Abstract
The reactivity of with CD4 has been experimentally investigated for its relevance in the chemistry of plasmas used for the conversion of CO2 in carbon-neutral fuels. Non-equilibrium plasmas are currently explored for their capability to activate very stable molecules (such as methane and carbon dioxide) and initiate a series of reactions involving highly reactive species (e.g., radicals and ions) eventually leading to the desired products. Energy, in the form of kinetic or internal excitation of reagents, influences chemical reactions. However, putting the same amount of energy in a different form may affect the reactivity differently. In this paper, we investigate the reaction of with methane by changing either the kinetic energy of or its vibrational excitation. The experiments were performed by a guided ion beam apparatus coupled to synchrotron radiation in the VUV energy range to produce vibrationally excited ions. We find that the reactivity depends on the reagent collision energy, but not so much on the vibrational excitation of . Concerning the product branching ratios (//DOCO+) there is substantial disagreement among the values reported in the literature. We find that the dominant channel is the production of , followed by DOCO+ and , as a minor endothermic channel.
Highlights
The chemistry of the CO+2 cation attracts much attention because of the presence of this ion in planetary atmospheres
Because vibrationally excited levels of CO+2 can be populated in plasmas, this study aims at investigating the effect of the vibrational excitation of the CO+2 cation on the reaction with CH4
For most of the other products, reactive cross sections were measured at two different collision energies ECM = 0.17 ± 0.02 eV and 1.34 ± 0.01 eV and results are shown in Figures 4, 5
Summary
The chemistry of the CO+2 cation attracts much attention because of the presence of this ion in planetary atmospheres (with particular reference to the Earth and Mars Matta et al, 2013; Tenewitz et al, 2018 as well as in laboratory plasmas for energetic and environmental applications Snoeckx and Bogaerts, 2017). In the latter field, the efficient conversion of greenhouse gases into valueadded chemicals is a central topic in current research on renewable and sustainable energies (Wang et al, 2017). Because vibrationally excited levels of CO+2 can be populated in plasmas, this study aims at investigating the effect of the vibrational excitation of the CO+2 cation on the reaction with CH4
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