Sn-Mn binary metal oxides as non-carbon sorbent for mercury removal in a wide-temperature window.
Sn-Mn binary metal oxides as non-carbon sorbent for mercury removal in a wide-temperature window.
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DOI：
10.1016/j.jcis.2014.04.032
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发表时间：
2014-08
影响因子：
9.9
通讯作者：
Jiangkun Xie;Haomiao Xu;Zan Qu;Wenjun Huang;Wanmiao Chen;Yongpeng Ma;Songjian Zhao;Ping Liu;
中科院分区：
文献类型：
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作者：
Jiangkun Xie;Haomiao Xu;Zan Qu;Wenjun Huang;Wanmiao Chen;Yongpeng Ma;Songjian Zhao;Ping Liu;
采用共沉淀法制备了一系列锡-锰二元金属氧化物。采用粉末X射线衍射仪(粉末X射线衍射仪)、透射电子显微镜(TEM)、程序升温还原(H2-TPR)和NH3-程序升温脱附(NH3-TPD)等方法对脱附剂进行了表征。通过固定床实验考察了所制备的吸附剂对模拟烟气中汞的吸附性能。结果表明，在实验温度范围内，纯SnO2颗粒对汞的吸附作用可以忽略不计，相对而言，MnO2颗粒在低温下的汞吸附容量较高，但随着温度的升高，吸附容量会显著下降。有趣的是，对于锡-锰二元金属氧化物，汞容量不仅在低温下增加，而且在高温下也增加。此外，还考察了SO2对锡-锰二元金属氧化物汞吸附性能的影响，发现低温下的影响与高温下的不同。利用漫反射红外傅里叶变换光谱(DRIFT)对其机理进行了研究。此外，还建立了计算锡到锰二元金属氧化物汞脱附活化能的数学模型。
A series of Sn–Mn binary metal oxides were prepared through co-precipitation method. The sorbents were characterized by powder X-ray diffraction (powder XRD), transmission electronic microscopy (TEM), H2-temperature-programmed reduction (H2-TPR) and NH3-temperature-programmed desorption (NH3-TPD) methods. The capability of the prepared sorbents for mercury adsorption from simulated flue gas was investigated by fixed-bed experiments. Results showed that mercury adsorption on pure SnO2particles was negligible in the test temperature range, comparatively, mercury capacity on MnOxat low temperature was relative high, but the capacity would decrease significantly when the temperature was elevated. Interestingly, for Sn–Mn binary metal oxide, mercury capacity increased not only at low temperature but also at high temperature. Furthermore, the impact of SO2on mercury adsorption capability of Sn–Mn binary metal oxides was also investigated and it was noted that the effect at low temperature was different comparing with that of high temperature. The mechanism was investigated by diffuse reflectance infrared Fourier transform spectroscopy (DRIFTs). Moreover, a mathematic model was built to calculate mercury desorption activation energy from Sn to Mn binary metal oxides.