Effects of activated Mn3O4 on the decomposition characteristics of SO21

The manganese oxide Mn 3 O 4 was synthesized in the reactions of MnCl 2 . 4H 2 O with NaOH in which the ratios of 2NaOH to MnCl 2 were 0.50, 0.75, 1.00, 1.25, and 1.50, respectively. It was characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). In addition, the surface areas were measured by Brunauer, Emmett, and Teller (BET) methods. The manganese oxide was activated by reduction with H 2 gas in a reactor, and the activated factor was investigated by thermogravimetric analysis (TGA). Globular-shaped particles of Mn 3 O 4 were observed in all the synthesized samples and their surface areas ranged from 13.92 to 32.33 m 2 /g and then from 13.60 to 24.67 m 2 /g after the decomposition reaction of sulfur dioxide. The activated factors (δ) measured were 0.012 to 0.135, and the sulfur dioxide decomposed rapidly when the Mn 3 O 4 synthesized with ratios (2NaOH/MnCl 2 ) of 0.50 and 0.75 was applied.