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Issue 21, 2017
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Synthesis of MnNi–SAPO-34 by a one-pot hydrothermal method and its excellent performance for the selective catalytic reduction of NO by NH3

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Abstract

Mn- or/and Ni-modified SAPO-34 molecular sieves (Mn–SAPO-34, Ni–SAPO-34, and MnNi–SAPO-34) were synthesized by a one-pot hydrothermal synthesis method using morpholine as a structure directing agent. XRD, XRF, SEM, TEM-EDX, UV-vis-DRS, NH3-TPD, XPS, NMR, and in situ DRIFTS analyses were performed to study the properties of the samples. The MnNi–SAPO-34 catalyst demonstrated much better NOx conversion (>95%) and N2 selectivity (>98%) for the selective catalytic reduction (SCR) of NOx by NH3 than those of the other catalysts from 320 °C to 470 °C. Moreover, NOx conversion could still be maintained at about 100% at 380 °C even after 80 h over MnNi–SAPO-34. Its excellent activity can be ascribed to the strong interaction between the Mn and Ni species in the framework of MnNi–SAPO-34, leading to the suitable redox ability of MnNi–SAPO-34 by the reaction Ni3+ + Mn3+ ↔ Ni2+ + Mn4+. The in situ DRIFTS results suggested that the NH3-SCR reaction was mainly performed by an Eley–Rideal (E–R) reaction pathway at 300 °C for the MnNi–SAPO-34 catalyst. Thus, MnNi–SAPO-34 is considered as a promising candidate for controlling NOx emissions at middle temperatures.

Graphical abstract: Synthesis of MnNi–SAPO-34 by a one-pot hydrothermal method and its excellent performance for the selective catalytic reduction of NO by NH3

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Publication details

The article was received on 25 Jul 2017, accepted on 28 Sep 2017 and first published on 29 Sep 2017


Article type: Paper
DOI: 10.1039/C7CY01507K
Citation: Catal. Sci. Technol., 2017,7, 4984-4995
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    Synthesis of MnNi–SAPO-34 by a one-pot hydrothermal method and its excellent performance for the selective catalytic reduction of NO by NH3

    R. Li, Z. Li, L. Chen, Y. Dong, S. Ma, F. Yuan and Y. Zhu, Catal. Sci. Technol., 2017, 7, 4984
    DOI: 10.1039/C7CY01507K

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