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Superior activity of iron-manganese supported on kaolin for NO abatement at low temperature

Wang, Xiaobo, Zhou, Jie, Zhao, Tong, Gui, Keting, Wang, Jia and Thomas, Hywel R. ORCID: 2020. Superior activity of iron-manganese supported on kaolin for NO abatement at low temperature. Journal of Environmental Sciences 88 , pp. 237-247. 10.1016/j.jes.2019.08.017

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A series of Fe–Mn catalysts was prepared using different supports (kaolin, diatomite, and alumina) and used for NO abatement via low-temperature NH3-selective catalytic reduction (SCR). The results showed that 12Fe–10Mn/Kaolin (with the concentration of Fe and Mn 12 and 10 wt.%, respectively) exhibited the highest activity, and more than 95.8% NO conversion could be obtained within the wide temperature range of 120–300°C. The properties of the catalysts were characterized by inductively coupled plasma-atomic emission spectrometry (ICP-AES), thermogravimetry (TG), Brunner–Emmet–Teller (BET) measurements, X-ray diffraction (XRD), H2-temperature programmed reduction (H2-TPR), NH3-temperature programmed desorption (NH3-TPD), X-ray photoelectron spectroscopy (XPS), scanning electron microprobe (SEM) and energy dispersive spectroscopy (EDS) techniques. The support effects resulted in significant differences in the components and structures of catalysts. The 12Fe–10Mn/Kaolin catalyst exhibited better dispersion of active species, optimum low-temperature reduction behavior, the largest amount of normalized Brønsted acid sites, and the highest Mn4+/Mn and Fe3+/(Fe3+ + Fe2+), all of which may be major reasons for its superior catalytic activity.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Publisher: Elsevier
ISSN: 1001-0742
Date of Acceptance: 29 August 2019
Last Modified: 26 Oct 2022 08:47

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