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Promotional Effect of Molybdenum Additives on Catalytic Performance of CeO2/Al2O3 for Selective Catalytic Reduction of NOx

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Abstract

A series of CeO2/Al2O3 and CeMoxOy/Al2O3 catalysts were prepared by an extrusion method for selective catalytic reduction of NOx, and were characterized by techniques of XRD, XPS, N2-BET, H2-TPR and NH3-TPD. Promotional effects of molybdenum additives on catalytic performances and tolerances toward SO2 and H2O poisoning of the catalysts were comparatively studied. Results showed that the CeO2/Al2O3 catalyst with the Ce/Al molar ratio of 1:5 exhibited the best catalytic performance; molybdenum additives greatly improved catalytic performance of the CeMoxOy/Al2O3 catalysts, and the catalyst with the Al/Ce/Mo molar ratio of 5:1:0.15 calcinated at 550 °C exhibited the highest catalytic activity above 95 % in active temperature window of 250–430 °C under the gas hourly space velocity (GHSV) of 7200 h−1. Moreover, molybdenum additives broadened the range of the active temperature, and significantly enhanced the anti-sulfur poisoning ability. Analysis showed that the promotional effects of molybdenum additives were attributed to the improvement of specific surface area, increment of surface acidity and the enhancement of the redox properties.

Graphical Abstract

The molybdenum additives significantly increase the catalytic performance of CeO2/Al2O3 for selective catalytic reduction of NOx and greatly broaden the range of the active temperature. The reasons mainly due to molybdenum additives improve the specific surface area, increase the proportion of Ce3+/(Ce4++Ce3+) and Oα/(Oα + Oβ) on the surface, and enhance the amount of the Lewis acid sites.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (Nos. 51272105), Jiangsu Provincial Science and Technology Supporting Program (BE2013718), Research Subject of Environmental Protection Department of Jiangsu Province of China (2013006), Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).

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Authors and Affiliations

  1. Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites, Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), State Key Laboratory of Materials-Oriented Chemical Engineering, College of Materials Science and Engineering, Nanjing Tech University, No. 5 Xinmofan Road, Nanjing, 210009, People’s Republic of China

    Wei Yan, Yuesong Shen, Shemin Zhu, Qijie Jin & Youlin Liu

  2. Shandong Gemsky Environmental Technology Co, Zibo, 255086, People’s Republic of China

    Xihong Li

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  1. Wei Yan
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  2. Yuesong Shen
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  3. Shemin Zhu
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  4. Qijie Jin
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  5. Youlin Liu
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  6. Xihong Li
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Correspondence to Yuesong Shen.

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Yan, W., Shen, Y., Zhu, S. et al. Promotional Effect of Molybdenum Additives on Catalytic Performance of CeO2/Al2O3 for Selective Catalytic Reduction of NOx . Catal Lett 146, 1221–1230 (2016). https://doi.org/10.1007/s10562-016-1739-0

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  • DOI: https://doi.org/10.1007/s10562-016-1739-0

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