The cooperation of FeSn in a MnOx complex sorbent used for capturing elemental mercury
The cooperation of FeSn in a MnOx complex sorbent used for capturing elemental mercury
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FeSn 在用于捕获元素汞的 MnOx 复合吸附剂中的配合
DOI：
10.1016/j.fuel.2014.10.004
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发表时间：
2015-01
期刊：
影响因子：
7.4
通讯作者：
Yan, Naiqiang
中科院分区：
文献类型：
--
作者：
Zhao, Songjian;Chen, Wanmiao;Huang, Wenjun;Yan, Naiqiang
氧化锰（MnOx）是一种从燃煤烟气中捕获元素汞（Hg0）的有效吸附剂，但其使用受到其较低孔隙率、较低温度范围和对二氧化硫（SO2）敏感性的明显限制。测试了锡（Sn）和铁（Fe）增强MnOx吸附剂的能力，Fe单键MnOx络合物作为新型汞吸附剂表现出优异的性能。 SnO2 对于 Hg0 吸附似乎是惰性的，但它可以作为分散 MnOx 的合适载体，这有助于产生更多的活化位点。 BET 表面积增加了约 10 倍，Hg0 吸附容量增加了 3 倍。吸附剂的可用温度范围可从 100°C 扩展到 300°C。具体来说，Fe的存在可以显着提高吸附剂的耐SO2性能。此外，通过原位漫反射红外傅里叶变换光谱（DRIFT）研究了高温下的吸附和SO2耐受机制；当O2存在时，Fe与SO2发生反应，可以保护锰活性位点免受SO2的毒害。
Manganese oxide (MnOx) was an effective sorbent for capturing elemental mercury (Hg0) from coal-fired flue gas, but its usage was markedly limited by its lower porosity, lower temperature range, and sensitivity to sulfur dioxide (SO2). Tin (Sn) and iron (Fe) were tested for their ability to enhance MnOxsorbent, and the Fesingle bondSnsingle bondMnOxcomplex exhibited excellent performance as a novel mercury sorbent. SnO2appeared to be inert for Hg0adsorption, but it could act as a suitable support to disperse MnOx, which helps to produce more activated sites. The BET surface areas increased by approximately 10 times, and there was an increase of 3 times the Hg0adsorption capacity. The available temperature range of the sorbent can be extended from 100 to 300 °C. Specifically, the presence of Fe can significantly improve the SO2resistance of the sorbent. Furthermore, the mechanism of adsorption and SO2tolerance at high temperatures was investigated by in situ Diffuse Reflectance Infrared Fourier Transform spectra (DRIFTs); Fe reacted with SO2when O2was present, which could protect manganese active sites from being poisoned by SO2.
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