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Article Dans Une Revue ChemPhysChem Année : 2014

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

Résumé

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 mol1 and a pre-exponential factor of 0.090.08 +1.1 s1. 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 mol1 and 76.1  0.1 kJ mol1, assuming a pre-exponential factor of 1013 s1, for ammonium carbamate and carbamic acid, respectively.
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Dates et versions

hal-01082379 , version 1 (13-11-2014)

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J. A. Noble, P. Theule, F. Duvernay, G. Danger, T. Chiavassa, et al.. Kinetics of the NH3 and CO2 solid-state reaction at low temperature. ChemPhysChem, 2014, 16 (43), pp.23604. ⟨10.1039/c4cp02414a⟩. ⟨hal-01082379⟩
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