Catalytic oxidation of gas-phase elemental mercury by nano-Fe2O3
Catalytic oxidation of gas-phase elemental mercury by nano-Fe2O3
复制标题
纳米 Fe2O3 催化氧化气相单质汞。
DOI：
10.1016/s1001-0742(10)60438-x
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发表时间：
2011-01-01
影响因子：
6.9
通讯作者：
Ai, Zhihui
中科院分区：
文献类型：
--
作者：
Kong, Fanhai;Qiu, Jianrong;Ai, Zhihui
在固定床反应器上研究了纳米Fe_2O_3对Hg-0的非均相氧化反应，考察了氧气浓度、床层温度、水蒸气浓度和粒径等因素对反应的影响。结果表明，Hg-0可被纳米Fe 2 O3表面的活性氧原子和纳米Fe 2 O3中的晶格氧氧化。在影响纳米Fe_2O_3氧化Hg-0的因素中，床层温度起着重要的作用。在300 ℃时，超过40%的总汞被氧化，但400 ℃的测试温度会导致纳米催化剂的烧结，从而导致Hg-0氧化效率较低。氧气浓度的增加促进了汞的氧化，提高了Hg-0的氧化效率。在纯N-2气氛中没有检测到明显的汞氧化，这表明在气体流中需要氧气用于汞氧化。水蒸气的存在对汞氧化的影响因其浓度而异。低含量的水蒸气促进汞的氧化，而高含量的水蒸气抑制汞的氧化。
Heterogeneous oxidation of gas-phase Hg-0 by nano-Fe2O3 was investigated on a fixed bed reactor, and the effects of oxygen concentration, bed temperature, water vapour concentration and particle size have been discussed. The results showed that Hg-0 could be oxidized by active oxygen atom on the surface of nano-Fe2O3 as well as lattice oxygen in nano-Fe2O3. Among the factors that affect Hg-0 oxidation by nano-Fe2O3, bed temperature plays an important role. More than 40% of total mercury was oxidized at 300 degrees C, however, the test temperature at 400 degrees C could cause sintering of nano-catalyst, which led to a lower efficiency of Hg-0 oxidation. The increase of oxygen concentration could promote mercury oxidation and led to higher Hg-0 oxidation efficiency. No obvious mercury oxidation was detected in the pure N-2 atmosphere, which indicates that oxygen is required in the gas stream for mercury oxidation. The presence of water vapour showed different effects on mercury oxidation depending on its concentration. The lower content of water vapour could promote mercury oxidation, while the higher content of water vapour inhibits mercury oxidation.