Gas-phase elemental mercury capture by a V2O5/AC catalyst

Gas-phase elemental mercury capture by a V2O5/AC catalyst
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V2O5/AC 催化剂捕获气相元素汞

DOI:
10.1016/j.fuproc.2010.01.017
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发表时间:
2010-06
影响因子:
7.5
通讯作者:
Liu, Zhenyu
Liu, Zhenyu
中科院分区:
工程技术1区
文献类型:
--
作者:
Yang, Jianli;Wang, Junwei;Liu, Zhenyu

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研究了活性焦(AC)负载V2O5(V2O5/AC)催化剂在模拟烟气中对气相元素汞(Hg0)的捕集作用,并与AC催化剂进行了比较。研究了V2O5负载量、温度、捕集时间和烟气成分(O2、SO2、H2O、N2)对Hg0的影响,结果表明,V2O5/AC对Hg0的捕集能力远高于AC。它随着V2O5负载量的增加而增加,并受到O2的促进,这表明V2O5在Hg0氧化和捕获中起着重要的作用;SO2略有促进作用,H2O则抑制;当汞解吸开始时,随着温度的升高,V2O5的作用增加。X射线光电子能谱分析和连续化学萃取实验表明,V2O5/AC上捕获的汞主要以HgO和HgSO4形式存在。还进行了程序升温脱附实验,以了解捕获的汞的稳定性。
Gas-phase elemental mercury (Hg0) capture by an activated coke (AC) supported V2O5(V2O5/AC) catalyst was studied in simulated flue gas and compared with that by the AC. The study on the influences of V2O5loading, temperature, capture time and flue gas components (O2, SO2, H2O and N2) shows that the Hg0capture capability of V2O5/AC is much higher than that of AC. It increases with an increase in V2O5loading and is promoted by O2, which indicates the important role of V2O5in Hg0oxidation and capture; it is promoted slightly by SO2but inhibited by H2O; it increases with an increase in temperature up to 150°C when Hg desorption starts. X-ray photoelectron spectroscopy analysis and sequential chemical extraction experiments indicate that the main states of Hg captured on V2O5/AC are HgO and HgSO4. Temperature programmed desorption experiments were also made to understand the stability of the Hg captured.
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