Tachikawa H. Activation of CO
2 in Photoirradiated CO
2-H
2O Clusters: Direct Ab Initio Molecular Dynamics (MD) Study.
J Phys Chem A 2019;
123:4743-4749. [PMID:
31025865 DOI:
10.1021/acs.jpca.9b03823]
[Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Carbon dioxide (CO2) is one of the stable and inactive molecules that contribute to greenhouse gases. The development of new reactions of CO2 activation, chemical fixation, and conversion is a very important issue. In this report, the reactions of CO2-H2O binary clusters were investigated using a direct ab initio molecular dynamics (AIMD) method to find a new reaction of CO2 activation. Clusters composed of carbon dioxide and water molecules, CO2(H2O) n ( n = 2-5), were utilized as a model of the binary cluster. The reaction dynamics of [CO2(H2O) n]+ following the ionization of parent neutral clusters were also investigated. Two electronic states of [CO2(H2O) n]+ were examined for direct AIMD surfaces: CO2[(H2O) n]+ (ground state) and (CO2)+(H2O) n (excited charge transfer (CT) state). After the ionization of the clusters, a proton-transfer (PT) reaction occurred within the (H2O) n+ moiety at the ground state, whereas the reactive HCO3 radical was formed at the CT state for OH addition to CO2+: CO2+(H2O) n → HCO3 + H+(H2O) n-1. The mechanisms of the PT process and the HCO3 radical formation were discussed based on the theoretical results.
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