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Received July 14, 2019
Accepted October 15, 2019
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Precursor and dispersion effects of active species on the activity of Mn-Ce-Ti catalysts for NO abatement
1School of Environmental Science, Nanjing Xiaozhuang University, Nanjing 211171, Jiangsu, China 2Geoenvironmental Research Centre, School of Engineering, Cardiff University, Cardiff, CF24 3AA, UK 3College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, Jiangsu, China 4School of Energy and Environment, Southeast University, Nanjing 210096, Jiangsu, China
xb_wang88@126.com
Korean Journal of Chemical Engineering, December 2019, 36(12), 1991-1999(9), 10.1007/s11814-019-0410-z
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Abstract
Mn-Ce-Ti catalysts were prepared by different precursors (including manganese nitrate, manganese acetate, and manganese chloride) and used for selective catalytic reduction (SCR) of NO with ammonia. The relationships among the structure, physicochemical properties, and catalytic activity were explored by N2 adsorption/desorption, X-ray diffraction (XRD), H2-temperature programmed reduction (H2-TPR), NH3-temperature programmed desorption (NH3- TPD), X-ray photoelectron spectroscopy (XPS), high-resolution transmission electron microscopy (HR-TEM), scanning electron microprobe (SEM) and energy dispersive spectroscopy (EDS) techniques. The results show that the different Mn precursors play important roles in the catalytic activity. The Mn-Ce-Ti(N) catalyst synthesized by manganese nitrate precursor exhibits the best catalytic activity, while the Mn-Ce-Ti(C) and Mn-Ce-Ti(Cl) catalyst prepared by manganese acetate and manganese chloride, respectively, exhibit relatively low catalytic activity. The manganese nitrate precursor could promote the specific surface area and redox ability, enhance the amounts of Brønsted and Lewis acid sites, and enrich the surface active species such as Mn4+, Ce3+ and surface chemisorbed oxygen of the catalyst, all of which will contribute to the SCR performance. Moreover, the Mn-Ce-Ti(N) catalyst possesses highly dispersed and uniform surface active species, which will result in the optimal physicochemical properties and superior catalytic performance.
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