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Abstract
A selective catalytic reduction process is generally used to treat NOx; however, this approach results in the leakage of ammonia and requires expensive catalysts. In light of these issues, the specific objective of this study was to develop a new treatment method for a NOx gas stream with a Mg−Al oxide slurry. In this study, we examined the ability of a Mg−Al oxide slurry to treat NO and NO2 gas streams. The Mg−Al oxide slurry only partially removed the NO and NO2. The ability of Mg−Al oxide to remove NO is based on the adsorption of NO molecules onto the surface of the Mg−Al oxide rather than the formation of an Mg−Al layered double hydroxide (Mg−Al LDH) intercalated with NO– 2. NO2 removal was greater than NO removal because of the higher solubility of NO2. For NO2 removal, the Mg−Al oxide adsorbed NO– 2 and NO– 3 onto the surface and formed Mg−Al LDH intercalated with NO– 2 and NO– 3. Based on these results, we conclude that the Mg−Al oxide slurry is an effective treatment for NOx.
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