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On the possibility of an Eley-Rideal mechanism for ammonia synthesis on Mn6N5+x (x=1)-(111) surfaces

On the possibility of an Eley-Rideal mechanism for ammonia synthesis on Mn6N5+x (x=1)-(111) surfaces

Zeinalipour-Yazdi, Constantinos D. ORCID: 0000-0002-8388-1549 (2018) On the possibility of an Eley-Rideal mechanism for ammonia synthesis on Mn6N5+x (x=1)-(111) surfaces. Physical Chemistry Chemical Physics, 20 (27). pp. 18729-18736. ISSN 1463-9076 (Print), 1463-9084 (Online) (doi:https://doi.org/10.1039/C8CP02381F)

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Abstract

Recently we reported an Eley–Rideal/Mars–van Krevelen mechanism for ammonia synthesis on cobalt molybdenum nitride (Co3Mo3N). In this mechanism hydrogenation of activated dinitrogen occurs directly from the gas phase in a low barrier step forming a hydrazinylidene intermediate [double bond, length as m-dash]NNH2. In this paper we study whether such a mechanism of ammonia synthesis could occur on the (111) surface of another metal nitride, Mn6N5+x (x = 1), as this would explain the low-T ammonia synthesis activity of Co3Mo3N. We find that although N2 adsorbs more strongly than H2 on the (111) surface, having also examined the (110) and the (100) surface, N2 is not significantly activated when adsorbed in an end-on configuration. The hydrogenation reactions via an Eley–Rideal mechanism are all high barrier processes (>182 kJ mol−1) and therefore an Eley–Rideal mechanism for ammonia synthesis is predicted to not occur on this material unless there are high temperatures. Our study indicates that the fact that an Eley–Rideal/Mars–van Krevelen mechanism occurs on Co3Mo3N is a result of the stronger activation of dinitrogen at nitrogen vacancies when dinitrogen is adsorbed in an end-on configuration.

Item Type: Article
Additional Information: Open Access. This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.
Uncontrolled Keywords: Eley-Rideal, Ammonia Synthesis, Mn6N5+x, Manganese nitride
Subjects: Q Science > QC Physics
Q Science > QD Chemistry
Faculty / Department / Research Group: Faculty of Engineering & Science
Faculty of Engineering & Science > Department of Pharmaceutical, Chemical & Environmental Sciences
Last Modified: 03 Oct 2018 16:27
Selected for GREAT 2016: None
Selected for GREAT 2017: None
Selected for GREAT 2018: None
Selected for GREAT 2019: None
URI: http://gala.gre.ac.uk/id/eprint/21491

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