期刊
CHEMICAL ENGINEERING JOURNAL
卷 326, 期 -, 页码 1210-1222出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2017.06.014
关键词
Simultaneous Hg-0 oxidation and NO; conversion; Element mercury; Nitrogen oxide; Mn-0.1/Co-0.3-Ce-0.35-Zr0.35O2
资金
- National Natural Science Foundation of China [51408098]
- Program for Changjiang Scholars [T2012049]
- Education Department of the Liaoning Province of China [LT2015007]
- Support Project of the China Petroleum and Chemical Corporation [X514001]
- Fundamental Research Funds for the Central Universities [DUT16RC(4) 81]
Hg-0 removal with SCR system can result in co-benefits of the apparatus, but the simultaneous removal efficiencies of Hg-0 and NO are not good enough and the mechanism of interaction between Hg-0 and SCR atmosphere has not been well known. In our previous work, Co-0.3-Ce-0.35-Zr0.35O2 has been proved to have an excellent Hg-0 oxidation efficiency. Therefore, in the present work, Co-0.3-Ce-0.35-Zr0.35O2 was used as a support to load SCR active component Mn and to obtain Mn-0.1/Co-0.3-Ce-0.35-Zr0.35O2 catalyst. Mn-0.1/Co-0.3-Ce-0.35-Zr0.35O2 showed excellent simultaneous efficiencies of Hg-0 oxidation (83.6%) and NO conversion (89.4%) at 180 degrees C under a high GHSV 180,000 h(-1). Furthermore, the interaction between Hg-0 and SCR atmosphere lowered the simultaneous efficiencies when compared to the separated ones. The decrease of Hg-0 oxidation efficiency in SCR + Hg-0 atmosphere was mainly attributed to the competitive adsorption between NH3 and Hg-0. Although NO and O-2 were beneficial for Hg-0 oxidation, it could not offset the inhibitive effect of NH3. Meanwhile, HgO accumulated on the catalyst surface resulted in occupation of active sites, which was responsible for the decrease of NO conversion in SCR + Hg-0 atmosphere. The individual gas components (H2O and SO2) showed negative effects on the simultaneous efficiencies of Hg-0 oxidation and NO conversion. (C) 2017 Elsevier B.V. All rights reserved.
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