Pulse radiolysis of sodium formate aqueous solution up to 400 C; Absorption spectra, kinetics and yield of carboxyl radical CO

Lin, M.; Katsumura, Yosuke; Muroya, Yusa*; He, H.*; Miyazaki, Toyoaki*; Hiroishi, Daisuke*

Sodium formate neutral aqueous solutions saturated with NO were studied by pulse radiolysis techniques from room temperature to 400 C. The absorption spectra of CO show a red shift from = 235 nm at 25 C to 280 nm at 400 C. The second-order decay of CO is not monotonically temperature-dependent: the rate constant (2/) slightly increases with temperature up to 200 C, then decreases to a valley at 300 C, and it sharply increases again for temperature 350 C. (CO) increases with temperature from room temperature to 400 C. Significant density effect on (CO) is found at 400 C. Assumed (CO) is independent on temperature, at 400 C, the density dependence of (CO) in the presence of NO agrees well with that of [(e)+(H)+(OH)].