Proceedings of nanoGe Fall Meeting19 (NFM19)
DOI: https://doi.org/10.29363/nanoge.nfm.2019.054
Publication date: 18th July 2019
Exhaust gases from such as thermal power plants and iron manufactures contained several % - 20% of CO2. Although several methods such as adsorption and desorption methods using amines and membrane filtration have been already developed for enrichment of CO2, these procedures require high energy consumption. If low concentration of CO2 can be directly reduced by artificial methods, it should give a new direction of researches for artificial photosynthesis.
In this presentation, I report such systems using CO2-capturing properties of metal complexes. It has been reported that fac-[ReI(diimine)(CO)3X]n+ can work as both photocatalyst and electrocatalysts for CO2 reduction. We found that the Re complexes also have CO2-capturing properties with the assistance of triethanolamine (TEOA) as shown in the eq.1. Although this reaction is in equilibrium, the equilibrium constant is very large (K = 1.7 x 103 M-1). This means that the Re complex can efficiently capture CO2 from gases containing low concentration of CO2 such as 1% CO2. This type of CO2 adducts work as a catalyst for photochemical reduction of CO2. A Ru(II)-Re(I) supramolecular photocatalyst consisting of a [Ru(diimine)3]+ type photosensitizer unit and the Re complex as a catalyst unit efficiently photocatalyzed reduction of low concentration of CO2 (even 1% CO2).
This work was supported by JSPS KAKENHI Grant Number JP17H06440 in Scientific Research on Innovative Areas "Innovations for Light-Energy Conversion (I4LEC)" and JST CREST (Grant Number JPMJCR13L1).
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