Abstract
This study examined the individual and simultaneous adsorption of NO x (NO–NO 2) and SO 2 on activated carbon impregnated with KOH (KOH-IAC). For individual component adsorption, KOH-IAC showed a higher adsorption capacity in NO–NO 2 rich air than in SO 2–air. In the simultaneous adsorption of NO–NO 2–SO 2, SO 2 showed a greater adsorption affinity than NO–NO 2. The smaller the amount of NO–NO 2 adsorbed, the more SO 2 was adsorbed. XPS analysis of the adsorption of NO–NO 2 rich SO 2–air on KOH-IAC revealed that the adsorbed SO 2 was predominantly found on the external surface, producing mainly K 2SO 4 and, additionally, H 2SO 4 and K 2SO 3. Depth profile analysis showed that the amount of SO 2 adsorbed decreased regularly away from the surface, while the amount of adsorbed NO–NO 2 increased irregularly. We confirmed that the presence of the impregnant in KOH-IAC is a determining factor in the adsorption of NO–NO 2 and SO 2 by chemical reaction, clarifying the surface chemical behavior.
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