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Promotional effect of Ba additives on MnCeOx/TiO2 catalysts for NH3-SCR of NO at low temperature

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Abstract

A series of Ba-modified MnCeOx/TiO2 catalysts were prepared by a wet impregnation method and tested for selective catalytic reduction (SCR) of NO with NH3 at low temperature. The results showed that Ba additives obviously improved the catalytic performance of the MnCeOx/TiO2 catalyst for NH3-SCR, and the BaMnCeOx/TiO2 catalyst with 3 wt% BaO exhibited the optimal catalytic performance. Moreover, the introduction of Ba also improved the resistances toward water vapor and SO2 of catalysts. The N2 adsorption, H2-TPR, and X-ray photoelectron spectroscopy results showed that the addition of Ba increased the specific surface area, redox properties, and concentrations of surface Mn4+ and chemisorbed oxygen of catalysts. Furthermore, NH3-TPD and NO-TPD were used to investigate the absorption of NH3 and NO on the catalyst. The results revealed that although the introduction of Ba significantly promoted the adsorption of NO, it also inhibited the adsorption of NH3. Consequently, the catalytic performance of MnCeOx/TiO2 was greatly improved with the Ba additives.

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ACKNOWLEDGMENTS

This work was supported by the National Key Research and Development Program of China (No. 2016YFC0205500), the National Natural Science Foundation of China (51772149), the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), and Postgraduate Research & Practice Innovation Program of Jiangsu Province.

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Authors and Affiliations

  1. College of Materials Science and Engineering, Nanjing Tech University, Nanjing, 210009, China

    Youchun Pan, Yuesong Shen, Qijie Jin & Shemin Zhu

  2. Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, Nanjing Tech University, Nanjing, 210009, China

    Youchun Pan, Yuesong Shen, Qijie Jin & Shemin Zhu

  3. Jiangsu National Synergetic Innovation Center for Advanced Materials, Nanjing Tech University, Nanjing, 210009, China

    Youchun Pan, Yuesong Shen, Qijie Jin & Shemin Zhu

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  1. Youchun Pan
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Correspondence to Yuesong Shen.

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Pan, Y., Shen, Y., Jin, Q. et al. Promotional effect of Ba additives on MnCeOx/TiO2 catalysts for NH3-SCR of NO at low temperature. Journal of Materials Research 33, 2414–2422 (2018). https://doi.org/10.1557/jmr.2018.179

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