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Issue 43, 2014
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Kinetics of the NH3 and CO2 solid-state reaction at low temperature

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Abstract

Ammonia and carbon dioxide play an important role in both atmospheric and interstellar ice chemistries. This work presents a theoretical and experimental study of the kinetics of the low-temperature NH3 and CO2 solid-state reaction in ice films, the product of which is ammonium carbamate (NH4+NH2COO). It is a first-order reaction with respect to CO2, with a temperature-dependent rate constant fitted to the Arrhenius law in the temperature range 70 K to 90 K, with an activation energy of 5.1 ± 1.6 kJ mol−1 and a pre-exponential factor of 0.09−0.08+1.1 s−1. This work helps to determine the rate of removal of CO2 and NH3, via their conversion into ammonium carbamate, from atmospheric and interstellar ices. We also measure first-order desorption energies of 69.0 ± 0.2 kJ mol−1 and 76.1 ± 0.1 kJ mol−1, assuming a pre-exponential factor of 1013 s−1, for ammonium carbamate and carbamic acid, respectively.

Graphical abstract: Kinetics of the NH3 and CO2 solid-state reaction at low temperature

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Publication details

The article was received on 02 Jun 2014, accepted on 22 Aug 2014 and first published on 22 Aug 2014


Article type: Paper
DOI: 10.1039/C4CP02414A
Author version available: Download Author version (PDF)
Citation: Phys. Chem. Chem. Phys., 2014,16, 23604-23615
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    Kinetics of the NH3 and CO2 solid-state reaction at low temperature

    J. A. Noble, P. Theule, F. Duvernay, G. Danger, T. Chiavassa, P. Ghesquiere, T. Mineva and D. Talbi, Phys. Chem. Chem. Phys., 2014, 16, 23604
    DOI: 10.1039/C4CP02414A

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