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Citation: Sun Shi-Gang, Yang Dong-Fang, Tian Zhao-Wu. IN-SITU FTIR Studies on Adsorption and Oxidation of 1,2-Propanediol at a Platinum Electrode in Acid Solutions[J]. Acta Physico-Chimica Sinica, ;1992, 8(01): 59-63. doi: 10.3866/PKU.WHXB19920112 shu

IN-SITU FTIR Studies on Adsorption and Oxidation of 1,2-Propanediol at a Platinum Electrode in Acid Solutions

1.
State Key Laboratory for Physical Chemistry of the Solid Surface, Department of Chemistry, Xiamen University, Xiamen 361005

Received Date: 13 July 1990
Available Online: 15 February 1992

Adsorption and oxidation of 1,2-propanediol at a platinum electrode in acid solutions were investigated by cyclic voltammetry and in-situ FTIR spectroscopy. The results demonstrated that 1,2-propanediol oxidized on Pt electrode via a dual path reaction mechanism. 1,2-propanediol may be oxidized into CO_2 through its disso-ciative products on Pt surface. But at lower potentials these dissociative products, which were mainly CO_(ad) and[﹥C=CH_2]_(ad) as detected by in situ-FTIR spectroscopy, may adsorb strongly and accumulate on electrode, empoisoning Pt electrode and suppressing consequently other reactions. However all dissociative products may be oxidized and desorbed from Pt surface when E>0.3 V, which reactivates Pt electrode and enables that 1,2-propanediol oxidizes via reactive intermediates into CO_2. The reactive intermediates were detected by in-situ FTIR spectroscopy under present conditions as OHC—CHOHCH_3 (or CH_2OH—COCH_3) and HOOC—COCH_3 (or HOOC—COCH_3) species.
- 1,2-propanediol; Dissociative adsorption; Electrooxidation; in situ FTIR spectroscopy
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