case of non-doped tantalum nitride, only a limited improvement of reactivity with enhanced surface area was observed which demonstrates the limited impact of microstructure upon reactivity. However, the nature of the transition metal dopant as well as its content was observed to play a key role in the nitrogen transfer properties of tantalum nitride and to impact strongly upon its reactivity. In fact, doping tantalum nitride with low levels of Co resulted in enhanced reactivity at lower temperature.