Radiolytic Approach for Efficient, Selective and Catalyst‐free CO2 Conversion at Room Temperature. Issue 18 (19th August 2021)

• Record Type: Journal Article
• Authors: Hu, Changjiang; Al Gharib, Sarah; Wang, Yunlong; Gan, Pingping; Li, Qiuhao; Denisov, Sergey A.; Le Caer, Sophie; Belloni, Jacqueline; Ma, Jun; Mostafavi, Mehran
• Is Part Of: Chemphyschem. Volume 22:Issue 18(2021)
• Page Start: 1900
• Page End: 1906
• Publication Date: 2021-08-19
• Subjects: CO2 conversion -- Oxalate -- CO2 radiolysis -- CO2 reduction -- Catalyst free; Chemistry, Physical and theoretical -- Periodicals; 541.05
• DOI: 10.1002/cphc.202100378
• Languages: English
• ISSNs: 1439-4235

Abstract

Abstract: The present study proposes a new approach for direct CO2 conversion using primary radicals from water irradiation. In order to ensure reduction of CO2 into CO2 −. by all the primary radiation‐induced water radicals, we use formate ions to scavenge simultaneously the parent oxidizing radicals H . and OH . producing the same transient CO2 −. radicals. Conditions are optimized to obtain the highest conversion yield of CO2 . The goal is achieved under mild conditions of room temperature, neutral pH and 1 atm of CO2 pressure. All the available radicals are exploited for selectively converting CO2 into oxalate that is accompanied by H2 evolution. The mechanism presented accounts for the results and also sheds light on the data in the literature. The radiolytic approach is a mild and scalable route of direct CO2 capture at the source in industry and the products, oxalate salt and H2, can be easily separated. Abstract : Radiolysis of CO2 ‐saturated solutions of sodium formate at pH=7. The sodium oxalate is produced either from solvated electrons scavenging by CO2 or from OH . and H . radicals scavenging by formate. Dihydrogen is also produced from H . radical scavenging by formate and as a primary product of water radiolysis.