Reaction of SO₂ with sodium chlorate powder triggering oxidation of NO and Hg⁰

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• 作者：Youngchul Byun^a ; Jeonghyun Kim^b ; Dongnam Shin^c ; ^{jydnshin@rist.re.kr}
• 关键词：Sodium chlorate ; Sulfur dioxide ; Nitrogen monoxide ; Elemental mercury ; Removal ; Oxidation
• 刊名：Chemical Engineering Journal
• 出版年：2012
• 出版时间：1 May, 2012
• 年：2012
• 卷：189-190
• 期：Complete
• 页码：5-12
• 全文大小：1469 K

文摘

This study investigated the reaction of powdered sodium chlorate (NaClO₃(s)) with air pollutants. 200 ppm SO₂, 200 ppm NO, and 260 ¦Ìg/N m³ Hg⁰ in 2.6 L/min of N₂ balance were introduced into a reactor containing 2.4 g of NaClO₃(s). Results showed that SO₂ has reacted exclusively with NaClO₃(s) to produce Na₂SO₄(s) above 220 ¡ãC, whereas NO and Hg⁰ themselves have no reactivity toward NaClO₃(s). However, oxidation of NO and Hg⁰ occurred when they were introduced with SO₂ into the reactor containing NaClO₃(s). NO₂ as a radical scavenger was introduced at the forward and backward positions of reactor to determine which species are responsible for the oxidation of NO and Hg⁰ during the reaction of SO₂ with NaClO₃(s), where ClONO₂, ClNO₂, and OClO species were observed. Kinetic simulations were also conducted to elucidate reactions between chlorine species, where final products were nearly Cl₂ on both OClO + Cl and OClO + ClO reactions when reaction time was 2.4 s. These suggest that OClO, ClO, and Cl generated during the reaction of SO₂ with NaClO₃(s) can oxidize NO to NO₂ and Hg⁰ to Hg²⁺.