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Preparation of nanosheet Fe-ZSM-5 catalysts, and effect of Fe content on acidity, water, and sulfur resistance in the selective catalytic reduction of NO x by ammonia

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Abstract

Direct synthesis of nanosheet Fe-ZSM-5 catalysts and their use for selective catalytic reduction (SCR) of NO x by ammonia were studied. XRD, BET, SEM, EPR, and NH3-TPD were used to understand the properties of catalysts with different iron loading. XRD confirmed the presence of the ZSM-5 crystal phase, and there was no Fe2O3 phase on the surface of the crystals. SEM showed the Fe-ZSM-5 catalysts comprised microspheres made up of nanosheets. EPR indicated that the iron was present as isolated Fe3+and FeO x oligomers uniformly dispersed throughout the crystals. NH3-TPD indicated that Fe-ZSM-5 (20,1:1) had maximum acid sites and density at approximately 250 and 450 °C, respectively. Fe-ZSM-5 (20,1:1) had the highest activity in the SCR reaction with NH3. It was also confirmed that Fe-ZSM-5 (20,1:1) had excellent resistance to SO2 and H2O under the SCR reaction conditions. The effects of water vapor and SO2, iron loading, and the Si/(Fe + Al) ratio were also investigated for these catalysts.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (no. 51078185 and no. 51106076).

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Authors and Affiliations

  1. School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094, China

    Luoning Ma, Hongxia Qu, Jie Zhang, Qisheng Tang, Shule Zhang & Qin Zhong

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  1. Luoning Ma
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  2. Hongxia Qu
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  3. Jie Zhang
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  4. Qisheng Tang
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Correspondence to Hongxia Qu.

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Ma, L., Qu, H., Zhang, J. et al. Preparation of nanosheet Fe-ZSM-5 catalysts, and effect of Fe content on acidity, water, and sulfur resistance in the selective catalytic reduction of NO x by ammonia. Res Chem Intermed 39, 4109–4120 (2013). https://doi.org/10.1007/s11164-012-0927-9

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