Removal and recovery of gas-phase element mercury by metal oxide-loaded activated carbon
Removal and recovery of gas-phase element mercury by metal oxide-loaded activated carbon
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DOI：
10.1016/j.jhazmat.2007.07.038
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发表时间：
2008-04-01
影响因子：
13.6
通讯作者：
Zhang, Yejian
中科院分区：
文献类型：
--
作者：
Mei, Zhijian;Shen, Zhemin;Zhang, Yejian
采用实验室规模的固定床反应器，在模拟烟气条件下，研究了负载Co 3 O 4（AC-Co）、MnO 2（AC-Mn）和CuCoO 4（AC-CC）活性炭的可重复使用性及其对单质汞的去除效果。试验表明，在673 K、N2气氛下加热再生废AC-Co，富集再生的Hg-0可回收，消除二次污染。由于活性炭的分解和MnO 2晶体结构的变化，再生后的活性炭-锰和活性炭-CC对Hg-0的去除率大大降低。与活性炭和金属氧化物相比，负载金属氧化物的活性炭由于其巨大的比表面积和大量的官能团，具有更高的Hg-0捕集能力和容量。TGA分析结果表明，AC-Co和。在523 K时，活性炭-锰对HgO的吸附容量分别为19.8 mg g（-1）和5.21 mg g（-1）。较高的负载量和吸附温度有利于AC-Co对Hg-0的去除。然而，CuCoO 4和MnO 2的AC分解能力分别对AC-CC和AC-Mn的性能产生负面影响，特别是在高吸附温度和高负载值下。SO_2试验表明，AC-CC的抗SO_2中毒能力高于AC-Co和AC-Mn。(c)2007 Elsevier B. V.保留所有权利。
The reusability Of Co3O4 (AC-Co), MnO2 (AC-Mn) and CuCoO4 (AC-CC) loaded activated carbon (AC) and their element mercury removal efficiency had been studied using a laboratory-scale fixed-bed reactor under simulated flue gas conditions. Tests showed that spent AC-Co could be regenerated through heating at 673 K under N-2 atmosphere and the enrichment regenerated Hg-0 could be collected to eliminate the secondary pollution. Regenerated AC-Mn and AC-CC's Hg-0 removal efficiency decreased greatly due to AC's decomposition and MnO2's crystal structure variation. Compared with AC and metal oxides, metal oxide-loaded AC had higher Hg-0 capture ability and capacity due to AC huge surface areas and lots of function groups. TGA analysis results showed that AC-Co and. AC-Mn's HgO adsorptive capacity at 523 K reached 19.8 mg g(-1) and 5.21 mg g(-1), respectively. High loading values and adsorption temperatures were beneficial to AC-Co's Hg-0 removal efficiency. However, CuCoO4 and MnO2's AC decomposition ability had negative effect on AC-CC and AC-Mn's performance, respectively, especially at high adsorption temperatures and loading values. SO2 tests showed that AC-CC had higher anti SO2-poisoning ability than AC-Co and AC-Mn. (c) 2007 Elsevier B.V. All rights reserved.