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Issue 13, 2018
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Fe2O3@SiTi core–shell catalyst for the selective catalytic reduction of NOx with NH3: activity improvement and HCl tolerance

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Abstract

A core–shell structured Fe2O3@SiTi catalyst with a SiTi shell and Fe2O3 core was prepared and used for the selective catalytic reduction (SCR) of NOx with NH3. The thickness of the shell could be well controlled by the amount of TEOS added during the preparation procedure. The catalyst was characterized by techniques including STEM, XRD, BET, NH3-TPD, XPS, and H2-TPR. In comparison with Fe2O3, the Fe2O3@SiTi catalyst presented higher SCR activity, N2 selectivity, better SO2 resistance and HCl tolerance. The characterization results showed that the addition of the SiTi shell onto the Fe2O3 core enlarged the BET specific surface area, increased the number of surface acidic sites, led to the generation of more Fe2+ species and chemisorbed oxygen species, and influenced the reducibility of Fe2O3. The improvement of HCl tolerance of the Fe2O3@SiTi catalyst can be attributed to the fact that the SiTi shell prevents the Fe2O3 core from reacting with HCl to form FeCl3.

Graphical abstract: Fe2O3@SiTi core–shell catalyst for the selective catalytic reduction of NOx with NH3: activity improvement and HCl tolerance

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Publication details

The article was received on 20 Apr 2018, accepted on 09 Jun 2018 and first published on 11 Jun 2018


Article type: Paper
DOI: 10.1039/C8CY00810H
Citation: Catal. Sci. Technol., 2018,8, 3313-3320

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    Fe2O3@SiTi core–shell catalyst for the selective catalytic reduction of NOx with NH3: activity improvement and HCl tolerance

    H. Chang, T. Zhang, H. Dang, X. Chen, Y. You, J. W. Schwank and J. Li, Catal. Sci. Technol., 2018, 8, 3313
    DOI: 10.1039/C8CY00810H

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