In:
ChemPhotoChem, Wiley, Vol. 5, No. 8 ( 2021-08), p. 721-726
Abstract:
To overcome the chemical inertness of CO 2 , one strategy consists of pre‐activating or destabilizing it, to lower the reduction barrier, by preparing a carbene‐CO 2 compound where the CO 2 is bent rather than linear. This pre‐activation has been studied in ionic liquids (IL) based on imidazolium as a cation with different anions under conditions of mild pressure, room temperature and UV/Vis light. This screening showed that only 1‐butyl‐3‐methyl‐imidazolium acetate (C 1 C 4 ImOAc) was capable of effectively pre‐activating CO 2 by chemical sorption to give a more reactive 1‐butyl‐3‐methyl‐imidazolium‐2‐carboxylate (C 1 C 4 ImCO 2 ) species. A co‐solvent can be used to consume the photo‐generated holes in Pd/g‐C 3 N 4 as a sacrificial agent but also to provide the protons necessary to reduce CO 2 . In this study, the influence of several type of co‐solvents such as H 2 O, isopropanol (iPrOH), and 1‐(2‐hydroxyethyl)‐3‐methyl imidazolium bis(trifluoromethanesulfonyl)imide [C 1 C 2 (OH)ImNTf 2 ], has been tested on the activation of CO 2 in C 1 C 4 ImOAc. We first defined the optimal molar ratio of co‐solvent to be used in order not to compromise CO 2 pre‐activation for subsequent application in CO 2 transformation. Photocatalytic reductions of CO 2 to CO on Pd/g‐C 3 N 4 by varying different parameters demonstrated that CO 2 pre‐activation in a mixture of C 1 C 4 ImOAc and isopropanol was the most efficient to consider a prospective strategy of CO 2 photoreduction in an IL medium.
Type of Medium:
Online Resource
ISSN:
2367-0932
,
2367-0932
DOI:
10.1002/cptc.202100006
Language:
English
Publisher:
Wiley
Publication Date:
2021
detail.hit.zdb_id:
2881321-2
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