Journal
JOURNAL OF ENVIRONMENTAL SCIENCES
Volume 104, Issue -, Pages 137-149Publisher
SCIENCE PRESS
DOI: 10.1016/j.jes.2020.11.018
Keywords
SAPO-34; Transition metals; Low-temperature activity; Fast SCR; Surface species
Categories
Funding
- National Natural Science Foundation of China [51702215]
- Science and Technology Department of Zhejiang Province [LGG19B070002, 2020C01134]
- Science and Technology Program of Shaoxing [2017B70051]
- Shaoxing University [2016LG1001]
- National Training Programs of Innovation and Entrepreneurship for Undergraduates [202010349023]
- Key Innovation Project of Qinghai Provincial Science and Technology Department [2016-GX-116]
- National Key R&D Program of China [2017YFC0211202]
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Mn/SAPO-34 catalyst shows superior low-temperature activity in the selective catalytic reduction of nitrogen oxides with ammonia and differs significantly from Ni/SAPO-34 and Co/SAPO-34 in terms of active species state and distribution. Surface MnOx species play a crucial role in NO oxidation and NO2 adsorption.
Me/SAPO-34 (Me = Mn, Ni, Co) series of catalysts were prepared by a wetness impregnation method and investigated for the selective catalytic reduction of nitrogen oxides with ammonia (NH3-SCR). Among them, Mn/SAPO-34 catalyst was found as the most promising candidate based on its superior low-temperature activity. The catalysts were characterized by X-ray diffraction (XRD), transmission electron microscopy images (TEM), nuclear magnetic resonance (NMR), X-ray photoelectron spectroscopy (XPS), temperature programmed reduction and desorption (TPR and TPD), and diffuse reflectance infrared Fourier transformed spectroscopy (DRIFTS) of NH3/NOx adsorption. Mn/SAPO-34 is obviously different from Ni/SAPO-34 and Co/SAPO-34 in the active species state and distribution. Surface MnOx species which play an essential role in NO oxidation and NO2 adsorption, act as better active sites than nickel and cobalt mostly in the form of the aluminates and silicates. (C) 2020 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
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