Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.jcat.2021.05.002
Title: Insight into the Roles of Ammonia during Direct Alcohol Amination over Supported Ru Catalysts
Authors: FU XINPU 
Han Peijie
Wang Yunzhu 
Wang Shuai
Yan Ning 
Keywords: Amination
Role fo ammonia
Ru catalysts
Reaction mechanims
Issue Date: 11-May-2021
Publisher: Elsevier
Citation: FU XINPU, Han Peijie, Wang Yunzhu, Wang Shuai, Yan Ning (2021-05-11). Insight into the Roles of Ammonia during Direct Alcohol Amination over Supported Ru Catalysts. Journal of Catalysis. ScholarBank@NUS Repository. https://doi.org/10.1016/j.jcat.2021.05.002
Abstract: The direct amination of alcohols with ammonia is a promising route to make primary amines, but a full understanding of various parameters, especially the effect of co-adsorbed nitrogen-containing species on the catalyst surface during amination, has still been lacking. Here, we report that the presence of dissociated ammonia species on Ru nanoparticles substantially enhances its activity in catalyzing the dehydrogenation step that is kinetically-relevant to amination. Kinetic, spectroscopic, and theoretical methods are combined to highlight how ammonia affects this rate-determining step: in the dissociated form the surface NHx species interact with the alcohol reactant and lower the corresponding barrier of Osingle bondH scission, thus promoting the activity on Ru. In contrast to Pd-based catalysts, the N atom in the generated R-NH2 product binds moderately strongly with Ru sites, thus inhibiting the formation of undesired secondary amine via further Csingle bondN coupling. This work unveils the overlooked role of ammonia in the amination reaction over Ru-based catalysts.
Source Title: Journal of Catalysis
URI: https://scholarbank.nus.edu.sg/handle/10635/197309
DOI: 10.1016/j.jcat.2021.05.002
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