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    Synergy of CuO and CeO2 combination for mercury oxidation under low-temperature selective catalytic reduction atmosphere

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    Type
    Article
    Authors
    Li, Hailong
    Zhu, Lei
    Wu, Shaokang
    Liu, Yang
    Shih, Kaimin
    KAUST Department
    Advanced Membranes and Porous Materials Research Center
    Date
    2016-07-20
    Online Publication Date
    2016-07-20
    Print Publication Date
    2017-02
    Permanent link to this record
    http://hdl.handle.net/10754/617281
    
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    Abstract
    Synergy for low temperature Hg0 oxidation under selective catalytic reduction (SCR) atmosphere was achieved when copper oxides and cerium oxides were combined in a CuO-CeO2/TiO2 (CuCeTi) catalyst. Hg0 oxidation efficiency as high as 99.0% was observed on the CuCeTi catalyst at 200 °C, even the gas hourly space velocity was extremely high. To analyze the synergistic effect, comparisons of catalyst performance in the presence of different SCR reaction gases were systematically conducted over CuO/TiO2 (CuTi), CeO2/TiO2 (CeTi) and CuCeTi catalysts prepared by sol-gel method. The interactions between copper oxides and cerium oxides in CuCeTi catalyst yielded more surface chemisorbed oxygen, and facilitated the conversion of gas-phase O2 to surface oxygen, which are favorable for Hg0 oxidation. Copper oxides in the combination interacted with NO forming more chemisorbed oxygen for Hg0 oxidation in the absence of gas-phase O2. Cerium oxides in the combination promoted Hg0 oxidation through enhancing the transformations of NO to NO2. In the absence of NO, NH3 exhibited no inhibitive effect on Hg0 oxidation, because enough Lewis acid sites due to the combination of copper oxides and cerium oxides scavenged the competitive adsorption between NH3 and Hg0. In the presence of NO, although NH3 lowered Hg0 oxidation rate through inducing reduction of oxidized mercury, complete recovery of Hg0 oxidation activity over the CuCeTi catalyst was quickly achieved after cutting off NH3. This study revealed the synergistic effect of the combination of copper oxides and cerium oxides on Hg0 oxidation, and explored the involved mechanisms. Such knowledge would help obtaining maximum Hg0 oxidation co-benefit from SCR units in coal-fired power plants.
    Citation
    Synergy of CuO and CeO2 combination for mercury oxidation under low-temperature selective catalytic reduction atmosphere 2016 International Journal of Coal Geology
    Sponsors
    This project was supported by the National Natural Science Foundation of China (NO. 51476189), the Hong Kong General Research Fund Scheme (No. 17206714), the Hong Kong Scholar Program (NO. XJ2014033), and the Key Research and Development Program of Hunan Province (No. 2015SK2007).
    Publisher
    Elsevier BV
    Journal
    International Journal of Coal Geology
    DOI
    10.1016/j.coal.2016.07.011
    Additional Links
    http://linkinghub.elsevier.com/retrieve/pii/S0166516216303810
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.coal.2016.07.011
    Scopus Count
    Collections
    Articles; Advanced Membranes and Porous Materials Research Center

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