Visible‐light Homogeneous Photocatalytic Conversion of CO2 into CO in Aqueous Solutions with an Iron Catalyst. Issue 22 (4th October 2017)

• Record Type: Journal Article
• Authors: Rao, Heng; Bonin, Julien; Robert, Marc
• Is Part Of: ChemSusChem. Volume 10:Issue 22(2017)
• Page Start: 4447
• Page End: 4450
• Publication Date: 2017-10-04
• Subjects: CO2 reduction -- photocatalysis -- porphyrins -- renewable energy -- solar fuels; Green chemistry -- Periodicals; Sustainable engineering -- Periodicals; Chemistry -- Periodicals; Chemical engineering -- Periodicals; 660
• DOI: 10.1002/cssc.201701467
• Languages: English
• ISSNs: 1864-5631

Abstract

Abstract: An iron‐substituted tetraphenyl porphyrin bearing positively charged trimethylammonio groups at the para position of each phenyl ring catalyzes the photoinduced conversion of CO2 . This complex is water soluble and acts as a molecular catalyst to selectively reduce CO2 into CO under visible‐light irradiation in aqueous solutions (acetonitrile/water=1:9 v / v ) with the assistance of purpurin, a simple organic photosensitizer. CO is produced with a catalytic selectivity of 95 % and turnover number up to 120, illustrating the possibility of photocatalyzing the reduction of CO2 in aqueous solution by using visible light, a simple organic sensitizer coupled to an amine as a sacrificial electron donor, and an earth‐abundant metal‐based molecular catalyst. Abstract : Cheap purpurin rocks ! The photocatalytic reduction of CO2 to CO in aqueous solution by a water soluble iron porphyrin is very efficient and selective. In the presence of the cheap organic sensitizer purpurin and triethylamine (TEA), a turnover number of 120 with 95 % selectivity is obtained upon visible light irradiation (>420 nm). The molecular catalyst remains stable for several days under the operating conditions.