• 关键词：MnO₂/AC  Hg⁰  吸附  氧化  活性焦

• 基金项目：安徽省高等学校省级自然科学研究项目 (No. kj2012b085);国家自然科学基金项目 (No. 21001007, 21001008)

• 王钧伟
• 1. 安庆师范学院 化学化工学院,安庆 246011;
  2. 安庆师范学院 光电磁功能配合物和纳米配合物安徽省重点实验室,安庆 246011

• 刘瑞卿
• 山西大学 环境与资源学院,太原 030006

• 摘要：研究了活性焦 (AC) 及负载MnO₂的活性焦 (MnO₂/AC) 对气态Hg⁰的吸附脱除,发现负载MnO₂到AC明显提高了其对Hg⁰的吸附脱除能力.考察了MnO₂负载量、温度、Hg⁰浓度和烟气成分等对MnO₂/AC吸附脱除Hg⁰的影响.结果表明,MnO₂/AC对Hg⁰的吸附脱除能力随MnO₂负载量的增加而增强;在120~200 ℃的温度范围内,随着温度升高,MnO₂/AC对Hg⁰的吸附脱除能力增强;O₂和HCl对MnO₂/AC吸附脱除Hg⁰具有促进作用,而SO₂和H₂O具有抑制作用.SEM-EDX和逐级化学提取结果证实,MnO₂将Hg⁰催化氧化为HgO并吸附在AC上,这是MnO₂/AC具有较高的吸附脱除Hg⁰能力的原因.

• Abstract：Gas-phase Hg⁰ removal by an activated coke (AC) and an activated coke-supported MnO₂ catalyst (MnO₂/AC) were studied. The influences of MnO₂ loading, temperature, inlet Hg⁰ concentration and flue gas components on Hg⁰ removal were characterized. It was found that MnO₂/AC had a much higher Hg⁰ removal capability than AC, which can be attributed to the oxidation activity of MnO₂. The capability increased with an increase of MnO₂ loading in the range of 1%~10%, and it was promoted by O₂ and HCl but inhibited by SO₂ and H₂O. In the stack temperature range (120~200 ℃), MnO₂/AC showed high activity for Hg⁰ removal. Scanning electron microscope-energy dispersive X-ray analysis (SEM-EDX) and sequential chemical extraction experiments confirmed that Hg⁰ can be oxidized by MnO₂ to form HgO and subsequently adsorbed on AC, leading to the high capability of MnO₂/AC for Hg⁰ removal.

• Key words：MnO₂/AC  Hg⁰  adsorption  oxidation  activated coke

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