Neutron diffraction and gravimetric study of the iron nitriding reaction under ammonia decomposition conditions,Physical Chemistry Chemical Physics

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Neutron diffraction and gravimetric study of the iron nitriding reaction under ammonia decomposition conditions
Physical Chemistry Chemical Physics ( IF 2.9 ) Pub Date : 2017-10-04 00:00:00 , DOI: 10.1039/c7cp04494a
Thomas J. Wood _{1,

2,

3,

4,

5} , Joshua W. Makepeace _{1,

2,

3,

4,

5} , William I. F. David _{1,

2,

3,

4,

5}

Affiliation

Ammonia decomposition over iron catalysts is known to be affected by whether the iron exists in elemental form or as a nitride. In situ neutron diffraction studies with simultaneous gravimetric analysis were performed on the nitriding and denitriding reactions of iron under ammonia decomposition conditions. The gravimetric analysis agrees well with the Rietveld analysis of the neutron diffraction data, both of which confirm that the form of the iron catalyst is strongly dependent on ammonia decomposition conditions. Use of ammonia with natural isotopic abundance as the nitriding agent means that the incoherent neutron scattering of any hydrogen within the gases present is able to be correlated to how much ammonia had decomposed. This novel analysis reveals that the nitriding of the iron occurred at exactly the same temperature as ammonia decomposition started. The iron nitriding and denitriding reactions are shown to be related to steps that take place during ammonia decomposition and the optimum conditions for ammonia decomposition over iron catalysts are discussed.

中文翻译：

氨分解条件下铁氮化反应的中子衍射和重量分析

众所周知，铁催化剂上的氨分解会受到铁元素形式还是氮化物形式的影响。原位在氨分解条件下，对铁的氮化和反硝化反应进行了同时重分析的中子衍射研究。重量分析与中子衍射数据的Rietveld分析非常吻合，这两者都证实铁催化剂的形式在很大程度上取决于氨的分解条件。使用具有天然同位素丰度的氨作为氮化剂意味着存在的气体中任何氢的非相干中子散射都可以与氨分解的量相关。这项新颖的分析表明，铁的氮化发生在与氨分解开始的温度完全相同的温度下。

更新日期：2017-10-09

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