The role of preparation route upon the ambient pressure ammonia synthesis activity of Ni2Mo3N
The role of preparation route upon the ambient pressure ammonia synthesis activity of Ni2Mo3N
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DOI：
10.1016/j.apcata.2014.10.030
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发表时间：
2015-09
影响因子：
5.5
通讯作者：
N. Bion;F. Can;J. Cook;J. Hargreaves;A. Hector;W. Levason;Andrew R. McFarlane;Mélissandre Richard;K. Sardar
中科院分区：
文献类型：
--
作者：
N. Bion;F. Can;J. Cook;J. Hargreaves;A. Hector;W. Levason;Andrew R. McFarlane;Mélissandre Richard;K. Sardar
制备方法对Ni_2Mo_3N样品的常压氨合成催化性能有重要影响。由NiMoO 4前体制备的材料必然含有相当大比例的Ni杂质相。由该前体制备的材料对于氨合成是相对不活跃的，而具有更高的相纯度和催化活性的Ni 2 Mo 3 N可以由采用改进的Pechini方法使用柠檬酸盐凝胶的前体制备。Ni 2 Mo 3 N可以通过N2/H2预处理制备，这代表了使用氨解的路线的显著优势。散装晶格氮似乎是相对不活泼的Ni 2 Mo 3 N，虽然异裂氮同位素交换研究表明，一个显着的程度是可交换的预处理条件。基于改进的Pechini方法的路线也被证明适用于制备相对高相纯度的CoNiMo 3 N，从而允许获得用于催化筛选的季氮化物的制备。
The preparation route has been shown to have a significant influence upon the catalytic behaviour of Ni2Mo3N samples for ambient pressure ammonia synthesis. Materials prepared from a NiMoO4precursor necessarily contain a significant fraction of Ni impurity phase. Materials prepared from this precursor are relatively inactive for ammonia synthesis, whereas Ni2Mo3N of much greater phase purity and catalytic activity can be prepared from precursors employing a modified Pechini method with the use of citrate gels. Ni2Mo3N can be prepared by N2/H2pre-treatment which represents a significant advantage over routes employing ammonolysis. Bulk lattice nitrogen appears to be relatively unreactive in Ni2Mo3N, although heterolytic nitrogen isotopic exchange studies indicate that a significant degree is exchangeable subject to pre-treatment conditions. The modified Pechini method based route has also been shown to be applicable to the preparation of CoNiMo3N of relatively high phase purity, thereby allowing access to the preparation of quaternary nitrides for catalytic screening.