Journal
CATALYSIS TODAY
Volume 121, Issue 3-4, Pages 204-209Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cattod.2006.05.089
Keywords
temporal analysis of products; CN coupling; reaction mechanism; ammonia dehydrogenation; methane decomposition
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The mechanism of the HCN formation from ammonia and methane over Pt black was investigated using a temporal analysis of products (TAPs) reactor system. At 1173 K the hydrogen cyanide production rate depends on the order of introducing the reactants. HCN is formed rapidly on the methane pulse just after introducing ammonia. However, a slow formation of HCN is observed on the ammonia pulse that follows a methane pulse. Moreover the form of the HCN response resembles closely that of the nitrogen and hydrogen also released during the ammonia pulse. Thus, the rate-determining step for the formation of HCN is the decomposition rate of ammonia. A reaction sequence based on elementary steps is proposed for the HCN synthesis. The formation of HCN after pulsing H, points to a pool of surface intermediate species that are hydrogenated to HCN. (c) 2006 Elsevier B.V. All rights reserved.
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