| Autor: |
Isegawa M; International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University 744 Moto-oka, Nishi-ku Fukuoka 819-0395 Japan isegawa.miho.169@m.kyushu-u.ac.jp., Sharma AK; International Research Center for Elements Science (IRCELS), Institute for Chemical Research (ICR), Kyoto University Uji Kyoto 611-0011 Japan. |
| Jazyk: |
angličtina |
| Zdroj: |
RSC advances [RSC Adv] 2021 Nov 24; Vol. 11 (60), pp. 37713-37725. Date of Electronic Publication: 2021 Nov 24 (Print Publication: 2021). |
| DOI: |
10.1039/d1ra07286b |
| Abstrakt: |
Triethanolamine (TEOA) has been used for the photocatalytic reduction of CO 2 , and the experimental studies have demonstrated that the TEOA increases the catalytic efficiency. In addition, the formation of a carbonate complex has been confirmed in the Re photocatalytic system where DMF and TEOA are used as solvents. In this study, we survey the reaction pathways of the photocatalytic conversions of CO 2 to CO + H 2 O and CO 2 to CO + HCO 3 - by fac -Re(bpy)(CO) 3 Br in the presence of TEOA using density functional theory (DFT) and domain-based local pair natural orbital coupled cluster approach, DLPNO-CCSD(T). Under light irradiation, the solvent-coordinated Re complex is first reduced to form a monoalkyl carbonate complex in the doublet pathway. This doublet pathway is kinetically advantageous over the singlet pathway. To reduce carbon dioxide, the Re complex needs to be reduced by two electrons. The second electron reduction occurs after the monoalkyl carbonate complex is protonated. The second reduction involves the dissociation of the monoalkyl carbonate ligand, and the dissociated ligand recombines the Re center via carbon to generate Re-COOH species, which further reacts with CO 2 to generate tetracarbonyl complex and HCO 3 - . The two-electron reduced ligand-free Re complex converts CO 2 to CO and H 2 O. The pathways leading to H 2 O formation have lower barriers than the pathways leading to HCO 3 - formation, but their portion of formation must depend on proton concentration.
Competing Interests: There are no conflicts of interest to declare.
(This journal is © The Royal Society of Chemistry.) |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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