NDLI: Catalytic decomposition of ammonia over silicon-carbide nanotube: a DFT study

Content Provider	Springer Nature Link
Author	Esrafili, Mehdi D. Nurazar, Roghaye
Copyright Year	2014
Abstract	Decomposition of ammonia is important for a series of technological and environmental applications. For developing highly active catalysts for this reaction, detailed understanding of underlying mechanisms remains a challenge. In this work, density functional theory calculations are performed to investigate the adsorption and catalytic decomposition of NH$_{3}$ molecule on a pristine silicon-carbide nanotube (SiCNT) surface. The adsorption energy of a possible stable configuration and the activation energies for elementary reactions involved are obtained in the present study. It is found that ammonia experiences a chemisorption interaction with the SiCNT surface, with a significant alter in its structure with respect to the gas-phase molecule. Subsequently, the coadsorption of two ammonia molecules on the SiCNT surface is studied and the catalytic dehydrogenation reactions are considered. The catalytic activity of SiCNT surface in the decomposition reaction of NH$_{3}$ molecules is slightly altered due to locally adsorbed NH$_{3}$. The reaction energies and the activation barriers obtained suggest that for the decomposition of ammonia molecules into N$_{2}$H$_{2}$, the rate-determining step is the NH$_{2}$ → NH + H reaction. As a result, the NH$_{2}$ is the dominant surface species after the SiCNT surface is exposed to NH$_{3}$.
Starting Page	799
Ending Page	807
Page Count	9
File Format	PDF
ISSN	10400400
Journal	Structural Chemistry
Volume Number	26
Issue Number	3
e-ISSN	15729001
Language	English
Publisher	Springer US
Publisher Date	2014-12-13
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	SiCNT Decomposition Ammonia Dehydrogenation reaction DFT Computer Applications in Chemistry Physical Chemistry Theoretical and Computational Chemistry
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry Condensed Matter Physics

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