Abstract
Ordered mesoporous carbon (OMC) was used as support for CuOx and MnOx, and the effects of preparation method on selective catalytic reduction (SCR) of NO with NH3 were investigated. The Cu–Mn/OMC prepared by solvent evaporation-induced self-assembly method, named as self-assembly synthesis (S), exhibited higher NO conversion and N2 selectivity than the catalyst prepared by ultrasound-assisted impregnation (I) or mechanical mixing (M). The structural and surface properties of catalysts were characterized by various techniques. XRD and TEM results showed good dispersion of active phases on Cu–Mn/OMC(S). XPS analysis suggested that the surface of Cu–Mn/OMC(S) had the maximum amount of O–C=O groups and chemisorbed O. The strongest acidity and largest amount of oxidative species were further illustrated by NH3-TPD and H2-TPR profiles, which were consistent with the XPS results. Accordingly, these favorable properties may be the main reasons for the outstanding performance of Cu–Mn/OMC(S) in NH3-SCR reaction. Thus, self-assembly synthesis can be considered an effective method for the preparation of OMC–supported catalysts.
Highlights
Anthropogenic emission of NOx has raised wide concern in recent years for its contribution to environmental pollution, including photochemical smog, acid rain, ozone depletion, and haze formation (Kang et al, 2007)
An Ordered mesoporous carbon (OMC) support was investigated for comparison, which exhibited a specific surface area of 1057 m2 g–1 and a pore volume of 1.29 cm3 g–1, and both decreased after incorporation of Cu and Mn
OMC was used as support for Cu and Mn oxides in NH3-selective catalytic reduction (SCR) of NO, and the influence of preparation methods on catalytic activity was investigated in this study
Summary
Anthropogenic emission of NOx has raised wide concern in recent years for its contribution to environmental pollution, including photochemical smog, acid rain, ozone depletion, and haze formation (Kang et al, 2007). Many studies have been investigated for the low-temperature SCR catalyst, which could contribute to low energy consumption and improve economics for flue gas cleaning (Li et al, 2012). Carbonaceous materials, including activated carbon (AC), carbon nanotubes (CNTs), carbon nanofibers (CNFs), and grapheme, are usually used as low-temperature catalyst supports (Xu et al, 2008; Amanpour et al, 2013; Su et al, 2013). Compared to AC, CNTs, CNFs and grapheme, the ordered mesoporous carbon (OMC) has many advantages
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