The influence of pre-treatment gas mixture upon the ammonia synthesis activity of Co-Re catalysts
The influence of pre-treatment gas mixture upon the ammonia synthesis activity of Co-Re catalysts
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DOI：
10.1016/j.catcom.2015.04.016
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发表时间：
2015-08-05
影响因子：
3.7
通讯作者：
Zhou, W. Z.
中科院分区：
文献类型：
--
作者：
McAulay, K.;Hargreaves, J. S. J.;Zhou, W. Z.
在环境压力和400℃下对氨合成具有高活性的CoRe4催化剂可以在无氨解阶段的情况下制备。在3∶1的H₂∶N₂和3∶1的H₂∶Ar气氛下进行预处理被证明会影响催化性能，后一种处理在切换到氨合成原料流时，在活性产生之前会有一个诱导期。两种预处理气氛之间行为的差异在程序升温氮同位素交换实验中有所体现，其中经H₂∶Ar处理的材料没有活性，而经H₂∶N₂处理的相应材料则有活性。(C) 2015作者。由爱思唯尔出版集团出版。
CoRe4 catalysts highly active for ammonia synthesis at ambient pressure and 400 degrees C can be prepared without an ammonolysis stage. Pre-treatments under 3:1 H-2:N-2 and 3:1 H-2:Ar atmospheres are shown to influence catalytic performance with the latter treatment leading to an induction period prior to development of activity upon switching to an ammonia synthesis feedstream. The difference in behaviour between the two pre-treatment atmospheres is manifested in temperature programmed nitrogen isotopic exchange experiments where H-2:Ar treated material is inactive and its H-2:N-2 treated counterpart is active. (C) 2015 The Authors. Published by Elsevier B.V.