Abstract
AbstractBACKGROUNDNOx emissions are very toxic and cause serious adverse environmental effects. NOx reduction technologies have been developed due to the harmful effects of NOx and increasingly stringent emission standards which apply in many countries. Selective catalytic reduction (SCR) is the most effective method of removing NOx from engine exhaust. The suitable active catalysts are important for providing higher NOx conversion efficiencies in the SCR system. Catalyst production methods affect catalytic activity due to change in elemental composition, morphology, dispersion of catalytic elements, and total surface area. In this study, de‐NOx performance of Ce/TiO2 and Au‐Ce/TiO2 catalysts were investigated with real exhaust gases. Tests were carried out within 200–300 °C temperature range to evaluate low temperature performance of the catalysts. Cordierite material was used as the support material and pre‐treated with hot acid solution to enhance surface area. Ce content of synthesized catalysts with impregnation method was adjusted as 4 wt% and Au content as 0.4, 0.8, and 1.6 wt%. The catalysts were characterized with Scanning Electron Microscope (SEM), Brunauer–Emmett–Teller (BET), X‐Ray Diffractometer (XRD), and Fourier transform infrared spectroscopy (FT‐IR) analysis.RESULTSMaximum NOx conversion ratios obtained at 300 °C with the Ce/TiO2, 0.4 Au‐Ce/TiO2, 0.8 Au‐Ce/TiO2, and 1.6 Au‐Ce/TiO2 catalysts were 95.1%, 92%, 92.6%, and 90.2%, respectively.CONCLUSIONSThe results showed that in general, de‐NOx effect of the Ce/TiO2 catalyst was greater than the Au doped Ce/TiO2 catalysts. Au addition adversely affected surface properties of the catalyst and therefore activity of the Au‐Ce/TiO2 catalysts decreased. © 2021 Society of Chemical Industry (SCI).
Published Version
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