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Manganese-rich MnSAPO-34 molecular sieves as an efficient catalyst for the selective catalytic reduction of NO x with NH3: one-pot synthesis, catalytic performance, and characterization

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Abstract

Manganese-rich MnSAPO-34 molecular sieves were prepared by one-pot synthesis method for NO x abatement using the ammonia-selective catalytic reduction (NH3-SCR) technology and characterized using ICP, BET, XRD, FE-SEM, H2-TPR, NH3-TPD, XPS, and DR UV-Vis analyses. The experimental results indicate that the Mn content and chemical state, as well as the surface acidity, of the MnSAPO-34 molecular sieves significantly enhance their DeNO x efficiency at low temperatures (ca. 200–300 °C). The manganese-rich MnSAPO-34 was synthesized using a combination of triethylamine and diisopropylamine as the structural directing agents and high Mn loading (n(MnO)/n(P2O5) = 0.4). The resulting catalyst exhibits the highest activity among all of the samples with a NO x conversion value of nearly 95% and a N2 selectivity that is higher than 90% at 220–400 °C. In addition, this catalyst presents higher NO x conversion than the conventional V2O5-WO3/TiO2 catalysts and other SAPO-based catalysts below 300 °C. Furthermore, the analytical results indicate that the manganese species in the catalyst are mainly in the form of a framework Mn(IV), which could play a significant role in the NH3-SCR process as the specific active species. The results suggest that controlling the types and content of the organic amine templates and variations in the surface acidity of the catalysts may significantly enhance the SCR activity at lower temperatures.

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Acknowledgements

This research was financially supported by the National Natural Science Foundation of China (NSFC-51478191) and Science and Technology Project of Guangdong Province (2014A020216003).

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Authors and Affiliations

  1. School of Environment and Energy, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, People’s Republic of China

    Chenglong Yu, Feng Chen, Lifu Dong, Xiaoqing Liu, Bichun Huang, Xinnan Wang & Shengbang Zhong

  2. Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control, South China University of Technology, Guangzhou Higher Education Mega Centre, Guangzhou, 510006, People’s Republic of China

    Bichun Huang

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  1. Chenglong Yu
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  2. Feng Chen
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  3. Lifu Dong
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  4. Xiaoqing Liu
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  7. Shengbang Zhong
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Correspondence to Bichun Huang.

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Yu, C., Chen, F., Dong, L. et al. Manganese-rich MnSAPO-34 molecular sieves as an efficient catalyst for the selective catalytic reduction of NO x with NH3: one-pot synthesis, catalytic performance, and characterization. Environ Sci Pollut Res 24, 7499–7510 (2017). https://doi.org/10.1007/s11356-017-8375-0

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