The Role of Composition for Cobalt Molybdenum Carbide in Ammonia Synthesis
The Role of Composition for Cobalt Molybdenum Carbide in Ammonia Synthesis
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DOI：
10.1021/acssuschemeng.7b02168
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发表时间：
2017-10-01
影响因子：
8.4
通讯作者：
Smith, Ronald I.
中科院分区：
文献类型：
--
作者：
AlShibane, Ihfaf;Daisley, Angela;Smith, Ronald I.
比较了Co_3Mo_3N、Co_3Mo_3C和Co_6Mo_6C的合成氨性能。与在400 ℃下具有活性的Co3Mo3N相反，在500 ℃的反应温度之前有诱导期，对于Co3Mo3C的稳态活性的建立是必要的。发现Co6Mo6C在测试条件下无活性。在诱导期间，发现发生了Co3Mo3C晶格的氮化，并且这在整个稳态反应期间持续，其中材料的组成向Co3Mo3N转变。两者合计，这些观察结果表明，在三元钴钼体系中的氨合成活性与16 C维科夫晶格位点中的N的存在相关。
The performance of Co3Mo3N, Co3Mo3C, and Co6Mo6C for ammonia synthesis has been compared. In contrast to Co3Mo3N, which is active at 400 degrees C, a reaction temperature of 500 degrees C, which was preceded by an induction period, was necessary for the establishment of steady state activity for Co3Mo3C. Co6Mo6C was found to be inactive under the conditions tested. During the induction period, nitridation of the Co3Mo3C lattice was found to occur, and this continued throughout the period of steady state reaction with the material transforming in composition toward Co3Mo3N. Taken together, these observations demonstrate that ammonia synthesis activity in ternary cobalt molybdenum systems is associated with the presence of N in the 16c Wyckoff lattice site.