title: Simultaneous removal of SO2 and NO2 using a Mg-Al oxide slurry treatment.
abstract: SO2 and NO2 were simultaneously removed from a mixed gas using a Mg-Al oxide slurry treatment. Both adsorption to the oxide material itself and dissolution of the gases in the aqueous slurry contributed to the removal. A comparison was made between removal of the two gases separately and the simultaneous process. The removal of SO2 using both the simultaneous and individual process was similar; however, the removal of NO2 was lower for the simultaneous process. For the individual treatments, SO2 and NO2 were separately dissolved in the Mg-Al oxide slurry to produce SO3(2-), NO2(-), and NO3(-), which were subsequently removed by the Mg-Al oxide. However, when the simultaneous process was employed, the dissolved gases were seen to have a significant effect on each other. It was speculated that the production of NO2(-) was increased by the reduction of NO2 by SO3(2-). On increasing the quantity of the Mg-Al oxide, or on raising the temperature of the system, the removal of SO2 increased, with a concurrent decrease in NO2 removal. The increase in removal of SO3(2-) was speculated to hinder the conversion of NO2 to NO2(-), therefore decreasing the removal of the nitrogen species. The results demonstrate that the Mg-Al oxide slurry was highly effective for simultaneously removing NO2 and SO2 from a mixed gas.
authors.affiliation: Graduate School of Environmental Studies, Tohoku University, 6-6-07 Aoba, Aramaki, Aoba-ku, Sendai 980-8579, Japan. Electronic address: kameda@env.che.tohoku.ac.jp.
authors.forename: Tomohito
authors.initials: T
authors.lastname: Kameda
authors.forename: Aki
authors.initials: A
authors.lastname: Kodama
authors.forename: Toshiaki
authors.initials: T
authors.lastname: Yoshioka
mesh_terms: D000393:Air Pollutants / Q000032:analysis / Q000737:chemistry*; D000537:Aluminum Oxide / Q000737:chemistry; D017745:Incineration / Q000379:methods*; D008277:Magnesium Oxide / Q000737:chemistry; D009585:Nitrogen Dioxide / Q000032:analysis / Q000737:chemistry*; D013458:Sulfur Dioxide / Q000032:analysis / Q000737:chemistry*
chemical_list: D000393:Air Pollutants; D013458:Sulfur Dioxide; D008277:Magnesium Oxide; D000537:Aluminum Oxide; D009585:Nitrogen Dioxide
keywords: Mg–Al oxide slurry; NO(2); SO(2); Simultaneous treatment