Understanding Co-Mo Catalyzed Ammonia Decomposition: Influence of Calcination Atmosphere and Identification of Active Phase
Understanding Co-Mo Catalyzed Ammonia Decomposition: Influence of Calcination Atmosphere and Identification of Active Phase
复制标题
了解 Co-Mo 催化氨分解：煅烧气氛的影响和活性相的识别
DOI：
10.1002/cctc.201501275
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发表时间：
2016-03-07
期刊：
影响因子：
4.5
通讯作者：
Zhou, Xinggui
中科院分区：
文献类型：
--
作者：
Duan, Xuezhi;Ji, Jian;Zhou, Xinggui
阐明催化剂的结构和化学性质的影响以及区分活性相是多相催化的基本问题，但它们往往因载体的性质而变得复杂，增加了一个新的维度。本工作以金属胺金属酸盐（Co（en）（3）MoO 4）为前驱体，通过煅烧和预氮化处理，研究了Co-Mo催化氨分解反应中的这两个问题。煅烧气氛（即，结果表明，空气气氛对催化剂的结构和化学性质有显著影响，空气气氛有利于催化剂的稳定反应，尽管催化剂氮化不完全。Co（en）（3）MoO_4在空气中焙烧后，经预氮化处理后，催化剂的活性提高，Co_3Mo_3N为Co-Mo催化剂的主要活性相。这里揭示的见解为氨分解Co-Mo催化剂的设计提供了新的思路。
To elucidate the effect of textural and chemical properties of catalysts and to discriminate the active phase are fundamental issues in heterogeneous catalysis, but they are often complicated by the nature of support adding a new dimension. In this work, metal amine metallate (Co(en)(3)MoO4) precursor was directly treated by calcination and prenitridation to understand these two issues in Co-Mo catalyzed ammonia decomposition. The calcination atmosphere (i.e., Ar and Air) is found to remarkably affect the textural and chemical properties of catalysts, and air atmosphere is favorable for higher stable reactivity despite incomplete nitridation of the catalyst. Further prenitridation of the sample from the calcination of Co(en)(3)MoO4 under air gives rise to higher catalytic activity, and Co3Mo3N is suggested as the dominant active phase of Co-Mo catalysts. The insights revealed here shed new light on the design of Co-Mo catalysts for ammonia decomposition.