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A computational study of the heterogeneous synthesis of hydrazine on Co3Mo3N

Zeinalipour-Yazdi, Constantinos D. and Catlow, Charles Richard 2017. A computational study of the heterogeneous synthesis of hydrazine on Co3Mo3N. Catalysis Letters 147 (7) , pp. 1820-1826. 10.1007/s10562-017-2080-y

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Abstract

Periodic and molecular density functional theory calculations have been applied to elucidate the associative mechanism for hydrazine and ammonia synthesis in the gas phase and hydrazine formation on Co3Mo3N. We find that there are two activation barriers for the associative gas phase mechanism with barriers of 730 and 658 kJ/mol, corresponding to a hydrogenation step from N2 to NNH2 and H2NNH2 to H3NNH3, respectively. The second step of the mechanism is barrierless and an important intermediate, NNH2, can also readily form on Co3Mo3N surfaces via the Eley–Rideal chemisorption of H2 on a pre-adsorbed N2 at nitrogen vacancies. Based on this intermediate a new heterogeneous mechanism for hydrazine synthesis is studied. The highest relative barrier for this heterogeneous catalysed process is 213 kJ/mol for Co3Mo3N containing nitrogen vacancies, clearly pointing towards a low-energy process for the synthesis of hydrazine via a heterogeneous catalysis route.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Advanced Research Computing @ Cardiff (ARCCA)
Cardiff Catalysis Institute (CCI)
Publisher: Springer Verlag (Germany)
ISSN: 1011-372X
Funders: EPSRC
Date of First Compliant Deposit: 20 June 2017
Date of Acceptance: 8 May 2017
Last Modified: 13 Aug 2019 12:35
URI: http://orca-mwe.cf.ac.uk/id/eprint/101582

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