摘要
在模拟烟气中研究了MnOx/α-Al2O3催化剂对烟气零价汞(Hg0)的催化氧化效果,以及反应条件对Hg0氧化率的影响.结果表明,300℃时催化剂的活性最大,模拟烟气含有20mL/m3HCl时Hg0的氧化率达到91%.在8000～32000h-1空速范围内,Hg0氧化率保持在90%以上;空速提高到96000h-1时,氧化率开始下降,并与空速成反比.烟气中的SO2与HCl竞争催化剂上的活性位,对催化氧化反应有一定抑制,500mL/m3SO2使零价汞的氧化率下降约20%.此外,还对MnOx催化氧化零价汞的反应机制进行了探讨.
Manganese oxide impregnated on α-alumina （MnOx/α-Al2O3） was employed as catalyst on the catalytic oxidation of Hg^0 in the presence of hydrogen chloride. The optimized temperature of the catalytic oxidation reaction was around 300℃, where the Hg^0 oxidation efficiency was up to 91% in the presence of 20mL/m^3 HCl. Hg^0 oxidation efficiency was kept over 90% when the space velocity was in range of 8000 h^-1 to 32000 h^-1. However, it decreased quickly when the space velocity was increased from 32000 h^-1 to 96000 h^-1. SO2 inhibited the mercury oxidation by occupying the activity sites on the catalyst, and the oxidation efficiency was reduced by about 20% in the presence of 500mL/m^3 SO2. Meanwhile, the main reaction mechanism of catalytic oxidation was discussed.
出处
《中国环境科学》
EI
CAS
CSCD
北大核心
2009年第3期237-241,共5页
China Environmental Science
基金
国家"863"项目(2007AA06Z340)
关键词
燃煤烟气
Hg0
锰氧化物
催化氧化
coal-fired flue gas： Hg^0： manganese oxide （MnOx）： catalytic oxidation
